| Business | Phone |
| Genoa Oceola Wastewater Trtmnt 890 Chilson Rd, Howell 48843 | (517) 548-9400 |
| Genoa Twp Office 3508 Woodridge Dr, Howell 48843 | (517) 546-9733 |
| Oceola Twp Hall 1577 N Latson Rd, Howell 48843 | (517) 546-3259 |
| Hartland Senior Ctr 9525 E Highland Rd, Howell 48843 | (810) 746-2135 |
| Mason Township Sewer System 3345 Mason Rd, Howell 48843 | (517) 545-3001 |
| Howell Building & Zoning 611 E Grand River Ave, Howell 48843 | (517) 546-3861 |
| Howell City Downtown Dev 611 E Grand River Ave, Howell 48843 | (517) 545-4240 |
| Howell City Office 603 Roosevelt St, Howell 48843 | (517) 540-1453 |
| Howell Township Hall 3525 Byron Rd, Howell 48855 | (517) 546-2817 |
| Marion Township Hall 2877 W Coon Lake Rd, Howell 48843 | (517) 546-1588 |