| Business | Phone |
| Ingham County Women's Comm Po Box 319, Mason 48854 | (517) 676-7200 |
| Clerk To The Board 315 S Jefferson St, Mason 48854 | (517) 676-7204 |
| Cooperative Extension Svc 121 E Maple St, Mason 48854 | (517) 676-7207 |
| Register Of Deeds 341 S Jefferson St, Mason 48854 | (517) 676-7216 |
| Road Commission Permits 301 N Bush St, Mason 48854 | (517) 676-2200 |
| Honorable Michael G Harrison 407 N Cedar St, Mason 48854 | (517) 483-6500 |
| Honorable Thomas E Brennan 700 Buhl St, Mason 48854 | (517) 676-8402 |
| Ingham Cnty Budget Office 121 E Maple St, Mason 48854 | (517) 676-7217 |
| Ingham Cnty Drain Commissioner 707 Buhl St, Mason 48854 | (517) 676-8395 |
| Ingham Cnty Treasurer's Office 341 Jefferson St, Mason 48854 | (517) 676-7220 |
| Ingham County Adm Svc & Budget 121 E Maple St, Mason 48854 | (517) 676-7231 |
| Ingham County Commissioners Bd Mason 48854 | (517) 676-0401 |
| Ingham County Controller's Ofc 341 S Jefferson St 101, Mason 48854 | (517) 676-7206 |
| Ingham County Courthouse Mason 48854 | (517) 483-6500 |
| Ingham County Tax Mapping 341 S Jefferson St, Mason 48854 | (517) 676-7212 |
| Ingham County Facilities Dept 121 E Maple St, Mason 48854 | (517) 676-7312 |
| Ingham County Fairgrounds 700 E Ash St, Mason 48854 | (517) 676-2428 |
| Ingham County Financial Svc 121 E Maple St, Mason 48854 | (517) 676-7329 |
| Ingham County Jury Adm 121 E Maple St, Mason 48854 | (517) 676-7370 |
| Ingham County Management Info 121 E Maple St, Mason 48854 | (517) 676-7373 |
| Ingham County Pre Trial Svc 630 Cedar St, Mason 48854 | (517) 676-8282 |
| Ingham County Purchasing 121 E Maple St, Mason 48854 | (517) 676-7215 |
| Ingham County Purchasing Dept 121 E Maple St, Mason 48854 | (517) 676-7222 |
| Ingham County Road Commission 301 N Bush St, Mason 48854 | (517) 676-9722 |
| Ingham Historical Commission 121 E Maple St, Mason 48854 | (517) 676-7213 |