2026 comparison
Cergy vs Herblay-sur-Seine: 2026 comparison
Cergy has more inhabitants than Herblay-sur-Seine: 71,250 versus 32,044, or 2.2 times as many. Herblay-sur-Seine covers a larger area (12.7 km² versus 11.7 km²), but Cergy is more densely populated: 6,116 inhabitants per km² versus 2,515.
The median apartment price is higher in Herblay-sur-Seine: €3,754 per m² versus €3,320. The median standard of living is higher in Herblay-sur-Seine (€30,160 a year versus €22,560).
The two cities are 8.8 km apart as the crow flies, in the same department and the same urban unit (Paris).
© L. Pages - Ville de Cergy, CC BY-SA 4.0
Cergy
City in Val-d'Oise
- Population
- 71,250 inhab.
- 74th in France · 2nd in its department
- Area
- 11.7 km²
- Density
- 6,116 per km²
Herblay-sur-Seine
City in Val-d'Oise
- Population
- 32,044 inhab.
- 266th in France · 8th in its department
- Area
- 12.7 km²
- Density
- 2,515 per km²
Population
Population and demographics
Municipal population since 1876
CergyHerblay-sur-Seine
| Criterion | Cergy | Herblay-sur-Seine | Difference |
|---|---|---|---|
| Population inhab.More populous: Cergy2.2 times as high | 71,250 | 32,044 | More populous: Cergy2.2 times as high |
| Change over 5 yearsStronger growth: Cergy+1.3 pt | +6.9% | +5.6% | Stronger growth: Cergy+1.3 pt |
| Change over 10 yearsStronger growth: Herblay-sur-Seine+1.2 pt | +14.9% | +16.1% | Stronger growth: Herblay-sur-Seine+1.2 pt |
| Density per km²Denser: Cergy2.4 times as high | 6,116 | 2,515 | Denser: Cergy2.4 times as high |
| Under 15More young people: Cergy+0.3 pt | 22.6% | 22.3% | More young people: Cergy+0.3 pt |
| 65 and overMore seniors: Herblay-sur-Seine+4.3 pts | 9.1% | 13.4% | More seniors: Herblay-sur-Seine+4.3 pts |
| People per householdLarger households: Herblay-sur-Seine+0.17 | 2.41 | 2.58 | Larger households: Herblay-sur-Seine+0.17 |
Sources: INSEE, official population figures, INSEE, censuses, INSEE, census
Housing
Real estate prices and housing
| Criterion | Cergy | Herblay-sur-Seine | Difference |
|---|---|---|---|
| Median apartment price €/m²More expensive: Herblay-sur-Seine+13% | 3,320 | 3,754 | More expensive: Herblay-sur-Seine+13% |
| Median house price €/m²More expensive: Herblay-sur-Seine+33% | 3,113 | 4,155 | More expensive: Herblay-sur-Seine+33% |
| Apartment rent €/m² per month, utilities includedMore expensive: Herblay-sur-Seine+6% | 18.5 | 19.6 | More expensive: Herblay-sur-Seine+6% |
| House rent €/m² per month, utilities includedMore expensive: Herblay-sur-Seine+3% | 16.5 | 16.9 | More expensive: Herblay-sur-Seine+3% |
| Homeowner householdsMore homeowners: Herblay-sur-Seine+34 pts | 30.9% | 64.7% | More homeowners: Herblay-sur-Seine+34 pts |
| Share of housesMore houses: Herblay-sur-Seine+38 pts | 15.8% | 53.6% | More houses: Herblay-sur-Seine+38 pts |
| Social housing (SRU law) share of primary residencesMore social housing: Cergy+26 pts | 47.1% | 21.0% | More social housing: Cergy+26 pts |
| Second homesMore second homes: Cergy+3.8 pts | 4.4% | 0.7% | More second homes: Cergy+3.8 pts |
| Vacant homesMore vacant homes: Herblay-sur-Seine+1.6 pt | 7.9% | 9.5% | More vacant homes: Herblay-sur-Seine+1.6 pt |
| Property tax (combined rate)Higher rate: Cergy+4.0 pts | 47.54% | 43.50% | Higher rate: Cergy+4.0 pts |
Sources: DGFiP (DVF), Ministry of Housing (rent map), INSEE, census, Ministry for the Ecological Transition (SRU), DGFiP, local taxation
Income and jobs
Residents’ income and jobs
| Criterion | Cergy | Herblay-sur-Seine | Difference |
|---|---|---|---|
| Median standard of living €/yearHigher: Herblay-sur-Seine+34% | 22,560 | 30,160 | Higher: Herblay-sur-Seine+34% |
| Poverty rateHigher: Cergy+12 pts | 24.9% | 13.2% | Higher: Cergy+12 pts |
| Average taxable income per householdHigher: Herblay-sur-Seine+60% | €24,053 | €38,547 | Higher: Herblay-sur-Seine+60% |
| Households paying income taxMore taxpaying households: Herblay-sur-Seine+19 pts | 38% | 57% | More taxpaying households: Herblay-sur-Seine+19 pts |
| Activity rate (ages 15-64)Higher: Herblay-sur-Seine+3.7 pts | 72.1% | 75.8% | Higher: Herblay-sur-Seine+3.7 pts |
| Unemployment rate (census)Higher: Cergy+5.8 pts | 15.1% | 9.4% | Higher: Cergy+5.8 pts |
Sources: INSEE, Filosofi, DGFiP, income tax, INSEE, census
Local life
Town hall and fiber internet
| Criterion | Cergy | Herblay-sur-Seine | Difference |
|---|---|---|---|
| Mayor | Jean-Paul Jeandon | Philippe Rouleau | |
| Political label of the mayor’s list (2026 local elections) | union of the left | miscellaneous right | |
| Premises with fiberTie | 99% | 99% | Tie |
Sources: Ministry of the Interior, register of elected officials, Ministry of the Interior, Arcep
Shops and facilities
Shops, leisure and transportation
| Criterion | Cergy | Herblay-sur-Seine | Difference |
|---|---|---|---|
| Shops per 10,000 inhab.More shops per capita: Herblay-sur-Seine+41% | 39.2279 in total | 55.2177 in total | More shops per capita: Herblay-sur-Seine+41% |
| Food shops per 10,000 inhab.More per capita: Herblay-sur-Seine+22% | 13.395 in total | 16.252 in total | More per capita: Herblay-sur-Seine+22% |
| Restaurants per 10,000 inhab.More per capita: Cergy+42% | 30.6218 in total | 21.569 in total | More per capita: Cergy+42% |
| Sports facilities per 10,000 inhab.More per capita: Cergy+11% | 14.6104 in total | 13.142 in total | More per capita: Cergy+11% |
| Cultural venues per 10,000 inhab.More per capita: Cergy+35% | 1.712 in total | 1.24 in total | More per capita: Cergy+35% |
| Hotels per 10,000 inhab.More per capita: Cergy2.2 times as high | 1.410 in total | 0.62 in total | More per capita: Cergy2.2 times as high |
| Passenger train stationsMore stations: Cergy+2 | 3 | 1 | More stations: Cergy+2 |
Number of facilities per 10,000 inhabitants (total count in small print). Source: INSEE, facilities database (BPE)
Health
Health care
| Criterion | Cergy | Herblay-sur-Seine | Difference |
|---|---|---|---|
| Access to general practitioners visits/inhab./year localized potential accessibilityBetter access: Cergy+29% | 3.0 | 2.3 | Better access: Cergy+29% |
| General practitioners per 10,000 inhab.More per capita: Herblay-sur-Seine+24% | 3.827 in total | 4.715 in total | More per capita: Herblay-sur-Seine+24% |
| Medical specialists per 10,000 inhab.More per capita: Cergy+10% | 3.827 in total | 3.411 in total | More per capita: Cergy+10% |
| Dentists per 10,000 inhab.More per capita: Cergy2.6 times as high | 7.352 in total | 2.89 in total | More per capita: Cergy2.6 times as high |
| Pharmacies per 10,000 inhab.More per capita: Cergy+12% | 2.115 in total | 1.96 in total | More per capita: Cergy+12% |
| HospitalsTie | 1 | 1 | Tie |
Practitioners and facilities per 10,000 inhabitants (total count in small print); access to doctors includes those in neighboring communes. Sources: Ministry of Health (DREES), APL, INSEE, facilities database (BPE), Ministry of Health (Finess)
Education
Schools and colleges
| Criterion | Cergy | Herblay-sur-Seine | Difference |
|---|---|---|---|
| Primary schoolsMore schools: Cergy+36 | 53 | 17 | More schools: Cergy+36 |
| Middle schoolsMore middle schools: Cergy+5 | 10 | 5 | More middle schools: Cergy+5 |
| High schoolsMore high schools: Cergy+3 | 4 | 1 | More high schools: Cergy+3 |
| Higher education institutions and programsMore facilities: Cergy+27 | 27 | 0 | More facilities: Cergy+27 |
Sources: Ministry of Education, INSEE, facilities database (BPE)
Recorded crime
Offenses recorded by the police
| Criterion | Cergy | Herblay-sur-Seine | Difference |
|---|---|---|---|
| Home burglaries per 1,000 homesHigher rate: Herblay-sur-Seine+59% | 4.3 | 6.8 | Higher rate: Herblay-sur-Seine+59% |
| Non-violent thefts per 1,000 inhab.Higher rate: Cergy+92% | 12.9 | 6.7 | Higher rate: Cergy+92% |
| Physical violence outside the family per 1,000 inhab.Higher rate: Cergy+96% | 3.3 | 1.7 | Higher rate: Cergy+96% |
| Vehicle thefts per 1,000 inhab.Tie | 2.9 | 2.9 | Tie |
| Vandalism and property damage per 1,000 inhab.Higher rate: Herblay-sur-Seine+15% | 6.6 | 7.6 | Higher rate: Herblay-sur-Seine+15% |
Offenses recorded in the commune by the police and gendarmerie, per 1,000 inhabitants (per 1,000 homes for burglaries); this is not the actual crime level. Rates for the latest published year. Source: Ministry of the Interior (SSMSI)
Natural hazards
Natural disasters and prevention
| Criterion | Cergy | Herblay-sur-Seine | Difference |
|---|---|---|---|
| Natural disasters declared since 1982More declarations: Cergy+4 | 21 | 17 | More declarations: Cergy+4 |
| Natural hazard prevention plansMore plans: Herblay-sur-Seine+1 | 2 | 3 | More plans: Herblay-sur-Seine+1 |
| Radon potentialSame | Low | Low | Same |
Sources: Géorisques (GASPAR), IRSN
Land
Area, terrain and administrative areas
| Criterion | Cergy | Herblay-sur-Seine | Difference |
|---|---|---|---|
| Area km²Larger: Herblay-sur-Seine+9% | 11.7 | 12.7 | Larger: Herblay-sur-Seine+9% |
| Town hall elevationHigher: Cergy+30 m | 94 m | 63 m | Higher: Cergy+30 m |
| Coastal communeSame | No | No | Same |
| Density grid (INSEE)Same | Large urban centre | Large urban centre | Same |
| DepartmentSame | Val-d'Oise (95) | Val-d'Oise (95) | Same |
| Intercommunality | Communauté d'agglomération de Cergy-Pontoise | Communauté d'agglomération Val Parisis | |
| Urban unitSame | Paris | Paris | Same |
| Functional areaSame | Paris | Paris | Same |
Sources: IGN, IGN, elevation, Ministry for the Ecological Transition, Loi Littoral, INSEE, density grid, INSEE, COG, INSEE, geographic classifications
Summary
Cergy vs Herblay-sur-Seine at a glance
| Criterion | Cergy | Herblay-sur-Seine |
|---|---|---|
| Population inhab. | 71,250 | 32,044 |
| Change over 10 years | +14.9% | +16.1% |
| Density per km² | 6,116 | 2,515 |
| Median apartment price €/m² | 3,320 | 3,754 |
| Median house price €/m² | 3,113 | 4,155 |
| Apartment rent €/m² | 18.5 | 19.6 |
| Property tax (combined rate) | 47.54% | 43.50% |
| Median standard of living €/year | 22,560 | 30,160 |
| Unemployment rate (census) | 15.1% | 9.4% |
| Premises with fiber | 99% | 99% |
| Access to general practitioners visits/inhab./year | 3.0 | 2.3 |
| Home burglaries per 1,000 homes | 4.3 | 6.8 |
| Average temperature | 12.5°C | 12.5°C |
| Sunshine h/year | — | 1,634 |
| Area km² | 11.7 | 12.7 |
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FAQ
Cergy vs Herblay-sur-Seine: your questions
Which is the larger city, Cergy or Herblay-sur-Seine?
By population, Cergy: 71,250 inhabitants versus 32,044 for Herblay-sur-Seine (official population figures in force on January 1, 2026). Cergy is the 74th largest city in France, Herblay-sur-Seine the 266th. By area, Herblay-sur-Seine is the larger (12.7 km²).
How far is Cergy from Herblay-sur-Seine?
Cergy and Herblay-sur-Seine are 8.8 km apart as the crow flies, between the centers of the two communes, in the same department (Val-d'Oise).
Where is real estate more expensive, in Cergy or Herblay-sur-Seine?
To buy an apartment, Herblay-sur-Seine is more expensive: €3,754 per m² (median price), versus €3,320 in Cergy (+13%). Median prices of sales over the last five years (DGFiP, DVF).
Where is the standard of living higher, in Cergy or Herblay-sur-Seine?
In Herblay-sur-Seine, half of the residents have a standard of living above €30,160 a year, versus €22,560 in Cergy (disposable income per consumption unit, INSEE).
Are Cergy and Herblay-sur-Seine in the same department?
Yes: both towns are in Val-d'Oise (95), in the Île-de-France region.
Official population figures in force on January 1, 2026. Source: INSEE, official population figures