Town Hall Address 302 W Avery Ave Pittsburg, IL 62974 United States- Williamson County Town Clerk 618-993-8260 302 W Avery Ave Pittsburg, IL 62974 United States Water 618-993-8260 302 W Avery Ave Pittsburg, IL 62974 United States Tax Collector (618) 997-1301 200 W Jefferson St Marion, IL 62959 United States County Williamson