Stadtallendorf
| Stadtallendorf   | |
|---|---|
| Aerial view | |
| Location of Stadtallendorf   within Marburg-Biedenkopf   district | |
| Coordinates: 50°50′N 09°01′E / 50.833°N 9.017°E | |
| Country | Germany | 
| State | Hesse | 
| Admin. region | Gießen | 
| District | Marburg-Biedenkopf | 
| Government | |
| • Mayor (2023–29) | Christian Somogyi (SPD) | 
| Area | |
|  • Total | 78.29 km2 (30.23 sq mi) | 
| Elevation | 256 m (840 ft) | 
| Population  (2023-12-31) | |
|  • Total | 21,407 | 
| • Density | 270/km2 (710/sq mi) | 
| Time zone | UTC+01:00 (CET) | 
| • Summer (DST) | UTC+02:00 (CEST) | 
| Postal codes | 35260 | 
| Dialling codes | 06428 | 
| Vehicle registration | MR | 
| Website | www.stadtallendorf.de | 
Stadtallendorf is a town in the district of Marburg-Biedenkopf, Hesse, Germany. It lies about 18 km (11 miles) east of Marburg. In 2010, the town hosted the 50th Hessentag state festival.