3121 Postcode — Schiedam, South Holland

English Nederlands

4-digit postcode 3121 covers Schiedam, South Holland. 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: 3,475
Households: 1,550
Average property value: €425,000
Owner-occupied: 70%
Average household size: 2.2
Urbanity: Strongly urban

Where 3121 is

Schiedam, South Holland — the point recorded for this postal code. It marks the centre of the code, not its boundary.

People

Residents	3,475
Men	1,655
Women	1,820
Under 15	560
15 to 25	335
25 to 45	680
45 to 65	950
65 and over	955
Born abroad, in Europe	0%
Born abroad, outside Europe	10%

Households

Households	1,550
Average size	2.2
One-person households	32.9%510
Couples without children	490
One-parent families	6.8%105
Two-parent families	450

Housing

Homes	1,565
Average property value (WOZ)	€425,000
Owner-occupied	70%
Rented	30%
Housing-association homes	425
Flats and shared buildings	19.5%305
Built before 1945	5.4%85
Unoccupied	2.9%45

Area

Addresses per square kilometre	2,432
Urbanity	Strongly urban
Residents on unemployment, disability or income support	4.7%165

Against the national median

The tick is the national median.

Housing

Owner-occupied	70%
Rented	30%
Flats and shared buildings	19.5%
Built before 1945	5.4%
Unoccupied	2.9%

Households

One-person households	32.9%
One-parent families	6.8%
Residents on unemployment, disability or income support	4.7%

Age bands

Under 15	16.092%
15 to 25	9.62644%
25 to 45	19.5402%
45 to 65	27.2989%
65 and over	27.4425%

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.