| SEGMENT | LENGTH | ROUTES | COUNTIES | FREEWAY |
| 39 | 7 | US-10 US-31 |
Mason | |
| 40 | 1 | M-20 M-37 |
Newaygo | |
| 41 | 1 | M-82 M-37 |
Newaygo | |
| 42 | 1 | M-2 US-131 |
Mecosta | |
| 43 | 1 | M-20 BR-27 |
Isabella | |
| 44 | 27 | US-23 I-75 |
Bay | Yes |
| 45 | 2 | BL-75 M-25 |
Bay | |
| 46 | 2 | M-53 M-142 |
Huron | |
| 47 | 5 | M-19 M-46 |
Sanilac | |
| 48 | 3 | M-19 M-90 |
Sanilac | |
| 49 | 2 | M-53 M-90 |
Lapeer | |
| 50 | 1 | M-21 M-24 |
Lapeer | |
| 51 | 2 | M-54 M-83 |
Saginaw | |
| 52 | 3 | M-21 M-13 |
Shiawasse Genesee |
|
| 53 | 11 | M-21 I-69 |
Genesee | Yes |
| 54 | 4 | M-66 M-46 |
Montcalm | |
| 55 | 18 | M-46 US-131 |
Montcalm Kent |
Yes |
| 56 | 2 | M-37 M-46 |
Muskegon Kent |
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