| Route 139 | ||||
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| Route information | ||||
| Maintained by MoDOT | ||||
| Length: | 107 mi (172 km) | |||
| Major junctions | ||||
| South end: |
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| North end: | Wayne CR S40 in Iowa state line | |||
| Highway system | ||||
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Route 139 is a highway in northern and central Missouri. Its northern terminus is at the Iowa state line where it continues as Wayne County Route S40; its southern terminus is at U.S. Route 24 east of Carrollton.