Coding Classes in Zuid-Holland

Course picks for Zuid-Holland

Four courses for a province of universities, greenhouses and islands

A groep 4 child in Katwijk, a teenager in Zoetermeer with a database to build, a Delft student who wants a real front end, and a Westland grower's daughter who wants the app that runs the glasshouse: four doors, one province.

Ages 6 to 10

Problem Solving and Computational Thinking for Kids

Decomposition, patterns and the first real algorithm, in English, before any syntax gets in the way.

See the syllabus

Ages 13 to 17

MySQL for Teens

SQL from the first query to a real app, for the teenager who has noticed that every website is a database wearing a costume.

See the syllabus

Ages 14 to 18

React Course for Teens

JavaScript to real React apps, for the Leiden or Delft teenager who wants the thing to work on a phone by the weekend.

See the syllabus

College and adult

Flutter Course

Dart to cross-platform apps, for the student at Delft or The Hague who wants one codebase that runs on both stores.

See the syllabus

Browse the course atlas for more than one hundred options and use the coding roadmap to check prerequisites.

The four we are known for

Python, AI, vibe coding and agentic coding

These run underneath everything above. Every one is live and online, placed by ability rather than by age, and the first class is free.

Vibe codingAges 13 to 17

Vibe Coding for Teens

Python, web and AI projects where the learner still owns the thinking.

See the syllabus

Python and AICollege and adult

Python Automation Course

Automate the work you already do, then let AI carry part of it.

See the syllabus

AI and MLAges 14 to 18

AI and Machine Learning for Teens

Train a model, read what it learned, and be able to say why it is wrong.

See the syllabus

Agentic codingProfessionals

Codex & Claude Code

Run AI coding agents on real work without losing control of the codebase.

See the syllabus

Zuid-Holland today

The most people, the most schools, and the least room

Statistics Netherlands counted 3,882,708 residents on 1 January 2026 in 1,815,974 households, 600,471 of them under fifteen and 483,756 aged fifteen to twenty-five, on about 2,698 square kilometres of land inside 3,308 of territory. That is 1,432 people to the square kilometre, and no other province comes close.

Two cities with pages, 48 towns without

Rotterdam at 673,804 and The Hague at 569,468 together hold 32.0 percent of the province and have pages of their own. The remaining 2,639,436 people live in 48 municipalities, and this page is theirs: it names every one with its population so that a family can find its own town.

The schools

1,110 primary establishments teach 326,108 pupils and 370 secondary establishments 212,091, the largest school system of any province. The Hague alone runs five school systems inside one municipality; the rest of the province runs the Dutch one, with an international school in Delft and another in Leiden's catchment.

Grown by a sixth since 1995

The province held 3.325 million people in 1995 and 3.883 million on 1 January 2026, a rise of 17 percent over thirty-one years. Most of the growth went into the ring of towns between the two cities: Zoetermeer, Pijnacker-Nootdorp, Lansingerland, Westland.

Capital in one city, size in another

The Hague is the provincial capital as well as the seat of national government; Rotterdam is the larger city by more than a hundred thousand. Both were in the province of Holland until 1840, when it was split into a northern and a southern half, and the two halves have been arguing gently about which is the real one ever since.

The spread

From the bulb fields to the islands: every one of the 50 municipalities, by population

Six regions, each with its municipalities and their 1 January 2026 population, so that a family in Hillegom or Hardinxveld-Giessendam is on this page by name.

Leiden and the Duin- en Bollenstreek

Leiden 130,328, the university city, with its own page; Katwijk 67,149; Noordwijk 46,453; Teylingen 38,739; Kaag en Braassem 29,467; Leiderdorp 27,973; Oegstgeest 26,095; Voorschoten 25,975; Lisse 23,842; Hillegom 23,078; Zoeterwoude 10,355. The flower fields are between the towns, and the international school families of the Leiden ring are among the most concentrated in the country.

Haaglanden: the ring around the capital

Zoetermeer 130,836, third in the province by a margin of 508 over Leiden, with its own page; Westland 118,874, the glasshouse municipality, with its own page; Delft 110,089, the technical university, with its own page; Leidschendam-Voorburg 78,916; Lansingerland 66,633; Rijswijk 61,857; Pijnacker-Nootdorp 58,741; Wassenaar 27,975; Midden-Delfland 19,355.

Rijnmond: the ring around the port

Nissewaard 89,112; Schiedam 81,931; Vlaardingen 77,480; Voorne aan Zee 75,012; Capelle aan den IJssel 69,698; Barendrecht 48,701; Ridderkerk 48,084; Maassluis 37,125; Krimpen aan den IJssel 29,864; Albrandswaard 26,559. Ten municipalities that share Rotterdam's metro, its port and its river, and not its page.

The Drechtsteden and the Alblasserwaard

Dordrecht 122,991, fifth in the province, with its own page; Molenlanden 45,625, with the Kinderdijk mills; Zwijndrecht 44,819; Gorinchem 39,060; Hendrik-Ido-Ambacht 33,100; Papendrecht 32,267; Sliedrecht 26,531; Alblasserdam 20,250; Hardinxveld-Giessendam 19,402. Shipyards, rivers and a city older than either of the big two.

The Groene Hart

Alphen aan den Rijn 117,284, seventh in the province, with its own page; Gouda 77,818; Krimpenerwaard 57,898; Zuidplas 49,291; Bodegraven-Reeuwijk 37,291; Waddinxveen 35,542; Nieuwkoop 29,728. The open middle of the Randstad, whose whole planning purpose is to stay open.

The islands

Hoeksche Waard 91,445 and Goeree-Overflakkee 52,798, the two southern islands, each a single municipality since the mergers, each a forty-minute drive from a centre and each the plainest case in the province for a class that comes to the house.

Fifty municipalities, every one named. The city pages in this series are close-up; this page is the map, and the map is where a Zoeterwoude family finds itself.

Verified local facts

Where every Zuid-Holland number on this page came from

The offices and dates behind the figures, including the three population counts for a region that has none.

The province, counted

Statistics Netherlands, provisional, 1 January 2026: 3,882,708 residents in 50 municipalities; 1,815,974 households; 600,471 under fifteen; 483,756 aged fifteen to twenty-five; 1,110 primary establishments with 326,108 pupils and 370 secondary with 212,091; land 269,840 hectares, territory 330,786; density 1,432 per square kilometre; 3.325 million residents in 1995.

The list

All 50 municipalities with their 1 January 2026 populations from the municipal registers, from Rotterdam at 673,804 to Zoeterwoude at 10,355. The fifty figures sum to the provincial total exactly, which is the first thing checked in class.

The capital and the year

The Hague is the provincial capital and Rotterdam the largest city, by the province's own account; the province dates from the 1840 division of Holland; land 2,700.07 and water 607.79 square kilometres by that account, against 2,698.40 of land by the national count, both kept.

The Randstad, three ways

From the English encyclopaedia entry: the conurbation, 8,403,915 people on 11,372.15 square kilometres on 1 January 2021; the urban area, 7,146,249 on 6,296.91; the four provinces together, 8,589,872 in 2023, of which Zuid-Holland 3,804,906. The same entry states that the Randstad's borders have never been officially specified and that it is not an official statistical area.

The four cities

Amsterdam 941,927, Rotterdam 673,804, The Hague 569,468 and Utrecht 378,121 on 1 January 2026, together 2,563,320: the narrowest reading of the word Randstad anyone uses, and three and a third times smaller than the widest.

The holiday region

Zuid-Holland takes its school holidays with regio Midden, alongside Utrecht and the northern half of Gelderland, by the Rijksoverheid's regional division. The summer break therefore falls in a different fortnight from Noord-Holland's and from Noord-Brabant's in most years.

None of the 50 municipalities, the province or any school inside it has any connection to Modern Age Coders, and this page claims none; they are listed because a page that says it serves a province ought to be able to name it.

Signature project

How many people live in the Randstad? Build the program that shows the question has no answer until someone draws a line

Three published figures for one word, a province that is the biggest piece of all three, and a table in which the population of a place changes by six million without anyone moving house.

1. Collect the definitions

The learner gathers every published reading of the Randstad: the four cities alone, the urban area, the conurbation, the four provinces. Each comes with a population, an area and a year, and none comes with an official boundary, because the encyclopaedia entry says plainly that none has ever been specified.

2. Write the aggregator

A function that takes a set of municipalities and sums their registered populations. Fed the four cities it returns 2,563,320. Fed the whole of the four provinces it returns 8,589,872 for 2023. Fed the conurbation as the encyclopaedia draws it, 8,403,915 for 2021. The code is the same every time; only the list of members changes.

3. Read the spread

Between the narrowest and the widest reading the figure grows by a factor of 3.35. The density moves the other way: 1,135 per square kilometre for the urban area, 739 for the conurbation, lower still for four whole provinces with their lakes and polders. Zuid-Holland is 44.3 percent of the widest figure and none of the narrowest except its two cities.

One word, four published readings: the Randstad by definition
Definition	Population	Area	Year	Density
The four cities (Amsterdam, Rotterdam, The Hague, Utrecht)	2,563,320	the four municipalities	2026	not comparable
Urban area	7,146,249	6,296.91 km2	2021	1,135 per km2
Conurbation	8,403,915	11,372.15 km2 (8,261.98 land)	2021	739 per km2
Four provinces together	8,589,872	all of NH, ZH, Utrecht, Flevoland	2023	lower still
Official statistical area	none	none	never specified	none

A place with no boundary has no population, only candidates

Every count of people is a count inside a line, and where nobody has drawn the line every count is somebody's proposal. The Randstad is real in every conversation and absent from every register, which is why a sentence beginning "the Randstad has" should be followed by "according to" or should not be written. A learner who has fed the same aggregator four different member lists will ask for the boundary before believing any regional figure again: a metro area, a catchment, a market, a Greater anything. The table was computed before this paragraph was written; the four-city sum is arithmetic on the 2026 registers and the other three are quoted as published.

Reliable pipeline

Five habits for any figure that belongs to a region rather than a register

Greater London, the Bay Area, the Ruhr, a sales territory, a school catchment: the same trap sits under every named area that nobody legally drew. Practised first on the region this province is the largest piece of.

When the place is a word and not a line
Stage	Rule	What it prevents	What it gives you
Ask for the boundary	Before accepting a regional number, ask whose line it sits inside	Eight million and seven million quoted as if they measured the same thing	A figure with an owner
Keep the member list	Store the region as a list of official units, never as a name	A total nobody can reproduce	A sum anyone can rerun
Date the members	Municipalities merge; a list from 2010 is not a list from 2026	A boundary that quietly moved with the mergers	Comparable years
Report the spread	Give the narrowest and the widest reading, not the middle	A false precision of one number	Honest uncertainty
Prefer the register	When an official unit exists, sum those, and say the region is a label	The Randstad presented as a statistical area	Numbers that match the map

For younger learners

Toy houses on a table and a loop of string. The child counts the houses inside the loop, then somebody moves the string and they count again. The houses never moved; the number did. Ten minutes and no screen, and the sentence is theirs: it depends where you put the string.

For teenagers

The aggregator in Python over the 50 municipalities of the province and their neighbours, fed the four readings in turn, printing population, area and density for each. Then the harder question: propose a boundary and defend it in three sentences.

For adults

The same program on a sales region, a hospital catchment or a market-size estimate from work, where the total is quoted weekly and the member list is in a spreadsheet nobody has opened since it was made. If a real one from work is shareable, bring it.

The provincial totals, the 50 municipal populations, the areas, the 1995 figure and the three Randstad readings are published by the offices and the encyclopaedia entry named in the sentences that use them. The four-city sum and the density figures are arithmetic on those published numbers, and nothing on this page reports a Zuid-Holland measurement that no office has published.

Learning ladder

From a loop of string to an aggregator that asks for its boundary

The starting rung comes out of the free lesson, not out of the postcode.

Ages 6 to 10

Where the string goes

Children discover that a count depends on the loop, not on the houses.

Coding for Kids Problem Solving and Computational Thinking for Kids

Ages 11 to 13

A sum over a list

Learners write a function that totals whatever list it is given and feed it two different lists.

Maths Through Coding Python and AI for Kids

Ages 14 to 18

Four readings, one word

Teenagers build the aggregator, reproduce the published figures and propose a boundary.

Python for Teens MySQL for Teens

Ages 18 to 67

Regions at work

Adults rebuild a territory total from its member list and find the line nobody drew.

Data Analysis Course MySQL Course

Coding and AI

The AI knows the Randstad has eight million people. Why should a child in Gouda learn to count them?

Because the assistant knows one of four answers, and it will give it without saying which line it used.

Ask a tool how many people live in the Randstad and it answers instantly, usually with a figure near eight million and never with the sentence that matters: the borders have never been officially specified. The number is not invented; it is one published reading chosen for you, and the choosing is invisible. A person who has built the aggregator and fed it four member lists knows to ask which list. That is not a fact the model supplies. It is a habit the person brought.

That habit is what the class trains, and it is why the code is still written by the learner rather than requested: not the loop, which the tools now write, but the reflex of asking for the boundary before believing a regional total. A thirteen-year-old in Alphen who has done it once with the Randstad will do it with a market-size slide at twenty-three and with a catchment figure in a council meeting at forty, and will be the one in the room saying: inside what line. The tools will have changed by then. The question will not.

So for a Zuid-Holland parent the argument for coding in 2026 is not that the child will write aggregators for a living. It is that knowing a total is only as real as its member list is a skill, that it transfers to every named region and every named market, and nobody has yet found a way to teach it that does not involve the learner building the sum and then moving the string. The longer argument is in is coding still worth learning now that AI can write it.

Delivery

Live classes for a province where the distances are short and the queues are long

Nowhere in Zuid-Holland is far from a city, and everywhere in Zuid-Holland is a long way from one at half past four. A class that arrives at the kitchen table in Naaldwijk or Sliedrecht asks nothing of the A4, the A13 or the A20.

No motorway between the child and the teacher

The lesson happens at home in Katwijk, Zoetermeer or Oud-Beijerland at a fixed hour, and the ring roads are somebody else's problem.

Taught in English; the school's Dutch stays Dutch

Groep, havo, vwo, profielkeuze, MYP and Key Stage appear exactly as the family meets them at school, inside lessons otherwise held in English, the language the province's international households have in common.

An hour that costs nothing and settles something

One task at the right level, then a course name and a starting rung, with no card asked for to set it up.

Grouped by what they can do

Ability and goal decide the group. Island, glasshouse town or university city do not.

Two lessons a week on regio Midden's calendar

Zuid-Holland takes its school holidays with regio Midden. The summer weeks are agreed before the slot is fixed, and they differ from Noord-Holland's in most years.

Only one of the two clocks moves

India's stays put while the Dutch one jumps twice a year, so a Zuid-Holland afternoon trails the teacher's evening by four and a half hours in winter and three and a half in summer. Late afternoon, early evening and the weekend are the hours that fit both.

The islands and the glasshouses

Goeree-Overflakkee and the Hoeksche Waard are each one municipality and each a real drive from anywhere; Westland is a town made of greenhouses that runs on a schedule the sun sets. In all three a weekly class that comes to the house is not a convenience but the only version that survives a season.

Fees

Two prices for fifty municipalities, and a free hour before either

The full tariff, printed before anyone asks for a number.

First classUSD 0

A complete lesson with a real task, a level and a named next course.

Group tuitionUSD 100

Per month, normally eight lessons, five to ten learners placed by ability.

Private tuitionUSD 150

Per month, normally eight lessons, one learner with one teacher.

The international tariff is a single dollar figure with no euro version, and Wassenaar pays what Sliedrecht pays. The free lesson comes first and fixes the course and the hour; payment follows on WhatsApp. Pauses, plan changes and missed lessons: see the pricing page.

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Reviews

Reviews, reproduced as written

Rated 4.9 across 547 Google reviews. These are real reviews, reproduced as written.

★★★★★

"The one step solution for my son. Modern Age Coders make learning coding so simple that kids love it. The teachers explain complex concepts clearly with practical exercises and interactive content."

Ria Mukherjee

Parent

★★★★★

"Modern Age Coders has been a game-changer for me. I struggled to grasp IT concepts and coding before joining, but their classes transformed everything. I can now confidently write complex programs with ease."

Samriddha Mondal

Student

★★★★★

"One of the most wonderful education centres out there. Education is not limited to school syllabus but focuses on skill development."

Vansh Agarwal

Student

★★★★★

"My child Dhairya is really enjoying the Modern Age Coders classes. This is his first online class and he eagerly looks forward to it. I can already see his improvement, and the teachers are very cooperative."

Sonam Oswal

Parent of Dhairya

★★★★★

"Modern Age Coders have wonderful teachers who teach in a clear, easy and practical way. The teacher boosts students' confidence and inspires them to learn without hesitation."

Sonu Goyal

Parent

★★★★★

"I highly recommend this computer coding class! The teachers are incredibly knowledgeable and passionate about coding."

Ritu Kedia

Parent

Free placement class

Send the level, and name the town if you want to

Expect an opening task of toy houses and a loop of string, a Python aggregator fed four member lists, or a regional total from work whose member list nobody has opened in years.

FAQ

Zuid-Holland coding class questions

The province, its towns, the Randstad, the teaching and the terms.

How many people live in the Randstad?

It depends entirely on where the line is drawn, and nobody official has drawn it. The published readings run from 2,563,320 for the four cities alone in 2026, through 7,146,249 for the urban area and 8,403,915 for the conurbation in 2021, to 8,589,872 for the four provinces together in 2023. The encyclopaedia entry says the borders have never been officially specified. Reproducing all four from one program is the project on this page.

Which Zuid-Holland towns get their own page, and which are covered here?

Rotterdam and The Hague have pages already. Leiden, Delft, Zoetermeer, Dordrecht, Westland, Alphen aan den Rijn, Gouda, Schiedam, Vlaardingen, Leidschendam-Voorburg, Nissewaard, Capelle, Wassenaar, Voorschoten, Oegstgeest and Rijswijk follow in this series. Every other municipality appears above with its population, and the class a family books from Hillegom is the class a family books from Rotterdam.

Is Zuid-Holland really the densest province?

Yes, at 1,432 people per square kilometre of land on 1 January 2026, on about 2,698 square kilometres of land for 3,882,708 people. Noord-Holland is next, and the gap is large. It is also the most populous province and the one with the most schools: 1,110 primary and 370 secondary establishments.

We live on Goeree-Overflakkee or in the Hoeksche Waard. Does that change anything?

Nothing about the class, and it strengthens the case for it. Each island is one municipality, 52,798 and 91,445 people respectively, and each is a real drive from any centre. A child in Middelharnis sits in the identical group at the identical hour as a child in Delft, and the Haringvliet bridge is not part of the arrangement.

Is the teaching in English or Dutch?

In English. The Dutch words a school uses, groep through profielkeuze, are used unchanged. We have no Dutch-language classes.

What time are classes for a family in Zuid-Holland?

India keeps one time all year and the Netherlands keeps two, which puts a Zuid-Holland afternoon four and a half hours behind the teacher in winter and three and a half in summer. Late afternoon, early evening and the weekend suit both sides, and the hour a family keeps is settled in the free lesson.

What happens in the free lesson?

We find what the learner can do and set one task there. A child counts toy houses inside a loop of string that then moves. A teenager writes the aggregator and feeds it four Randstad readings. An adult brings a regional total from work. It finishes with a named course, a starting level, an agreed hour each week and the dollar fee stated aloud, and nobody has paid for anything.

Is there a Modern Age Coders classroom anywhere in Zuid-Holland?

No, and none is claimed in The Hague, in Rotterdam or anywhere in the Netherlands. Lessons are live online and need a laptop or desktop, working audio, a current browser and a stable connection. The telephone number on this page is Indian and is described as such.

What do Zuid-Holland coding classes cost?

The first lesson is free. Group tuition is USD 100 a month for two live lessons a week, normally eight in the month, in a group of five to ten. Private tuition is USD 150 a month, one learner with one teacher at the same frequency. Course, format, recurring time and availability are confirmed before payment.

How many learners are in a Zuid-Holland group?

Between five and ten, matched on level, pace and goal rather than on age, school or municipality. Private tuition is one learner and one teacher. If no group at the right level is running, the family can take private tuition or wait for the next one to form.

Explore the Netherlands

Down to the two cities, across to the neighbours, up to the country

Inside this province, Rotterdam hands off to eight gebieden and The Hague to eight stadsdelen. The neighbouring province with a page is Noord-Holland, and the nearest city pages across the line are Utrecht and Amsterdam. The country page, the Netherlands coding hub, is the parent of every page here; for model-building rather than programming, start at AI and machine learning classes in the Netherlands or the AI and Python Academy.

Book the free class Close with WhatsApp

Four courses for a province of universities, greenhouses and islands

Problem Solving and Computational Thinking for Kids

MySQL for Teens

React Course for Teens

Flutter Course

Python, AI, vibe coding and agentic coding

Vibe Coding for Teens

Python Automation Course

AI and Machine Learning for Teens

Codex & Claude Code

The most people, the most schools, and the least room

Two cities with pages, 48 towns without

The schools

Grown by a sixth since 1995

From the bulb fields to the islands: every one of the 50 municipalities, by population

Leiden and the Duin- en Bollenstreek

Haaglanden: the ring around the capital

Rijnmond: the ring around the port

The Drechtsteden and the Alblasserwaard

The Groene Hart

The islands

Where every Zuid-Holland number on this page came from

The province, counted

The list

The capital and the year

The Randstad, three ways

The four cities

The holiday region

How many people live in the Randstad? Build the program that shows the question has no answer until someone draws a line

1. Collect the definitions

2. Write the aggregator

3. Read the spread

A place with no boundary has no population, only candidates

Five habits for any figure that belongs to a region rather than a register

For younger learners

For teenagers

For adults

From a loop of string to an aggregator that asks for its boundary

Where the string goes

A sum over a list

Four readings, one word

Regions at work

The AI knows the Randstad has eight million people. Why should a child in Gouda learn to count them?

Live classes for a province where the distances are short and the queues are long

No motorway between the child and the teacher

Taught in English; the school's Dutch stays Dutch

An hour that costs nothing and settles something

Grouped by what they can do

Two lessons a week on regio Midden's calendar

Only one of the two clocks moves

Two prices for fifty municipalities, and a free hour before either

Reviews, reproduced as written

Send the level, and name the town if you want to

Zuid-Holland coding class questions

How many people live in the Randstad?

Which Zuid-Holland towns get their own page, and which are covered here?

Is Zuid-Holland really the densest province?

We live on Goeree-Overflakkee or in the Hoeksche Waard. Does that change anything?

Is the teaching in English or Dutch?

What time are classes for a family in Zuid-Holland?

What happens in the free lesson?

Is there a Modern Age Coders classroom anywhere in Zuid-Holland?

What do Zuid-Holland coding classes cost?

How many learners are in a Zuid-Holland group?

Down to the two cities, across to the neighbours, up to the country

Keep exploring Modern Age Coders

Coding classes in nearby places

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