Missouri area codes

Codes in service in Missouri

Missouri has 9 geographic area codes in service: 235, 314, 417, 557, 573, 636, 660, 816, 975. 314 is the oldest, dated 1947, and 235 the newest, dated 24 Mar 2024.1 All of Missouri's codes are on Central time.

Area code	NANPA location	NPA in-service date	In-service overlay peers	Time zone	Local calls within the code
235	MO	24 Mar 2024	573	Central	10 digits
314	MO	1947	557	Central	10 digits
417	MO	1950	None listed	Central	10 digits
557	MO	12 Aug 2022	314	Central	10 digits
573	MO	7 Jan 1996	235	Central	10 digits
636	MO	22 May 1999	None listed	Central	7 digits
660	MO	12 Oct 1997	None listed	Central	10 digits
816	MO	1947	975	Central	10 digits
975	MO	13 Oct 2023	816	Central	10 digits

Scroll the table sideways to see every column. Sources: NANPA (14 October 2026 file).

History and overlays in Missouri

Before 1960: 314 (1947), 816 (1947), 417 (1950)
1990s: 573 (7 Jan 1996), 660 (12 Oct 1997), 636 (22 May 1999)
2020s: 557 (12 Aug 2022), 975 (13 Oct 2023), 235 (24 Mar 2024)

Missouri's in-service overlay groups are 235/573; 314/557; 816/975.1

816/975: 816 (1947) was joined by 975 on 13 Oct 2023.
314/557: 314 (1947) was joined by 557 on 12 Aug 2022.
235/573: 573 (1996) was joined by 235 on 24 Mar 2024.

Dialing in Missouri

Local calls within a single area code in Missouri differ: 7 digits for 636; 10 digits for 235, 314, 417, 557, 573, 660, 816, 975. From any of Missouri's codes, local calls to another area code are all recorded as 10 digits.1 Seven-digit local dialing is still recorded for 636.

Neighbours of Missouri

Regions that border Missouri:

Arkansas: 4 codes (327, 479, 501, 870)
Illinois: 17 codes (217, 224, 309, 312, ...)
Iowa: 5 codes (319, 515, 563, 641, ...)
Kansas: 4 codes (316, 620, 785, 913)

Rules that apply to every region are on the area-code reference.

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Sources

Every regulatory and pricing claim on this page links to the primary source it came from. Figures were checked on the date shown at the top of the page; rules and prices change, so verify before relying on one.

NANPA, NPA Database CSV, file dated 14 October 2026; US geographic codes, location, dates, overlay complexes, dialing plan and time zone. Retrieved 14 Oct 2026
https://reports.nanpa.com/public/npa_report.csv