Towns
| State | City/Town | Town Title |
|---|---|---|
| Illinois | Princeton | Princeton, IL |
| Illinois | Princeville | Princeville, IL |
| Illinois | Prophetstown | Prophetstown, IL |
| Illinois | Prospect Heights | Prospect Heights, IL |
| Illinois | Pulaski | Pulaski, IL |
| Illinois | Putnam | Putnam, IL |
| Illinois | Quincy | Quincy, IL |
| Illinois | Radom | Radom, IL |
| Illinois | Raleigh | Raleigh, IL |
| Illinois | Ramsey | Ramsey, IL |
| Illinois | Rankin | Rankin, IL |
| Illinois | Ransom | Ransom, IL |
| Illinois | Rantoul | Rantoul, IL |
| Illinois | Rapids City | Rapids City, IL |
| Illinois | Raritan | Raritan, IL |
| Illinois | Raymond | Raymond, IL |
| Illinois | Red Bud | Red Bud, IL |
| Illinois | Reddick | Reddick, IL |
| Illinois | Redmon | Redmon, IL |
| Illinois | Renault | Renault, IL |
| Illinois | Reynolds | Reynolds, IL |
| Illinois | Richmond | Richmond, IL |
| Illinois | Richton Park | Richton Park, IL |
| Illinois | Richview | Richview, IL |
| Illinois | Ridge Farm | Ridge Farm, IL |