Security in the commune is ensured by the presence of a police commisariat as well as a fire and rescue centre.

Public service bodies are relatively numerous in Arpajon which has a postal agency an Employment office and ASSEDICs, a Treasury and Tax centre a family allowance office a primary health insurance office, and a subdivision of the DDE.

Two notarial offices, a bailiff's office, and two lawyers attached to the bar of Évry is located in the town.

From 1985 to 2009 a Registry of the District Court was installed in the town.
Before the reform of the justice system the commune had a District Court but now depends on the one at Longjumeau, as with the Labour Court, the High Court, and the Commerce Court at Évry which are all attached to the Court of Appeal of Paris.
Security in the commune is ensured by the presence of a police commisariat as well as a fire and rescue centre.
Public service bodies are relatively numerous in Arpajon which has a postal agency an Employment office and ASSEDICs, a Treasury and Tax centre a family allowance office a primary health insurance office, and a subdivision of the DDE.
Two notarial offices, a bailiff's office, and two lawyers attached to the bar of Évry is located in the town.
From 1985 to 2009 a Registry of the District Court was installed in the town. Before the reform of the justice system the commune had a District Court but now depends on the one at Longjumeau, as with the Labour Court, the High Court, and the Commerce Court at Évry which are all attached to the Court of Appeal of Paris.
Arpajon