Photo: Robin.barbacetto · CC BY-SA 4.0Méry-sur-Oise records theft of vehicle parts at 5.9 times the rate of a typical town its size
The rate the grade counts dropped 7% from 2023 to 2025. Its Safety Grade, C+ (#30 of 73 in Val-d'Oise), rests on offenses police and gendarmerie recorded from 2023 to 2025: close to the middle of compared French towns. The local count comes to 7.8 violent crimes and 15.3 incidents of burglary, vehicle theft and damage per 1,000 people each year.
Offenses recorded per 1,000 residents a year, 2023–2025 average (INSEE population of each year). Violence, and burglaries, vehicle thefts, thefts from vehicles and criminal damage, count equally.
What stands out about safety in Méry-sur-Oise
Family violence fell sharply
Police and gendarmerie recorded 54 cases of family violence in Méry-sur-Oise in 2023 and 29 in 2025. Small counts swing from year to year; the grade averages the three years. Year by year ↓
Among towns its size
Among the 809 French towns of 7,000 to 13,500 people with a Safety Grade, Méry-sur-Oise is 387th from the lowest recorded rate per resident. Towns its size ↓
Written from the SSMSI and INSEE data on this page. Figures are offenses police and gendarmerie recorded, not convictions.
Inside Méry-sur-Oise’s C+ for safety
A fairly firm grade. Built on 689 offenses recorded in the graded categories over three years; with a town of 9,983, a few cases more or fewer would move it between C+ and B−.
Hidden counts: for armed robbery, this figure isn’t published when it’s small (five or fewer in at least one of the last three years); the index uses the département’s average instead, 0.4% of the index here. What isn’t published ↓
Per resident, against the 4,295 compared French towns with a Safety Grade.
What police and gendarmerie recorded most in 2025
Well above the median of towns its size: theft of vehicle parts (2.6 per 1,000 against 0.4), vehicle theft (3.5 per 1,000 against 0.7) and drug use (3 per 1,000 against 1.2). Not published for 2025: armed robbery, robbery without a weapon and drug dealing.
Theft without violence, robbery without a weapon, theft of vehicle parts, fraud and drug offenses are shown for information but left out of the Safety Grade, which counts violence plus burglaries, vehicle thefts, thefts from vehicles and criminal damage per resident.
Per 1,000 residents in 2025; the tick is the median of the graded French towns of 2,500 to 10,000.
Méry-sur-Oise, year by year
Violence · per 1,000 residents
Burglary, vehicle theft, damage · per 1,000 residents
| Kind | In the grade | 2023 | 2024 | 2025 |
|---|---|---|---|---|
| Family violence | Violence | 54 | 35 | 29 |
| Other physical violence | Violence | 22 | 26 | 19 |
| Sexual violence | Violence | 11 | 14 | 20 |
| Armed robbery | Violence | n.p. | 0 | n.p. |
| Burglary | Burglary, vehicle theft, damage | 28 | 28 | 28 |
| Vehicle theft | Burglary, vehicle theft, damage | 23 | 27 | 35 |
| Theft from vehicles | Burglary, vehicle theft, damage | 26 | 30 | 27 |
| Criminal damage | Burglary, vehicle theft, damage | 70 | 77 | 60 |
| Theft without violence | Not in the grade | 38 | 45 | 36 |
| Robbery without a weapon | Not in the grade | n.p. | n.p. | n.p. |
| Theft of vehicle parts | Not in the grade | 16 | 37 | 26 |
| Fraud | Not in the grade | 69 | 51 | 68 |
| Drug use | Not in the grade | 49 | 32 | 30 |
| Drug dealing | Not in the grade | n.p. | n.p. | n.p. |
Counts mix units, as SSMSI publishes them: victims for violence, offenses for burglary and damage, vehicles for vehicle theft. That’s why the page never adds them into one “total crimes”.
Offenses recorded each year. n.p.: not published (small: five or fewer in at least one of the last three years).
Crime in Méry-sur-Oise per 1,000 residents
Each dot is one resident’s share: offenses are counted, not victims, and one person can be the victim of several.
And 15 burglaries, vehicle thefts, thefts from vehicles and acts of criminal damage, and 10 thefts without violence and frauds: a year, 2023–2025 average.
Méry-sur-Oise places 387th of 809 towns its size, the least crime first
| # | Town | People | Violence | Homes, vehicles | Safety |
|---|---|---|---|---|---|
| 1 | Grand-Santi French Guiana | 9,668 | 4.9 | 1.6 | A+ |
| … | |||||
| 203 | Le Plessis-Bouchard Val-d'Oise | 8,518 | 4.9 | 14.4 | B |
| … | |||||
| 215 | Courdimanche Val-d'Oise | 7,311 | 4.4 | 15.1 | B |
| … | |||||
| 258 | Saint-Prix Val-d'Oise | 7,612 | 4.3 | 16.3 | B− |
| … | |||||
| 291 | Bessancourt Val-d'Oise | 8,869 | 4.9 | 16.5 | B− |
| … | |||||
| 384 | Longvic Côte-d'Or | 8,896 | 6.4 | 16.6 | C+ |
| 385 | Villeneuve-Tolosane Haute-Garonne | 11,044 | 8.5 | 14.6 | C+ |
| 386 | Trévoux Ain | 7,013 | 7.9 | 15.2 | C+ |
| 387 | Méry-sur-Oise Val-d'Oise | 9,983 | 7.8 | 15.3 | C+ |
| 388 | Beausoleil Alpes-Maritimes | 11,936 | 6.7 | 16.4 | C+ |
| 389 | Villemoisson-sur-Orge Essonne | 7,332 | 4.4 | 18.8 | C+ |
| 390 | Mably Loire | 7,233 | 5.7 | 17.5 | C+ |
| … | |||||
| 809 | Argelès-sur-Mer Pyrénées-Orientales | 10,616 | 21.1 | 40.6 | D− |
Per 1,000 residents a year. Context only: the grade compares Méry-sur-Oise with every compared French town, not just towns its size.
Lowest rate in the graded categories first, 2023–2025 average, with the closest to Méry-sur-Oise and up to four from Val-d'Oise.
Méry-sur-Oise and the towns around it
| Town | People | Violence | Homes, vehicles | Safety |
|---|---|---|---|---|
| Méry-sur-Oise | 9,983 | 7.8 | 15.3 | C+ |
| Auvers-sur-Oise | 6,863 | 5.6 | 18.3 | C+ |
| Frépillon | 3,317 | 5.1 | 20.3 | C |
| Mériel | 5,347 | 4.2 | 16.1 | B |
| Bessancourt | 8,869 | 4.9 | 16.5 | B− |
| Pierrelaye | 10,130 | 8.7 | 26.6 | D |
| Saint-Ouen-l'Aumône | 25,578 | 7.2 | 19.7 | C |
2 of its 6 graded neighbors have a lower recorded rate in the graded categories than Méry-sur-Oise.
The nearest towns of 2,500 or more, per 1,000 residents a year, 2023–2025 average.
What this data can and can’t tell you
- Where offenses happen, not where victims live. SSMSI counts each offense in the commune where police or gendarmerie recorded it happening. Towns with shops, stations, a hospital or nightlife record more per resident, and visitors are part of that count but not of the population it is divided by.
- An index, not a total. The kinds are counted in different units (victims, offenses, vehicles), so the grade adds their rates per 1,000 residents into an index and never shows a “total crimes” or a chance of being a victim.
- Hidden counts. SSMSI doesn’t publish a commune’s count when it’s small (five or fewer in at least one of the last three years). In its place it gives the average among the département’s communes whose count is hidden; the grade uses that average, never zero, and a town gets no Safety Grade when over a quarter of its index would come from such averages.
- Recorded, not all crime. Only offenses reported to or found by police and gendarmerie are counted. Reporting rates differ by kind: most vehicle thefts are reported, much family and sexual violence isn’t.
Questions about safety in Méry-sur-Oise
Is Méry-sur-Oise safe?
It has more crime per resident than 58% of compared French towns: an average of 7.8 recorded violent incidents and 15.3 recorded burglaries, vehicle thefts, thefts from vehicles and acts of criminal damage per 1,000 residents a year, 2023–2025. It grades C+ for safety, #30 of 73 in Val-d'Oise. Among the 809 French towns of 7,000 to 13,500 people, it is 387th from the lowest rate.
Is crime going up in Méry-sur-Oise?
The recorded rate in the graded categories fell 7% from 2023 to 2025: 23.6 per 1,000 residents in 2023, 22 in 2025. In a town this size a few dozen cases move the figure, so the grade uses the three-year average.
What is the most common recorded offense in Méry-sur-Oise?
Fraud: 68 in 2025, shown for information, not in the grade. Then criminal damage (60), theft without violence (36) and vehicle theft (35).
Sources: SSMSI (Interior Ministry), recorded crime by commune, 2023–2025 (base communale de la délinquance enregistrée, 2026 edition) · INSEE, legal populations for each year · INSEE, census 2023 (jobs and working residents) · IGN Admin Express (boundaries) · TownRatings grades: our own summary of the data, ranking French towns against each other only, updated November 4, 2026. Under the Licence Ouverte / Open Licence 2.0 (Etalab).
Contains public sector information under the Licence Ouverte / Open Licence 2.0 (Etalab): INSEE, DGFiP, the Interior Ministry’s statistics service (SSMSI), the Ministry of Education (DEPP), the Health Ministry’s statistics service (DREES) and the Housing Ministry (Carte des loyers). Commune boundaries: IGN Admin Express.