North American Numbers Source-cited · ownership disclosed
Area code
660
In service
United States · since 1997

Northern / western Missouri

Split from 816 in 1997, area code 660 serves rural northern and western Missouri outside the Kansas City metro. It has no overlay.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Northern / western Missouri
Type
geographic
Status
in service
In service since
1997
Projected exhaust
2103 Q2

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 660 is

Northern and western Missouri surrounding the Kansas City metro..

Communities served wholly or partly by 660:

SedaliaKirksvilleWarrensburgMaryvilleChillicotheMarshallMoberly
B · Relationships

How it relates to other codes

The codes 660 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

Split from · 1997 816 Kansas City 660 split from 816, taking the rural remainder.
Related · 1996 573 Columbia / Jefferson City / eastern Missouri Adjacent eastern Missouri.
Related · 1950 417 Springfield / southwestern Missouri Adjacent southwestern Missouri.
What's changing. No overlay; not approaching exhaustion (projected ~Q3 2043).
C · History

How 660 got here

1997-10-12
Created by geographic split of 816 amid cell-phone growth.
Source: Wikipedia
2021-10
Transitioned to 10-digit dialing ahead of the 988 hotline rollout.
Source: Wikipedia
D · Capacity

How full it is

Prefixes assigned
531
Prefixes available
269
Thousands-blocks assigned
1,647

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 660 with another code →
Sources
Wikipedia ↗
Area code 660
NumberResearch.org ↗
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.