[2] It was added to the National Register of Historic Places on December 17, 1992.

[3] The buildings range from the Creek National Capitol, built in 1878, to the five- to eight-story buildings constructed during the late 1910s and the 1920s of the oil boom.

[3] The district includes the predominantly African-American commercial area which built up on 5th & 6th Streets.

[4] The Okmulgee Historic Preservation Commission was established in 1988 as part of that Historic Preservation Ordinance passed by the town's City Council to provide protection to the district.

[5] At least one subsequent architectural survey has identified other districts and structures in Okmulgee which might qualify for historical listing, but no action has been taken.