3731 Postcode — De Bilt, Utrecht

English Nederlands

4-digit postcode 3731 covers De Bilt, Utrecht. Dutch postcodes are four digits and two letters. The four digits identify a delivery area, and it is the level Statistics Netherlands publishes against, so the figures below describe this postcode itself rather than the town around it.

Residents: 6,105
Households: 2,760
Average property value: €561,000
Owner-occupied: 70%
Average household size: 2.2
Urbanity: Strongly urban

Where 3731 is

De Bilt, Utrecht — the point recorded for this postal code. It marks the centre of the code, not its boundary.

People

Residents	6,105
Men	2,935
Women	3,170
Under 15	1,085
15 to 25	640
25 to 45	1,300
45 to 65	1,650
65 and over	1,435
Born abroad, in Europe	0%
Born abroad, outside Europe	10%

Households

Households	2,760
Average size	2.2
One-person households	38.8%1,070
Couples without children	715
One-parent families	6.9%190
Two-parent families	780

Housing

Homes	2,795
Average property value (WOZ)	€561,000
Owner-occupied	70%
Rented	30%
Housing-association homes	690
Flats and shared buildings	38.1%1,065
Built before 1945	31.3%875
Unoccupied	3.6%100

Area

Addresses per square kilometre	1,733
Urbanity	Strongly urban
Residents on unemployment, disability or income support	5.6%340

Against the national median

The tick is the national median.

Housing

Owner-occupied	70%
Rented	30%
Flats and shared buildings	38.1%
Built before 1945	31.3%
Unoccupied	3.6%

Households

One-person households	38.8%
One-parent families	6.9%
Residents on unemployment, disability or income support	5.6%

Age bands

Under 15	17.7578%
15 to 25	10.4746%
25 to 45	21.2766%
45 to 65	27.0049%
65 and over	23.4861%

Figures from Statistics Netherlands (CBS), key figures per postcode, 1 January 2025. CBS withholds figures for areas with too few residents to publish safely, so a missing value here means withheld, not zero.