# Lagny-sur-Marne

> commune in Seine-et-Marne, France

**Wikidata**: [Q9155](https://www.wikidata.org/wiki/Q9155)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Lagny-sur-Marne)  
**Source**: https://4ort.xyz/entity/lagny-sur-marne

## Summary
Lagny-sur-Marne is a commune located in the Seine-et-Marne department of France, situated along the Marne River. It is part of the canton of Lagny-sur-Marne and has a population of approximately 20,718 residents. The commune is known for its historical significance and proximity to major urban centers in the Île-de-France region.

## Key Facts
- **Location**: Part of the Seine-et-Marne department in France.
- **Population**: 20,718 residents (as of recent estimates).
- **Coordinates**: Latitude 48.878055555556, Longitude 2.7066666666667.
- **Canton**: Lagny-sur-Marne (inception: March 22, 2015).
- **River**: Located along the Marne River, which gives its name to multiple communes and departments.
- **Website**: Official municipal website is [https://www.lagny-sur-marne.fr/](https://www.lagny-sur-marne.fr/).
- **Historical Population Data**: Population figures from 1607 to 2023, including notable increases and decreases over time.
- **Related Infrastructure**: The Marne River flows through or past numerous communes, including Lagny-sur-Marne, and is associated with the quai de la Marne in Paris.

## FAQs
**What is the population of Lagny-sur-Marne?**
Lagny-sur-Marne has a population of approximately 20,718 residents, with historical data showing fluctuations from 1,607 in 1607 to 21,580 in 2023.

**Which river flows through Lagny-sur-Marne?**
The Marne River flows through Lagny-sur-Marne, a significant geographical feature that also gives its name to multiple communes and departments in France.

**What is the official website of Lagny-sur-Marne?**
The official municipal website of Lagny-sur-Marne is [https://www.lagny-sur-marne.fr/](https://www.lagny-sur-marne.fr/).

**Which canton is Lagny-sur-Marne part of?**
Lagny-sur-Marne is part of the canton of Lagny-sur-Marne, which was established on March 22, 2015.

**What are some notable communes along the Marne River?**
Notable communes along the Marne River include Champigny-sur-Marne, Nogent-sur-Marne, and Champs-sur-Marne, all of which are situated in various departments across France.

## Why It Matters
Lagny-sur-Marne plays a significant role in the geographical and administrative landscape of France. As a commune located along the Marne River, it is part of a network of over 50 communes that share the "sur-Marne" suffix in their names. The river itself is a crucial geographical and administrative spine, giving its name to four French departments: Marne, Haute-Marne, Seine-et-Marne, and Val-de-Marne. The commune's proximity to major urban centers in the Île-de-France region, such as Champigny-sur-Marne and Nogent-sur-Marne, underscores its importance in regional infrastructure and urban planning. Additionally, the Marne River's influence extends to historical and cultural heritage, with features like the quai de la Marne in Paris reflecting its long-standing relationship with the capital city.

## Notable For
- Being one of over 50 communes along the Marne River, many of which include the suffix "sur-Marne" in their names.
- Serving as a key geographical and administrative hub within the Seine-et-Marne department.
- Contributing to the cultural and historical legacy of the Marne River, which is associated with multiple departments and significant urban centers.
- Hosting historical population data that reflects the commune's growth and development over centuries.

## Body

### Geography and Location
Lagny-sur-Marne is situated in the Seine-et-Marne department of France, with coordinates at latitude 48.878055555556 and longitude 2.7066666666667. The commune is located along the Marne River, a larger natural watercourse that traverses various landscapes and connects rural areas with urban centers. The river is classified as a significant geographical feature and lends its name to multiple administrative departments and communes.

### Administrative Divisions
Lagny-sur-Marne is part of the canton of Lagny-sur-Marne, which was established on March 22, 2015. The canton is a subdivision of the Seine-et-Marne department and plays a role in local governance and representation. The commune is also associated with the Marne River, which gives its name to four French departments: Marne, Haute-Marne, Seine-et-Marne, and Val-de-Marne. These departments utilize the river as a key geographic and identity marker.

### Population and Historical Data
The population of Lagny-sur-Marne has fluctuated over time, with historical data showing notable increases and decreases. The earliest recorded population was 1,607 in 1607, and the most recent estimate is 20,718 residents. The commune has experienced significant growth, particularly in the 20th and 21st centuries, reflecting broader trends in urbanization and regional development.

### Infrastructure and Urban Impact
The Marne River plays a central role in the geography of the Grand Paris metropolitan area. The river's influence extends to infrastructure and urban planning, with features like the quai de la Marne in Paris reflecting its long-standing historical relationship with the capital city. The commune of Lagny-sur-Marne is part of a network of over 50 communes that share the "sur-Marne" suffix in their names, all of which are situated in various departments across France.

### Cultural and Historical Heritage
Lagny-sur-Marne contributes to the cultural and historical legacy of the Marne River, which is associated with multiple departments and significant urban centers. The river's prominence is highlighted by the four French departments named after it: Marne, Haute-Marne, Seine-et-Marne, and Val-de-Marne. The commune's proximity to major urban centers in the Île-de-France region, such as Champigny-sur-Marne and Nogent-sur-Marne, underscores its importance in regional infrastructure and urban planning.

### Related Infrastructure
The Marne River flows through or past numerous communes, including Lagny-sur-Marne, and is associated with the quai de la Marne in Paris. The river's presence has shaped local infrastructure, evidenced by features like the quai de la Marne, which dates back to January 1, 1802. The commune of Lagny-sur-Marne is part of a broader network of communes that rely on the Marne River for their geographic identity and regional significance.

## References

1. French National Directory of Representatives
2. [Jumelage](https://www.lagny-sur-marne.fr/municipalite/votre-ville/jumelage/)
3. [Sandre](https://www.sandre.eaufrance.fr/geo/CoursEau/F---0100)
4. Virtual International Authority File
5. BnF authorities
6. dataset of postal codes in France. 2018
7. INSEE code
8. [Source](https://data.iledefrance.fr/explore/dataset/villes_idf_label_vvf/download?format=csv)
9. répertoire géographique des communes
10. Freebase Data Dumps. 2013
11. Annuaire de service-public.fr
12. MusicBrainz
13. Recensement de la population 2015. National Institute of Statistics and Economic Studies. 2017
14. Populations légales 2016
15. Populations légales 2017
16. Populations légales 2018
17. Populations légales 2019
18. Populations légales 2020
19. Populations légales 2021
20. Populations de référence 2022
21. Populations de référence 2023
22. [Code officiel géographique. 2017](https://www.insee.fr/fr/information/2560698)
23. [Code officiel géographique](https://www.insee.fr/fr/information/3363419)
24. National Institute of Statistics and Economic Studies
25. GeoNames
26. [répertoire géographique des communes. 2015](https://wxs-telechargement.ign.fr/83edtfdyqte031y0ra49d2e3/telechargement/inspire/RGC-2015-01$RGC2015/file/RGC2015.7z)
27. [2016](https://data.geopf.fr/telechargement/download/GEOFLA/GEOFLA_2-2_COMMUNE_SHP_LAMB93_FXX_2016-06-28/GEOFLA_2-2_COMMUNE_SHP_LAMB93_FXX_2016-06-28.7z)
28. [Ville de Lagny-sur-Marne: Overview | LinkedIn](https://www.linkedin.com/company/ville-lagny-sur-marne/)