Union Mission Site is a historic site of a church mission and school about 5 miles (8.0 km) northeast of Mazie, Oklahoma.
The Union mission was started in 1820, and its school operated from 1821 to 1825. The school instructed 144 Indian children: 71 Osages, 54 Creeks, and 29 Cherokees; a total of 91 boys and 63 girls.[2]
Union Mission was the first Protestant mission established in Indian Territory (present-day Oklahoma).[3] It was also the site of the first school in Indian Territory and the first printing press in Indian Territory, and the first book printed in future Oklahoma.[4]
There are a few graves at the site, including the 1825 monument for Rev. Epaphras Chapman, which, per the NRHP nomination, is the oldest known
monument in Oklahoma.[2]