Wabash County, Illinois (IL) County population in 2014: 11,549 (61% urban, 39% rural); it was 12,937 in 2000. County owner-occupied with a mortgage or a loan houses and condos in 2010: 2,017. County owner-occupied free and clear houses and condos in 2010: 1,705. County owner-occupied houses and condos in 2000: 3,904.