Zemst
The foreign population count was 875 at the start of 2026. For Zemst, the unemployment rate was 2.62% at the start of 2011. The population of Zemst, in Belgium, was 23,367 at the start of 2026. Gigabit broadband availability was 97.5% in June 2025.
Lower unemployment than 97% of Belgian cities that publish it and dirtier air than 63% of Belgian cities that publish it.
Who Zemst may suit
Relative profile scores use comparable published values. They are a decision aid, not a personal recommendation.
Population and city profile
The city covered 43.2 km² in 2025. Population density was 540.5 people per km² in 2026.
Derived from the published population and foreign-resident counts.
| Metric | Value | Verified | Source |
|---|---|---|---|
| City area | 43.2284 km2 | 2026-07-15Aging | Official sourceOfficial cadastral total area by municipality; 2025 superficie totale (ha), converted to km2. Source-backed value |
| Foreign residents | 875 people | 2026-07-15Fresh | Official sourceOfficial population by nationality at municipality grain; foreign population is TOTAL minus Belgique in the TOTAL row. Source-backed value |
| Population density | 540.548 people/km² | 2026-07-15Fresh | Official sourceOfficial resident population by Belgian municipality on 1 January 2026; Total column. Source-backed value |
| Population | 23,367 people | 2026-07-14Fresh | Official sourceBelgium official denominator source Source-backed value |
Work and income
Published unemployment rates for cities in the same country.
| Metric | Value | Verified | Source |
|---|---|---|---|
| Gigabit broadband availability | 97.5109 % | 2026-07-15Aging | Official sourceBIPT/IBPT fixed broadband Atlas municipality row: H_rate_1000 is the share of households with access to fixed broadband at a maximum attainable speed of at least 1,000 Mbps; availability, not subscribed plan or measured speed. H_1000 is the covered-household count and total_households is the denominator. Source-backed value |
| Unemployment rate | 2.62 %country median 5.8% — 54% below | 2026-07-262011 | Independent sourceStatbel be.STAT — unemployment rate of 15–64-year-olds by municipality, Census 2011 Source-backed value |
Climate and air quality
Annual PM2.5 was 8.09 µg/m³ at the end of 2024. Annual NO₂ was 11.2 µg/m³ at the end of 2024.
Published monthly climate normals for this city.
Published monthly climate normals for this city.
Published monthly climate normals for this city.
City values from the published air-quality observations. WHO 2021 guidelines and EU limit values are published constants.
Published annual means from the same national measurement network.
| Metric | Value | Verified | Source |
|---|---|---|---|
| NO₂ — annual mean | 11.1757 µg/m³country median 9.2 — 21% above | 2026-07-152024 | Official sourceOfficial RIO v2025 annual mean derived from daily population-weighted municipality concentrations for NIS5 11055; period 2024-01-01..2024-12-31 Source-backed value |
| PM10 — annual mean | 14.2645 µg/m³country median 13.8 — 3% above | 2026-07-152024 | Official sourceOfficial RIO v2025 annual mean derived from daily population-weighted municipality concentrations for NIS5 13019; period 2024-01-01..2024-12-31 Source-backed value |
| PM2.5 — annual mean | 8.0863 µg/m³country median 7.6 — 6% above | 2026-07-152024 | Official sourceOfficial RIO v2025 annual mean derived from daily population-weighted municipality concentrations for NIS5 62093; period 2024-01-01..2024-12-31 Source-backed value |
| Average daytime high by month | Jan 6.4 · Feb 7.2 · Mar 10.9 · Apr 15.1 · May 18.6 · Jun 21.5 · Jul 23.7 · Aug 23.5 · Sep 19.9 · Oct 15.1 · Nov 10.1 · Dec 6.7 °C | 2026-07-312020 | Official sourceWMO Climatological Normals 1991-2020 — station BRUSSELSNATIONALAIRPORT_06451.csv Source-backed value · nearest-station reading |
| Average night-time low by month | Jan 1.2 · Feb 1 · Mar 2.7 · Apr 5 · May 8.7 · Jun 11.7 · Jul 13.7 · Aug 13.4 · Sep 10.5 · Oct 7.4 · Nov 4.3 · Dec 1.9 °C | 2026-07-312020 | Official sourceWMO Climatological Normals 1991-2020 — station BRUSSELSNATIONALAIRPORT_06451.csv Source-backed value · nearest-station reading |
| Average temperature by month | Jan 3.8 · Feb 4.1 · Mar 6.8 · Apr 10 · May 13.6 · Jun 16.6 · Jul 18.7 · Aug 18.4 · Sep 15.2 · Oct 11.3 · Nov 7.2 · Dec 4.3 °C | 2026-07-312020 | Official sourceWMO Climatological Normals 1991-2020 — station BRUSSELSNATIONALAIRPORT_06451.csv Source-backed value · nearest-station reading |
| Average precipitation by month | Jan 66.6 · Feb 57.3 · Mar 52.2 · Apr 42.5 · May 56.2 · Jun 66.6 · Jul 71.3 · Aug 78 · Sep 59.1 · Oct 62.1 · Nov 69.6 · Dec 81.4 mm | 2026-07-312020 | Official sourceWMO Climatological Normals 1991-2020 — station BRUSSELSNATIONALAIRPORT_06451.csv Source-backed value · nearest-station reading |
| Average sunshine by month | Jan 59.1 · Feb 72.9 · Mar 125.8 · Apr 171.3 · May 198.3 · Jun 199.3 · Jul 203.2 · Aug 192.4 · Sep 154.5 · Oct 112.6 · Nov 65.8 · Dec 48.6 hours | 2026-07-312020 | Official sourceWMO Climatological Normals 1991-2020 — station UCCLE_06447.csv Source-backed value · nearest-station reading |
Annual PM2.5 fell 49.5% between 2014 and 2024, from 16.0 to 8.1.
Each point keeps the source and period it was published with.
Worked out from these numbers
Arithmetic on the published values above. Each one names what it assumed.
How international is the population?
3.7% of residents hold a foreign nationality — 875 people of 23,367 people. This counts nationality, not place of birth, so long-settled residents who naturalised are not in it.
Common questions
Answered from the published values on this page, each with its source and date.
What is the unemployment rate in Zemst?
The unemployment rate is 2.62 %. Source: Statbel be.STAT — unemployment rate of 15–64-year-olds by municipality, Census 2011, checked 2026-07-26.
Is the air quality good in Zemst?
The annual PM2.5 mean is 8.0863 µg/m³. The WHO 2021 guideline is 5 µg/m³ and the EU limit value is 25 µg/m³, so this reading is above the WHO guideline but within the EU limit. Source: Official RIO v2025 annual mean derived from daily population-weighted municipality concentrations for NIS5 62093; period 2024-01-01..2024-12-31, checked 2026-07-15.
How many people live in Zemst?
The published population is 23,367 people. Source: Belgium official denominator source, checked 2026-07-14.
How many foreign residents live in Zemst?
875 people residents hold a foreign nationality. Source: Official population by nationality at municipality grain; foreign population is TOTAL minus Belgique in the TOTAL row., checked 2026-07-15.
Cities of a similar size in Belgium
Closest published populations, for a like-for-like comparison.
Sources
Spotted a number that looks wrong? Every value here carries its source and date — tell us what you found and we will re-check it against the source.