|Land area1||4.31 km2 (1.66 sq mi)|
|- Density||10,791 /km2 (27,950 /sq mi)|
|INSEE/Postal code||93071/ 93400|
|1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km² (0.386 sq mi or 247 acres) and river estuaries.|
|2 Population without double counting: residents of multiple communes (e.g., students and military personnel) only counted once.|
Saint-Ouen is home to Paris's flea market, the highest concentration of antique dealers and second-hand furniture dealers in the world.. The flea market (marché aux puces) is held every Saturday, Sunday, and Monday; because of this high frequency, compared to other flea markets, it has tended to consist only of professionals who rent their spot for a minimum term of three years.
Saint-Ouen also includes the Cimetière de Saint-Ouen.
On 1 January 1860, the city of Paris was enlarged by annexing neighbouring communes. On that occasion, a part of the commune of Saint-Ouen was annexed to the city of Paris. At the same time, the commune of La Chapelle-Saint-Denis was disbanded and divided between the city of Paris, Saint-Ouen, Saint-Denis, and Aubervilliers. Saint-Ouen received a small part of the territory of La Chapelle-Saint-Denis. The commune of Montmartre was also disbanded; the city of Paris annexed most of Montmartre, but Saint-Ouen did receive a small northern part of the territory of that commune.
The canton of Saint-Ouen includes only part of the commune. The other part belongs to the canton of Saint-Denis-Sud (South).
- Jacques Gondouin (1737–1818), architect
- Alphonse Halimi (1932-2006), boxer
- Dany Bill (born 28 April 1973), seven-times Muaythai World champion.
- Abdoulaye Soumare, footballer
- Djimi Traore footballer
Twin towns - Sister cities 
Saint-Ouen is twinned with:
See also 
|Wikimedia Commons has media related to: Saint-Ouen, Seine-Saint-Denis|