Postcode · De Bilt, Utrecht

Postcode 3731: Neighbourhood West

On 1 January 2026, postcode 3731 in De Bilt (West) had 6,150 residents. 20.1% of them (1,235 people) have a migration background: they were born abroad or have at least one parent who was. That is about the same as De Bilt (21.1%) and lower than the national average (29.1%). The largest origin groups are other Europe (3.5%), other Asia (2.9%) and Indonesia (2.8%). 47.0% of residents with a migration background were born abroad themselves. Since 2022 the share has hardly changed.

Residents
6,150 on 1 January 2026
Migration background
20.1% 1,235 people
Born abroad
47.0% of those with a migration background
Change since 2022
+0.4 pp in share with a migration background

Map

Migration background, share of residents <15%, 15%–18%, 18%–25%, 25%–30%, 30%–45%, 45%–60%, ≥60%

Share of residents with a migration background in this postcode and its neighbours.

Where residents come from

Origin of residents on 1 January 2026, as a share of all residents.

Dutch origin and migration background

  • Dutch origin 79.9% 4,915
  • Migration background 20.1% 1,235

Largest origin groups

Bars show each group’s share of all residents of 3731. For comparison, the line marks De Bilt and the circle the Netherlands.

  • Other Europe Europe excluding the Netherlands, Belgium, Germany and Poland
    3.5% 215 people
    De Bilt 4.2% Netherlands 5.6%
  • Other Asia Asia excluding Indonesia and Turkey
    2.9% 180 people
    De Bilt 3.7% Netherlands 5.3%
  • Indonesia
    2.8% 170 people
    De Bilt 2.5% Netherlands 1.9%
  • Morocco
    2.6% 160 people
    De Bilt 2.9% Netherlands 2.4%
  • Germany
    2.2% 135 people
    De Bilt 1.9% Netherlands 1.9%
  • Other Americas & Oceania Americas and Oceania excluding Suriname and the Dutch Caribbean
    1.5% 95 people
    De Bilt 1.7% Netherlands 1.7%
  • Other Africa Africa excluding Morocco
    1.5% 90 people
    De Bilt 1.4% Netherlands 2.3%
  • Suriname
    0.89% 55 people
    De Bilt 0.83% Netherlands 2.0%
  • Turkey
    0.73% 45 people
    De Bilt 0.69% Netherlands 2.6%
  • Belgium
    0.57% 35 people
    De Bilt 0.55% Netherlands 0.76%
  • Dutch Caribbean Aruba, Curaçao, Sint Maarten, Bonaire, Sint Eustatius and Saba
    0.49% 30 people
    De Bilt 0.51% Netherlands 1.1%
  • Poland
    0.41% 25 people
    De Bilt 0.28% Netherlands 1.4%

First and second generation

Residents with a migration background, by whether they were born abroad themselves.

  • Born abroad (first generation) 47.0% 580
  • Born in the Netherlands (second generation) 53.0% 655

Men and women

Men
2,950
Women
3,195

Compared with all postcodes

Higher than 56% of all postcodes in the Netherlands

Trend since 1998

Share of residents with a migration background, compared with larger areas.

Measure
  • 3731
  • De Bilt
  • Netherlands
Show as table
Year 3731De BiltNetherlands
1998 13.8%12.9%16.7%
1999 14.1%13.1%17.1%
2000 14.4%13.4%17.5%
2001 14.5%13.8%18.0%
2002 14.5%14.0%18.4%
2003 14.8%14.4%18.8%
2004 15.0%14.7%19.0%
2005 15.4%14.9%19.2%
2006 15.3%15.0%19.3%
2007 15.2%15.0%19.4%
2008 15.5%15.4%19.6%
2009 15.3%15.7%19.9%
2010 14.9%15.6%20.3%
2011 15.3%16.0%20.6%
2012 15.3%16.2%20.9%
2013 15.8%16.5%21.1%
2014 16.2%16.9%21.4%
2015 16.5%17.0%21.7%
2016 16.5%16.8%22.1%
2017 16.8%17.4%22.6%
2018 17.1%17.9%23.1%
2019 17.4%18.1%23.6%
2020 17.9%18.7%24.2%
2021 17.7%19.0%24.6%
2022 19.7%20.4%26.0%
2023 20.3%21.4%27.1%
2024 20.4%22.1%27.9%
2025 20.4%21.8%28.5%
2026 20.1%21.1%29.1%

In 2022 CBS switched to a new origin classification. Up to 2021 the line shows the old “migration background” figures; the overlap years show a small break (about +0.8 points nationally).

Nearby postcodes

Largest group
3721 Zuid West 8,480 +3.0 pp Other Asia
3584 Oost 7,655 +7.2 pp Other Europe
3573 Noordoost 5,175 +6.1 pp Other Asia
3732 Oost 4,675 +1.0 pp Other Europe
3737 Groenekan 2,010 +1.3 pp Other Europe
3566 Overvecht 335 +1.7 pp Other Europe

All figures

Number of residents per origin group on 1 January. Figures up to 2021 use the old CBS classification.

Year Total residentsDutch originMigration backgroundEuropeOutside EuropeTurkeyMoroccoSurinameIndonesiaDutch CaribbeanGermanyPolandBelgiumOther EuropeOther AfricaOther AsiaOther Americas & OceaniaWestern migration backgroundNon-Western migration background
1998 5,9905,165825260565301155022015125153090405045510315
1999 5,9705,1308402655752512050220151151535100406045505330
2000 5,9055,0508502855703011055220151252030110406040530325
2001 5,8655,0158502955552511040220151252025125306550535310
2002 5,8705,0258502905602010050210201201530125357550525325
2003 5,9355,0508802905853011055215201351525115407045535350
2004 5,9755,0758952956003510555220201301525125408045540360
2005 6,0405,1109302956453511060225151301525125558560545390
2006 6,0205,1059202956253010060220251251520135558550540380
2007 5,9955,0859103105953010545210201352025130409550540370
2008 5,9855,0659253305953095452051514015251505510050555370
2009 5,9955,07092031560035105402001513020251406010045540385
2010 5,9555,06589030559535120401951511525251405010040515380
2011 5,9555,04591031060535130401852012525251355011035505405
2012 5,9655,05091530561040125351902012015351355510540510400
2013 5,9705,03094532062535130351802011515351556011550525415
2014 5,9855,01597032564035135401802011520401506512045530435
2015 6,0055,01599033565535150401802012020351606012050540455
2016 6,0205,02599532567035160501801512020351505512550530465
2017 6,0105,0001,01033067535160501751512020401505513550535475
2018 6,0154,9851,03035567535160501701512020401755514050555475
2019 6,0154,9701,04536568035165451651512025401805015055560485
2020 6,1055,0151,09037071535170501651513020251956516055565520
2021 6,1155,0301,08537571030165501651513025251956515565570515
2022 6,1204,9201,20539081540165551852014020351958018585570550
2023 6,1104,8701,24042082040175551752014525402208017595605560
2024 6,0604,8251,23543081045160551752515025302209016590––
2025 6,1054,8601,24542582050155551752513525352309517590––
2026 6,1504,9151,23540583045160551703013525352159018095––