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Arr. Aalst: population, economy and official figures

Arr. Aalst is a arrondissement in Flanders, Belgium. Arr. Aalst had 307,873 residents on 1 January 2025, 4.5% of Flanders and 2.59% of Belgium; 13th largest of 44 arrondissements in Belgium.

Population
307,873
2025
People per km²
648.1
2024
Median age
43.9
2025
Aged 65+
21.4%
2025
Area (km²)
473
2026

In depth

Is the population of Arr. Aalst growing?

That is 8.4% more people than in 2015 (283,885).

Source: Eurostat · saved copy

How densely populated is Arr. Aalst?

There were 648.1 people per square kilometre in 2024.

Source: Eurostat · saved copy

What is the median age in Arr. Aalst?

The median age was 43.9 years in 2025, against 42.1 for Belgium; 16th highest of 44 arrondissements in Belgium.

Source: Eurostat · saved copy

How old is the population of Arr. Aalst?

21.4% of residents were 65 or older and 15.9% were under 15 in 2025.

Source: Eurostat · saved copy

How many births and deaths are there in Arr. Aalst?

In 2024 there were 2,749 live births and 3,086 deaths, a natural decrease of 337.

Source: Eurostat · saved copy

How big is Arr. Aalst?

It covers 473 km².

Source: Eurostat · saved copy

Are people moving to Arr. Aalst?

The net migration rate was +9.8 per 1,000 residents in 2024, while births minus deaths gave a natural change of -1.1 per 1,000.

Source: Eurostat · saved copy

Figures come from Belgium's own official statistics and from Eurostat's regional statistics for NUTS 3 areas. Comparisons with the EU average use purchasing power standards (PPS), which adjust for price differences.

Other arrondissements in Flanders

Up a level: Flanders · all regions of Belgium · how local power works in Belgium

Sources

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