Post Office - Littlerock 6310 128th Ave Sw Littlerock, WA 98556 Phone : (360) 352-5140 Post Office - Littlerock Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (360) 352-3526 United States Government--postal Service, Littlerock Office 6310 128th Ave Sw Olympia, WA 98501 Phone : (360) 352-5140 United States Government--postal Service, Littlerock Office Business Category Government Offices-Federal Government Offices & Public Schools