Below is a list of Pittsburg IL zip codes. For your research we have also included Pittsburg Area Code, Time Zone, UTC and the local Williamson County FIPS Code. Each Pittsburg Illinois zip code has a center Longitude / Latitude point (the Pittsburg center is -88.854301452637 / 37.777099609375). For your convenience we have also indicated if that zip code in Pittsburg observes Daylight Savings time.