Founded in 1829 (boundaries declared) and 1838 (organized), Ingham County is one of 83 counties in the state of Michigan. Historically, Ingham County was formed from parts of Shiawassee County, Washtenaw County and unorganized territory. The city of Mason is the county seat. With FIPS code of 65, Ingham County has a population of 284,034 and area of 561 square miles (1,453 km2).
List of all cities in Ingham County, MI alphabetically
| City/Town | Postal Code | Area Code |
| Consumers Energy, MI | 48937 | 517 |
| Dansville, MI | 48819 | 517 |
| East Lansing, MI | 48823 | 517 |
| 48824 | 517 | |
| 48825 | 517 | |
| 48826 | 517 | |
| Haslett, MI | 48840 | 517 |
| Holt, MI | 48842 | 517 |
| Jackson National Life Ins Co, MI | 48951 | 517 |
| Lansing, MI | 48901 | 517 |
| 48909 | 517 | |
| 48910 | 517 | |
| 48911 | 517 | |
| 48912 | 517 | |
| 48913 | 517 | |
| 48915 | 517 | |
| 48916 | 517 | |
| 48918 | 517 | |
| 48919 | 517 | |
| 48921 | 517 | |
| 48922 | 517 | |
| 48924 | 517 | |
| 48929 | 517 | |
| 48930 | 517 | |
| 48933 | 517 | |
| 48937 | 517 | |
| 48950 | 517 | |
| 48951 | 517 | |
| 48956 | 517 | |
| 48980 | 517 | |
| Lansing State Journal, MI | 48919 | 517 |
| Leslie, MI | 49251 | 517 |
| Lucky Losers, MI | 48916 | 517 |
| Mason, MI | 48854 | 517 |
| Mi Department of Revenue, MI | 48922 | 517 |
| 48929 | 517 | |
| 48956 | 517 | |
| Michigan Bankard, MI | 48950 | 517 |
| Okemos, MI | 48805 | 517 |
| 48864 | 517 | |
| Oldsmobile, MI | 48921 | 517 |
| Onondaga, MI | 49264 | 517 |
| Secretary of State, MI | 48918 | 517 |
| State of Mich Dept Treasury, MI | 48930 | 517 |
| State of Michigan, MI | 48913 | 517 |
| Stockbridge, MI | 49285 | 517 |
| Vehicle License Plates, MI | 48980 | 517 |
| Webberville, MI | 48892 | 517 |
| Williamston, MI | 48895 | 517 |