| population | |
| Carbough School (historical) | |
| Centenary Cemetery | |
| Harmon | 120 |
| Harmon Fire Department | |
| Harmon United Methodist Church |
 | Whiteside County Airport - Joseph H Bittorf Field | ~ 9.04 km |
| Illinois Valley Regional Airport-Walter A Duncan Field | ~ 53.45 km |
| Rinkenberger Restricted Landing Area | ~ 53.94 km |
| Albertus Airport | ~ 59.07 km |
| Clinton Municipal Airport | ~ 63.94 km |
| Chicago Rockford International Airport | ~ 66.39 km |
| Quad City International Airport | ~ 83.11 km |
| Davenport Municipal Airport | ~ 85.18 km |
| Aurora Municipal Airport | ~ 91.33 km |
