M-173 was the designation given to two former state trunklines in the U.S. state of Michigan:
- M-173 (1930s Michigan highway) near Orleans in Ionia County
- M-173 (1939–1972 Michigan highway) in Menominee
| Browse numbered routes | ||||
|---|---|---|---|---|
←  M-172 | MI | →  M-174 | ||
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