Missouri Area Codes

Area codes: 9
ZIP codes: 1,157
Cities & towns: 938
Counties and independent cities: 115

Every area code in Missouri

All Missouri area codes, what each primarily serves, and which share ground with another.
Area code	Primarily serves	Shares ground with	In service
235	Columbia	573	2024
314	Florissant	557	1947
417	Springfield	no overlay	1950
557	Florissant	314	2022
573	Columbia	235	1996
636	Chesterfield	no overlay	1999
660	Sedalia	no overlay	1997
816	Kansas City	975	1947
975	Kansas City	816	2023

A code in the “shares ground” column is an overlay: it covers the same territory rather than a different part of Missouri, which is why local calls there are dialled as ten digits.

Which codes share the same ground

Missouri has 3 groups of codes that overlay one another: the codes inside a group cover the same territory rather than different parts of the state, so local calls there are dialled as ten digits.

417, 636 and 660 have no overlay: each is the only code serving its own territory.

Where Missouri's communities sit

Each point is a Missouri community, plotted from its record coordinates. The outline is the convex envelope of those points — a footprint, not a boundary.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Largest Missouri cities and their codes

largest 25

Scope every area code assigned to Missouri. Source LocalCallingGuide NPA list (2026-07 NPA list) and geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot). Updated 16 July 2026. Overlay relationships come from the numbering-plan authority; the city match is computed.