- Your Ad Here Herkimer County is a county located in the U.S. state of New York. As of the 2016 census, the population was 62,613. Its county seat is the Village of Herkimer. Sponsored Links History It was created in 1791. It is named after General Nicholas Herkimer, who died from battle wounds in 1777 after taking part in the Battle of Oriskany. |