Belgium is a small country carrying an outsized demographic story. It’s one of the most densely built-up nations in Western Europe, its population is quietly ageing even as it keeps growing, and the reason it keeps growing has almost nothing to do with birth rates anymore. Here’s the full picture, pulled from Statbel (the national statistical office) and the Federal Planning Bureau.
Belgium population is approximately 11.8 million people in 2026 (11,825,551 as of the last official Statbel count on 1 January 2025, growing toward roughly 11.9 million through the year). That makes it the 83rd most populous country in the world, home to about 0.14% of humanity, packed into just 30,280 km² — one of the highest population densities in Europe.
Belgium’s Population in 2026 — The Snapshot
Statbel’s official reference count put Belgium’s legal population at 11,825,551 inhabitants on 1 January 2025 — 5,995,529 women and 5,830,022 men. Mid-year 2026 estimates from the UN and Worldometer track a slightly different but consistent figure, around 11.77–11.8 million, since the two agencies use different reference dates and methodologies (legal population vs. de facto population).
Either way, the trend line is the same: Belgium grew by about 0.52%, or roughly 62,000 people, between January 2024 and January 2025 — a faster pace than the previous few years. The country now ranks as the 83rd most populous nation globally and holds roughly 1.5–1.6% of Europe’s total population.
A quick note on why you’ll see slightly different numbers depending on the source: Statbel’s “legal population” counts everyone officially registered in a Belgian municipality, while the UN’s World Population Prospects estimates a de facto resident population. Neither is wrong — they’re just measuring slightly different things, and the gap between them is usually well under 0.1%.
Population by Region — Flanders, Wallonia, and Brussels
Belgium splits into three regions, and they are not growing at the same speed or for the same reasons.
Flanders is home to roughly 6.85 million people — about 58% of the national population. It’s the Dutch-speaking north, covering the provinces of Antwerp, East Flanders, West Flanders, Flemish Brabant, and Limburg. Flanders also posted the strongest provincial growth rates in the country in 2024, led by Antwerp province at 0.75%.
Wallonia holds around 3.7 million residents, roughly 31% of the total, across the French-speaking south — Hainaut, Liège, Luxembourg, Namur, and Walloon Brabant, plus a small German-speaking community of about 78,000 people concentrated in nine municipalities near the German border. Wallonia’s provinces registered the slowest growth nationally in 2024, all still positive but under 0.4%, a legacy of the region’s post-industrial economic transition.
Brussels-Capital Region is the outlier: just 1.25 million people on only 161 km², but it’s the only one of the three regions where births still outnumber deaths. In 2024, Brussels recorded a positive natural balance of +5,330 (13,830 births versus 8,500 deaths) — a reflection of its young, highly international population — on top of a strong positive international migration balance of +19,398. Brussels did lose population to internal migration (-17,993), as residents moved out to the surrounding Flemish and Walloon commuter belt, but international arrivals more than offset that.
| Region | Population (approx.) | Share of Belgium | Dominant language |
|---|---|---|---|
| Flanders | 6.85 million | 58% | Dutch |
| Wallonia | 3.7 million | 31% | French (+ German minority) |
| Brussels-Capital | 1.25 million | 10.7% | Bilingual (French/Dutch) |
Population by Province
Belgium is organized into 10 provinces — five in Flanders, five in Wallonia — plus the Brussels-Capital Region, which is not part of any province. In 2024, Antwerp province was the fastest-growing in the country (+0.75%), followed by East Flanders (+0.69%), Flemish Brabant (+0.65%), Limburg (+0.54%), and West Flanders (+0.42%) — a clean sweep for Flanders’ five provinces at the top of the growth table. The five slowest-growing provinces were all Walloon: Hainaut (+0.39%), Liège (+0.35%), Walloon Brabant (+0.30%), Luxembourg (+0.29%), and Namur (+0.29%). Notably, every single province still grew — none shrank in 2024.
The Largest Cities in Belgium
City population figures for Belgium can be confusing because Brussels isn’t actually a single municipality — it’s a patchwork of 19 communes, so “Brussels City” alone (around 185,000) looks smaller than Antwerp on a strict commune-by-commune ranking, even though the wider Brussels-Capital Region (1.25 million) is by far the country’s largest urban area.
| Rank (by commune) | City | Approximate population | Region |
|---|---|---|---|
| 1 | Antwerp | ~536,000 | Flanders |
| 2 | Ghent | ~265,000 | Flanders |
| 3 | Charleroi | ~200,000 | Wallonia |
| 4 | Liège | ~195,000 | Wallonia |
| 5 | Brussels (city proper) | ~185,000 | Brussels-Capital |
| 6 | Bruges | ~120,000 | Flanders |
| 7 | Namur | ~110,000 | Wallonia |
| 8 | Leuven | ~105,000 | Flanders |
| 9 | Mons | ~95,000 | Wallonia |
| 10 | Mechelen | ~87,000 | Flanders |
Antwerp is Belgium’s biggest single municipality and one of Europe’s largest ports; its metro area runs to roughly 1.2 million, making Greater Antwerp the country’s second-largest urban agglomeration behind Greater Brussels. Ghent, with one of the largest car-free medieval centers in Europe, and Bruges, a UNESCO World Heritage city, round out Flanders’ cultural heavyweights. Charleroi and Liège, meanwhile, grew fast during the 19th-century coal and steel boom and are still working through the demographic and economic aftermath of deindustrialization.
Population Density and Urbanization
Belgium’s population density sits at roughly 389 people per km² nationally — among the highest in the European Union — but that average hides an enormous internal range. Brussels-Capital crosses 7,000+ people per km², Flanders averages under 500, and rural Wallonia drops to around 200–275 people per km². Essentially the entire country is classified as urban: Worldometer puts Belgium’s urban population share at 99%, among the most urbanized populations on Earth, right alongside neighbors like the Netherlands.
Age Structure, Median Age, and Life Expectancy
Belgium’s median age is around 42–43 years, well above the global average of roughly 31. The population skews older: about 1 in 5 residents is 65 or over, while the working-age (18–66) group is shrinking as a share of the total. In 2024, there were 28 people aged 67+ for every 100 people aged 18–66 — a ratio the Federal Planning Bureau expects to climb to 37 by 2040 and 43 by 2070.
Life expectancy at birth is roughly 82.3–82.9 years overall — about 80.2 years for men and 84.3 years for women — and it’s still rising. The Federal Planning Bureau’s longer-range outlook projects life expectancy will reach 90 years by 2080, with the gap between men and women continuing to narrow.
Quick takeaway: Belgium isn’t just growing — it’s greying. The number of people aged 67+ is rising far faster than the working-age population, which is the single biggest structural pressure on pensions and healthcare spending over the next few decades.
Births, Deaths, and the Natural Balance
This is the part most population-statistics pages skip, and it’s arguably the most important trend in Belgian demographics right now: Belgium’s natural population balance turned negative in the early 2020s. In 2024, the country recorded more deaths than births — a natural balance of -3,879 — driven by a sustained decline in the number of births combined with a rising number of deaths as the population ages.
The total fertility rate has fallen to roughly 1.47–1.55 children per woman, well below the 2.1 replacement level. The Federal Planning Bureau’s central projection has the natural balance staying negative for decades, and not turning positive again before 2080.
Migration — Why Belgium’s Population Keeps Growing
If births no longer outpace deaths, why is Belgium’s population still rising? The answer is migration, and it isn’t close: in 2024, Belgium’s positive international migration balance was +66,044, more than enough to offset the natural population decline and push total growth to +61,901 people for the year.
The Federal Planning Bureau is explicit that this pattern will only intensify. From the late 2030s onward, international migration is expected to become the sole driver of Belgium’s population growth, as the natural balance stays permanently negative. Under current projections, Belgium’s population is forecast to grow by roughly 30,000 people a year on average, reaching about 12.9 million by 2070 and surpassing 13 million by 2080 — entirely on the strength of net migration.
Nationality, Languages, and Communities
Belgium runs a federal structure with three overlapping layers — Regions, Communities, and Provinces — which trips up a lot of population write-ups. The Flemish Community (Dutch-speaking) numbers around 6.5 million, including Flanders plus the Dutch-speaking share of Brussels. The French Community numbers around 4.5 million, covering Wallonia’s French speakers plus Brussels’ French-speaking majority. The German-speaking Community, Belgium’s smallest, numbers about 78,000 people in nine Liège-province municipalities near the German border.
Roughly 17% of Belgium’s resident population was born abroad — a figure that approaches 40% in Brussels specifically, reflecting the city’s role as home to the EU institutions, NATO, and generations of migration from Morocco, Turkey, and elsewhere, many of whose descendants are now in their second or third generation in the country.
Population Growth: 1950 to Today
Belgium’s population has grown steadily since the mid-20th century, though the pace has slowed sharply. The country had roughly 9.1 million people in 1960; by 2016 that had risen to about 11.33 million; today it sits near 11.8 million. Peak annual growth came in 1959, at around 0.72%, and has been on a long-run downward slide since — with the composition of that growth flipping entirely from natural increase to migration along the way.
Future Projections — Belgium’s Population Through 2070 and Beyond
The Federal Planning Bureau, working with Statbel, publishes Belgium’s official long-range demographic outlook, and the latest edition (Population Projections 2025–2080) points to a population exceeding 13 million by 2080. Within that:
- Flanders is projected to reach about 8.0 million by 2070 (up from 6.8 million in 2024)
- Wallonia and Brussels are expected to stay comparatively stable, around 3.7 million and 1.2 million respectively
- The dependency ratio keeps climbing as the elderly population grows faster than the working-age base
- Migration becomes the only source of population growth from roughly 2038 onward, once the natural balance goes permanently negative
How Belgium Compares to Its Neighbors
| Country | Approx. population (2025–26) | Population density |
|---|---|---|
| Belgium | ~11.8 million | ~389/km² |
| Netherlands | ~18 million | ~519/km² |
| Luxembourg | ~0.68 million | ~245/km² |
| France | ~68 million | ~119/km² |
| Germany | ~84 million | ~236/km² |
Belgium sits in the middle of its immediate neighborhood: denser than France or Germany, but noticeably less dense than the Netherlands, and far more populous than Luxembourg despite the three countries sharing the Benelux label.
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FAQ
What is Belgium’s population in 2026?
Belgium’s population is approximately 11.8 million people in 2026. Statbel’s most recent official count recorded 11,825,551 legal residents on 1 January 2025, and the population has continued rising since.
Is Belgium’s population growing or shrinking?
Growing, but not from births. Belgium recorded more deaths than births in 2024 (a negative natural balance), and all of the country’s net growth came from international migration, which more than offset that decline.
What percentage of Belgium’s population lives in Brussels?
About 10.7% — roughly 1.25 million of Belgium’s 11.8 million people live in the Brussels-Capital Region, even though it covers just 161 km².
What is Belgium’s population density?
Around 389 people per km² nationally, one of the highest in the European Union, though it ranges from over 7,000/km² in Brussels to roughly 200–275/km² in rural Wallonia.
What is Belgium’s median age?
Roughly 42–43 years, well above the global median of about 31, reflecting a population that is ageing faster than it is being replaced by births.
Will Belgium’s population keep growing?
Yes, according to the Federal Planning Bureau’s official projections, which forecast around 12.9 million people by 2070 and over 13 million by 2080 — growth driven entirely by migration from the late 2030s onward.
What is the largest city in Belgium?
By region, Brussels-Capital is largest (1.25 million). By single municipality, Antwerp is largest, with roughly 536,000 residents.
What percentage of Belgium’s population was born abroad?
About 17% nationally, rising to close to 40% in Brussels.
