Schuyler County is a county in the U.S. state of Illinois. According to the 2020 census, it had a population of 6,902. Its county seat is Rushville. Schuyler County was formed in 1825 out of Pike and Fulton counties. It is named for Philip Schuyler, member of the Continental Congress and Senator from New York. In 1826, the county seat was moved from B…Schuyler County is a county in the U.S. state of Illinois. According to the 2020 census, it had a population of 6,902. Its county seat is Rushville. Schuyler County was formed in 1825 out of Pike and Fulton counties. It is named for Philip Schuyler, member of the Continental Congress and Senator from New York. In 1826, the county seat was moved from Beardstown to Rushville.