The earliest inhabitants of Cayuga County were Indians of the archaic period who lived along the shores of Cayuga Lake. Carbon dating established the time of occupance for these people around 3500 B.C. Archeological sites by Owasco Lake and along the Seneca River show the development of these early people so that by 1,000 A.D. in the Woodland Period, people of the Owasco Focus had begun farming and developed crops later copied by the Europeans.
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U.S. Census information
Your link for the official Cayuga County Website.