|Elevation||51–83 m (167–272 ft)|
|Land area1||11.57 km2 (4.47 sq mi)|
|- Density||244 /km2 (630 /sq mi)|
|INSEE/Postal code||91579/ 91770|
|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.|
Inhabitants of Saint-Vrain are known as Saint-Vrainois.
The Juine forms the commune's southeastern border.
Structures and monuments 
A castle with a historic zoological park (with reconstructions of prehistoric scenes) is located here, but has been closed to the public since 1998. The town also has a Louis XV-era obelisk and a thirteenth century church.
See also 
Media related to Saint-Vrain, Essonne at Wikimedia Commons
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