Interstate 69 Business (Port Huron, Michigan)
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| Location: | Coldwater |
| Length: | 5.202 mi (8.372 km) |
| Existed: | 1967–present |
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| Location: | Charlotte |
| Length: | 4.891 mi (7.871 km) |
| Existed: | 1974–present |
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| Location: | Lansing–East Lansing |
| Length: | 14.591 mi (23.482 km) |
| Existed: | 1987–present |
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| Location: | Port Huron |
| Length: | 3.077 mi (4.952 km) |
| Existed: | 1984–present |
There are currently four business routes of Interstate 69 (I-69) in the US state of Michigan. Designated Business Loop Interstate 69 (BL I-69), they are all former routings of I-69's predecessor highways, US Highway 27 (US 27), M-78 or M-21, in whole or in part. The BL I-69 in Coldwater and the one in Charlotte were both parts of US 27 before the freeway bypassed those two cities in 1967 and the early 1970s, respectively. The BL I-69 through Lansing and East Lansing was previously part of M-78 and Temporary I-69 until it was redesignated in 1987. Before 1984, the loop in Port Huron was originally part of M-21 and was initially a business spur numbered Business Spur Interstate 69 (BS I-69). It was later redesignated when it was extended to run concurrently with that city's BL I-94 which was originally part of I-94's predecessor, US 25. Each business loop follows streets through each city's downtown areas and connects to I-69 on both ends, giving traffic a route through the downtown and back to the freeway.
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