| Carroll County | Carroll County | 42.095 | -89.973 | 18.18 |
| Carroll County | Townships | 42.095 | -89.973 | 18.18 |
| Carroll County | Chadwick | 42.01487 | -89.88945 | 0.4 |
| Carroll County | Lanark | 42.10225 | -89.83345 | 0.66 |
| Carroll County | Milledgeville | 41.96336 | -89.77456 | 0.5 |
| Carroll County | Mount Carroll | 42.09502 | -89.97818 | 2 |
| Carroll County | Savanna | 42.09542 | -90.15038 | 1 |
| Carroll County | Shannon | 42.15182 | -89.74011 | 0.5 |
| Carroll County | Thomson | 41.95617 | -90.10746 | 0.5 |
| Federal | Thomson Administrative U.S. Penitentiary | 41.973 | -90.109 | 0.5 |
| Amateur Radio | Miscellaneous | 42.095 | -89.973 | 18.18 |
| Airports | Tri-Township Airport (Savanna) [SFY] | 42.04583 | -90.10794 | 0.5 |
