what county is jacksonville, il
History Lives in Morgan County. Morgan County was established in 1823 and named for General Daniel Morgan, a Revolutionary War hero. In 1825 the Morgan County surveyors staked out land at the center of a 160-acre tract, and the seat of government was established in the new town of Jacksonville. Thanks to early settlers Alexander Cox, Joseph Fairfield and George Hackett, the Jacksonville town square quickly developed.