The Mount Rainier Post Office:

3709 Rhode Island Ave
Mount Rainier, MD 20712-9998

Phone:(301)864-5168
Toll-free: (800)275-8777

Hours:

Regular Business Hours: MO 08:30-05:00PM TU 08:30-05:00PM WE 08:30-05:00PM TH 08:30-05:00PM FR 08:30-05:00PM SA 08:30-12:00PM Last Collection: MO 05:30PM TU 05:30PM WE 05:30PM TH 05:30PM FR 05:30PM SA 04:00PM