| Mason County | County Government | 40.23761 | -89.97253 | 22 |
| EMS Agencies and Hospitals | Mason County Ambulance (Mason City) | 40.23761 | -89.97253 | 22 |
| EMS Agencies and Hospitals | Mason District Hospital (Havana) | 40.312 | -90.05539 | 5 |
| Municipalities and Districts | Townships and Water Districts | 40.23761 | -89.97253 | 22 |
| Municipalities and Districts | Bath | 40.19338 | -90.14095 | 1 |
| Municipalities and Districts | Easton | 40.23254 | -89.84261 | 2 |
| Municipalities and Districts | Forest City | 40.37004 | -89.82761 | 1 |
| Municipalities and Districts | Havana | 40.30004 | -90.06095 | 3 |
| Municipalities and Districts | Kilbourne Fire Protection District | 40.23761 | -89.97253 | 22 |
| Municipalities and Districts | Manito | 40.42587 | -89.77928 | 5 |
| Municipalities and Districts | Mason City | 40.20227 | -89.69816 | 2 |
| Municipalities and Districts | San Jose | 40.3056 | -89.60288 | 4 |
| Schools | First Student Buses (Manito) | 40.42587 | -89.77928 | 2 |
| Schools | Havana School District #126 | 40.30004 | -90.06095 | 5 |
| Schools | Illinois Central Community Unit School District #180 | 40.23761 | -89.97253 | 22 |
| Schools | Midwest Central School District 91 (Manito) | 40.42587 | -89.77928 | 5 |
| Airports | Havana Regional Airport [9I0] | 40.21913 | -90.02369 | 0.4 |
| Airports | Manito Mitchell Airport [C45] | 40.48934 | -89.77808 | 0.31 |
