Cergy
Cergy is a city in France. In 2022, population density was 5,972.4 people per km². The unemployment rate was 15.6% at the end of 2022. For Cergy, gigabit broadband availability was 98.4% in March 2026. Its population was 70,906 at the start of 2024. The city covered 11.7 km² in 2022.
Higher unemployment than 83% of French cities that publish it and dirtier air than 77% of French cities that publish it.
Who Cergy may suit
Relative profile scores use comparable published values. They are a decision aid, not a personal recommendation.
Population and city profile
Derived from the published population and foreign-resident counts.
| Metric | Value | Verified | Source |
|---|---|---|---|
| City area | 11.65 km2 | 2026-07-142022 | Official sourceA-ccepted source for city area and derived population density Source-backed value · place |
| Foreign residents | 15,127 people | 2026-07-152021 | Official sourceNationalité en 2021 — Base des tableaux détaillés — NAT1 Source-backed value |
| Population density | 5,972.3605 people/km² | 2026-07-142022 | Official sourceA-ccepted source for city area and derived population density Source-backed value · place |
| Population | 70,906 people | 2026-07-14Aging | Official sourceFrance official denominator source Source-backed value |
Cost of living
Published city cost observations. Some items come from the supplemental estimate lane and are not official statistics.
| Metric | Value | Verified | Source |
|---|---|---|---|
| Fitness club membership, monthly | 40 EUR/month | 2026-08-012024 | Supplemental estimateNumbeo — Cost of Living in Cergy (Wayback capture 20241207140829) Supplemental context |
| Internet, 60 Mbps unlimited | 20 EUR/month | 2026-08-012024 | Supplemental estimateNumbeo — Cost of Living in Cergy (Wayback capture 20241207140829) Supplemental context |
| Private kindergarten, monthly | 400 EUR/month | 2026-08-012024 | Supplemental estimateNumbeo — Cost of Living in Cergy (Wayback capture 20241207140829) Supplemental context |
| Mobile plan, 10 GB | 24.28 EUR/month | 2026-08-012024 | Supplemental estimateNumbeo — Cost of Living in Cergy (Wayback capture 20241207140829) Supplemental context |
| Monthly transport pass | 80 EUR/month | 2026-08-012024 | Supplemental estimateNumbeo — Cost of Living in Cergy (Wayback capture 20241207140829) Supplemental context |
| Basic utilities, 85 m² home | 118.04 EUR/month | 2026-08-012024 | Supplemental estimateNumbeo — Cost of Living in Cergy (Wayback capture 20241207140829) Supplemental context |
Work and income
Published unemployment rates for cities in the same country.
| Metric | Value | Verified | Source |
|---|---|---|---|
| Gigabit broadband availability | 98.43 % | 2026-07-15Fresh | Official sourceIndependent ARCEP municipal count of premises eligible for the >=1 Gbit/s fixed advertised-speed class, divided by the ARCEP type=all municipal premises denominator. This is availability/eligibility, not adoption, measured speed, FTTH-only coverage or mobile coverage. Source-backed value |
| Unemployment rate | 15.6141 %country median 10.5% — 48% above | 2026-07-262022 | Official sourceINSEE RP2022 ACT1 — population active by type of activity, commune Source-backed value |
Climate and air quality
Annual PM2.5 was 9.39 µg/m³ in 2024. Annual NO₂ was 17.4 µg/m³ in 2024. Annual PM10 was 11.6 µg/m³ in 2024.
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 | 17.4121 µg/m³country median 14.8 — 17% above | 2026-07-152024 | Official source2024 validated hourly NO2 station observations transformed to the exact INSEE commune centre by deterministic nearest-station selection and equal-weight aggregation. Source-backed value |
| NO₂ — latest reading | 15.1333 µg/m³ | 2026-07-15Fresh | Official sourceLatest valid NO2 hourly station observation on the official LCSQA E2 current-day extract, mapped to the exact INSEE centre through an exact normalized station-name crosswalk to EEA station metadata. Source-backed value |
| PM10 — annual mean | 11.6159 µg/m³country median 14.3 — 19% below | 2026-07-152024 | Official source2024 validated hourly NO2 station observations transformed to the exact INSEE commune centre by deterministic nearest-station selection and equal-weight aggregation. Source-backed value |
| PM2.5 — annual mean | 9.3924 µg/m³country median 8.5 — 11% above | 2026-07-152024 | Official source2024 validated hourly NO2 station observations transformed to the exact INSEE commune centre by deterministic nearest-station selection and equal-weight aggregation. Source-backed value |
| Average daytime high by month | Jan 7 · Feb 8.2 · Mar 12 · Apr 15.6 · May 19 · Jun 22.3 · Jul 24.9 · Aug 24.9 · Sep 21 · Oct 16 · Nov 10.7 · Dec 7.4 °C | 2026-07-311991 | Official sourceWMO Climatological Normals 1991-2020 — station PONTOISE_-_AERO Source-backed value · nearest-station reading |
| Average night-time low by month | Jan 1.6 · Feb 1.4 · Mar 3.2 · Apr 4.8 · May 8.2 · Jun 11 · Jul 12.9 · Aug 12.8 · Sep 10 · Oct 7.7 · Nov 4.4 · Dec 2.1 °C | 2026-07-311991 | Official sourceWMO Climatological Normals 1991-2020 — station PONTOISE_-_AERO Source-backed value · nearest-station reading |
| Average temperature by month | Jan 4.3 · Feb 4.8 · Mar 7.6 · Apr 10.2 · May 13.6 · Jun 16.7 · Jul 18.9 · Aug 18.8 · Sep 15.5 · Oct 11.9 · Nov 7.5 · Dec 4.7 °C | 2026-07-311991 | Official sourceWMO Climatological Normals 1991-2020 — station PONTOISE_-_AERO Source-backed value · nearest-station reading |
| Average precipitation by month | Jan 54.1 · Feb 45.9 · Mar 46.9 · Apr 43.9 · May 59.8 · Jun 50.2 · Jul 51.6 · Aug 55.4 · Sep 46.7 · Oct 58.2 · Nov 54.8 · Dec 68.3 mm | 2026-07-311991 | Official sourceWMO Climatological Normals 1991-2020 — station PONTOISE_-_AERO Source-backed value · nearest-station reading |
Annual PM2.5 fell 41.3% between 2013 and 2024, from 16.0 to 9.4.
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?
21.3% of residents hold a foreign nationality — 15,127 people of 70,906 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 Cergy?
The unemployment rate is 15.6141 %. Source: INSEE RP2022 ACT1 — population active by type of activity, commune, checked 2026-07-26.
Is the air quality good in Cergy?
The annual PM2.5 mean is 9.3924 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: 2024 validated hourly NO2 station observations transformed to the exact INSEE commune centre by deterministic nearest-station selection and equal-weight aggregation., checked 2026-07-15.
How many people live in Cergy?
The published population is 70,906 people. Source: France official denominator source, checked 2026-07-14.
How many foreign residents live in Cergy?
15,127 people residents hold a foreign nationality. Source: Nationalité en 2021 — Base des tableaux détaillés — NAT1, checked 2026-07-15.
How much is public transport in Cergy?
A monthly transport pass is 80 EUR/month. This is a supplemental estimate, not an official municipal measurement. Source: Numbeo — Cost of Living in Cergy (Wayback capture 20241207140829), checked 2026-08-01.
Cities of a similar size in France
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.