Willisburg, a northern Washington county city, was chartered in 1838. The source of the name is not known, although it may have been named for an early postmaster. Willisburg was incorporated in 1965. The Willisburg post office opened in 1844, but a post office operated in the area from 1838 to 1839 as Paoli or Paeola. The population in 2010 was 282.