US Post Office--Yellowstone Main
U.S. National Register of Historic Places
Post office in August 2008
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Location	Mammoth, Yellowstone National Park, Wyoming
Coordinates	44°58′37″N 110°41′56″W / 44.97699°N 110.69892°W / 44.97699; -110.69892
Built	1936
Architect	US Department of the Treasury; Louis A. Simon
Architectural style	Renaissance Revival/Moderne
MPS	Historic US Post Offices in Wyoming, 1900--1941, TR
NRHP reference No.	87000789
Added to NRHP	May 19, 1987[1]

The Yellowstone Main Post Office is a historic post office in Yellowstone National Park in Mammoth, Wyoming, United States, that is listed on the National Register of Historic Places (NRHP).

The Yellowstone facility is an understated classical structure with a low hipped roof and rounded dormers that uses a plan and a basic design vocabulary similar to that used in other post offices in the program. However it also includes restrained French Renaissance Revival elements, the only post office in the western United States to merge these two styles.^[2] It is somewhat at odds with the prevailing design theme expressed in other buildings in the former Fort Yellowstone district.^[3] The Yellowstone Main Post Office is also a contributing property to the Mammoth Hot Springs Historic District.^[2]

The post office was built in Mammoth Hot Springs as part of a facilities improvement program by the United States Post Office Department (USPOD). It was nominated to the (NRHP) as part of a thematic study comprising twelve Wyoming post offices built to standardized USPOD plans in the early twentieth century.^[2]

• National Register of Historic Places listings in Yellowstone National Park
• National Register of Historic Places listings in Park County, Wyoming
• List of National Historic Landmarks in Wyoming

• Yellowstone Main Post Office at the Wyoming State Historic Preservation Office