M-21A (Michigan highway)
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M-21 is highlighted in red
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| Route information | |||||||
| Maintained by MDOT | |||||||
| Length: | 99.322 mi (159.843 km) | ||||||
| Existed: | c. July 1, 1919 – present | ||||||
| Major junctions | |||||||
| West end: |
  M-37 / M-44 in Grand Rapids
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 I-75 near Flint
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| East end: |
 I-475 in Flint |
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| Location | |||||||
| Counties: | Kent, Ionia, Clinton, Shiawassee, Genesee | ||||||
| Highway system | |||||||
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| Location: | Flint–Davison |
| Length: | 9.033 mi (14.537 km) |
| Existed: | 1929–Late 1948 |
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| Location: | Kent County |
| Length: | 12.005 mi (19.320 km) |
| Existed: | By 1945–1953 |
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| Location: | Grandville–Grand Rapids |
| Length: | 6.749 mi (10.861 km) |
| Existed: | 1953–1974 |
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| Location: | Genesee County |
| Length: | 12.726 mi (20.481 km) |
| Existed: | 1971–1984 |
M-66 in Ionia
US 127 near St. Johns
M-52 in Owosso
M-13 near Lennon
M-21 is an east–west state trunkline highway in the US state of Michigan connecting the cities of Grand Rapids and Flint. The highway passes through rural farming country and several small towns along its course through the Lower Peninsula. Following the course of a handful of rivers, M-21 also connects some of the state's freeways like Interstate 96 (I-96), US Highway 127 (US 127) and I-75. The highway is used by between 1,700 and 36,000 vehicles daily.
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