Marijampolė Municipality was established in 2000 after the territorial administrative reform, which abolished the Marijampolė District Municipality.
Marijampolė has a City Council with 27 members. The members of the City Council represent different Lithuanian political parties.
The town of Marijampolė and its 6 surrounding elderships make up the territory of Marijampolė Municipality. They are: Gudeliai, Igliauka, Liudvinavas, Marijampolė, Sasnava, and Šunskai communities. Marijampolė Municipality covers 755 square kilometres (292 sq mi) of land; 72% of which is an agricultural area, 12.3% is covered by forests; 4.2% – towns and villages, 2% – industrial enterprises and roads, and 6.9% – area used for other purposes.