Darien has two post offices. The Darien Post Office, at 30 Corbin Drive (800-275-8777) is open from 8 to 5:30 Monday through Friday, and 8 to 12:30 on Saturday.

The Noroton Heights Post Office, at 368 Heights Road (203-655-0631) is open from 8:30 to 4:30 (closed from 11 to noon), Monday through Friday. It is closed on Saturday.