Prairie State primarily services the following areas
- Sangamon County
- Menard County
- Christian County
- Logan County
- Cass County
- Macoupin County
- Macon County
- Mason County
- Adams County
- Brown County
- Schuyler County
- Piatt County
- Scott County
- Pike County
- Fulton County
- Dewitt County
- Tazewell County
- Champaign County
- Montgomery County
- Greene County
- Schuyler County
- Hancock County
- Fulton County
- and Tazewell County