Welcome to Delaware County! Use the top navigation bar to find more detailed information about our county. History of County Towns of Delaware County, Oklahoma are: Bernice Brush Creek Bull Hollow Cayuga Cleora Cloud Creek Colcord Copeland Dennis Dodge Dripping Springs Flint Creek Grove Jay (County Seat) Kansas Leach New Eucha Oaks Old Eucha Rocky Ford Sycamore Tagg Flats Twin Oaks West Siloam Springs Zena Delaware Co. Mailing List - correspond with others discussing research in this area. Neighboring Counties Oklahoma : Ottawa - Craig - Mayes - Cherokee - Adair Missouri: McDonald  Arkansas: Benton Delaware Co. Archives - Rootsweb Archives The 1930 Federal Census of Oklahoma is now available at the Grove Public Library. The Delaware County Genealogical Society purchased the census and donated them to the Grove Public Library. The microfilm is available at the library to everyone.  All Oklahoma Counties - Listing of all counties. State Resources - Quick links to helpful resources for Oklahoma research. Also, don't miss when considering Delaware County.