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| Missouri State Highway System | |
|---|---|
    Highway markers for Interstate 44, U.S. Route 61, Missouri Route 5 and Supplement Route A | |
| System information | |
| Maintained byMoDOT | |
| Highway names | |
| Interstates | Interstate nn (I‑nn) |
| US Highways | U.S. Route nn (US nn) |
| State | Route nn |
| Supplemental Route: | Supp-xx, SSR-xx |
| System links | |
InMissouri, odd-numbered highways run north-south and even-numbered highways run east-west (with a few exceptions, such as Route 112). Missouri also maintains a secondary set of roads,supplemental routes, which are lettered rather than numbered.
Missouri has also changed highway designations with a US route or aninterstate with the same number is designated through the state (Route 40 was redesignatedRoute 14 to avoid duplicating numbers withUS-40 which also passes through the state). There are a few instances of number duplication between federal and state highways (such as withRoute 72 andI-72), but any such pairs of highways are nowhere near each other to avoid confusion.
In some states (such asArkansas andNew Mexico), highways are allowed to be discontinuous. Missourioverlaps highways in order to maintain continuity.
TheMissouri Department of Transportation routinely uses the term "Route" in reference to the names of the roads. However, Missouri statutes define them as "State Highways". Missourians may use the terms "Route" and "Highway" interchangeably when referring to a state road.
