In 1852, when the post office was first established, the town was named Mineral Hill and was within the Choctaw Nation, Indian Territory. The 1855 Treaty of Separation between the Choctaws and Chickasaws established the latter as a separate nation, effective March 4, 1856. Mill Creek then fell within the Chickasaw Nation boundaries. The post office was renamed Harris Mill in 1859, after Chickasaw Governor Cyrus Harris built a large grist mill on the local creek. The name changed back to Mill Creek in 1879. In 1902, the town of Mill Creek incorporated in Indian Territory, and after statehood, became Mill Creek, Oklahoma, on November 16, 1907.
Founding dates: Wikidata, Wikipedia, the U.S. post office records of Blevins & Helbock (CC0) and the Census. Homes by year built: Census ACS 2020–24. National Register of Historic Places: National Park Service (list of May 22, 2026). Old photos, postcards and papers: Wikimedia Commons, the Library of Congress and other public archives, credited on each item’s page. Maps: U.S. Geological Survey historical topographic maps (via Esri) and Sanborn fire-insurance maps (Library of Congress). History text and census tables: Wikipedia (CC BY-SA 4.0). Places that used to be: USGS Geographic Names Information System (2021). How TownRatings grades history →
From Wikipedia, U.S. Geological Survey historical maps, U.S. Census counts (via Wikipedia), the US Post Offices dataset (Blevins & Helbock) and the USGS Geographic Names Information System. Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.