Post Office - Brownstown 10981 Branch Rd Brownstown, WA 98920 Phone : (509) 848-2218 Post Office - Brownstown Business Category Post Offices Toll-Free           (800) ASK-USPS United States Government--nuclear Regulatory Commission, Brownstown 10981 Branch Rd Harrah, WA 98933 Phone : (509) 848-2218 United States Government--nuclear Regulatory Commission, Brownstown Business Category Government Offices-Federal Government Offices & Public Schools