Jefferson County Oklahoma has 7 places on the National Register of Historic Places including 2 places of Statewide significance. Significant places include San Bernardo and State Highway 79 Bridge at the Red River, Archeological Site 34JF109, First Presbyterian Church and Irving Baptist Church dating back to 1000.
Some of the country's most noteable architects helped create the Jefferson County places including Rock Island & Pacific RR Co Chicago, J.B. Osborn, J.C. Berry, Layton,Hicks and & Forsyth. Prominent architectural styles found in Jefferson Country are Art Deco, Gothic Revival and Tudor Revival.