Federal Government Offices--postal Service 107820 N Us Highway 89 Etna, WY 83118 Phone : (307) 883-2220 Business Category Government Offices-Federal Miscellaneous General Merchandise Stores Army & Navy Goods Miscellaneous Retail Stores Government Offices & Public Schools United States Government--post Office Etna, WY 83118 Phone : (307) 883-2220 Business Category Government Offices-Federal Post Offices Miscellaneous General Merchandise Stores Army & Navy Goods Miscellaneous Retail Stores Government Offices & Public Schools Post Office - Etna 107857 N Us Highway 89 Etna, WY 83118 Phone : (307) 883-2220 Business Category Post Offices Toll-Free           (800) ASK-USPS