M-12 (Michigan highway)
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| Location: | Ironwood–Sault Ste. Marie |
| Length: | 406.63 mi (654.41 km) |
| Existed: | c. July 1, 1919–November 11, 1926 |
M-12 is a former state highway in the Upper Peninsula of Michigan. It was replaced in 1926 by:
Since 1926, M-12 north of the St. Ignace area has been replaced by:
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