Diest: map, population and postcodes

About Diest

Diest is a municipality in the province of Flemish Brabant in Flanders, Belgium. On 1 January 2026 it had 25,196 inhabitants on an area of 58.7 km², a population density of 429 inhabitants per km². That is lower than the average of 571 per km² in Flemish Brabant and close to the Belgian average of 387 per km².

By population, Diest ranks 123rd of Belgium’s 565 municipalities and 14th of the 63 municipalities in Flemish Brabant. By area it ranks 184th in Belgium.

The official language is Dutch.

Population of Diest since 2016

Population on 1 January, 2016–2026. The bars start above zero to make the change visible. Source: Statbel.

Between 1 January 2016 and 1 January 2026 the population of Diest grew by 1,658 inhabitants (+7.0%), from 23,538 to 25,196. In the last year it changed by +55.

For population growth since 2016, Diest ranks 151st of 565. Over the same period the province of Flemish Brabant changed by +7.9% and Belgium by +5.3%.

Postcode	Places
3290	Deurne, Diest, Schaffen, Webbekom
3293	Kaggevinne
3294	Molenstede

Postcode

Places

3290

Deurne, Diest, Schaffen, Webbekom

3293

Kaggevinne

3294

Molenstede

To	km	miles
Hasselt	21	13
Leuven	29	18
Mechelen	43	27
Brussels	51	31
Liège	55	34
Antwerp	56	35
Namur	62	38
Charleroi	78	49
Ghent	94	59
Mons	98	61
Kortrijk	129	80
Bruges	132	82
Ostend	152	94
Arlon	156	97

miles