Area code
660
660 is a United States area code. Under the North American Numbering Plan it belongs to Missouri, which has 9 area codes in total.
Validate a number in 660
Paste a full number and the tool checks it against the numbering plan. It returns the standard formats, the line type the plan assigns and the area code region.
Digits with or without punctuation work. Numbers outside the US are read with the +country code.
Area code 660 at a glance
NANPA lists 514 central office codes (prefixes) in use in area code 660, held by 52 holders across 224 rate centers.
| Fact | Value |
|---|---|
| In service since | 1997-10-12 |
| Time zone | Central (C) |
| Prefixes in use | 514 |
| Pooled prefixes | 404 (79%) |
| Rate centers | 224 |
| Companies holding prefixes | 52 |
| Assignment dates on file | 2001-01-18 to 2026-05-06 (154 prefixes) |
| ZIP codes in its places | 179 |
Rate centers in area code 660
| Rate center | Prefixes | Share |
|---|---|---|
| SEDALIA | 23 | 4% |
| KIRKSVILLE | 15 | 3% |
| WARRENSBG | 14 | 3% |
| CLINTON | 12 | 2% |
| MARYVILLE | 10 | 2% |
| MOBERLY | 10 | 2% |
| CHILLICOTH | 9 | 2% |
| MARSHALL | 9 | 2% |
| 216 other rate centers | 412 | 80% |
Who holds the prefixes in 660
Level 3 Communications holds the most prefixes, 62 (12%). 79% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
| Holder | Prefixes | Share |
|---|---|---|
| Level 3 Communications | 62 | 12% |
| Centurylink | 46 | 9% |
| Onvoy | 40 | 8% |
| Southwestern Bell | 40 | 8% |
| Grand River Mutual Tel | 36 | 7% |
| New Cingular Wireless PCS | 34 | 7% |
| 46 other carriers | 256 | 50% |
A prefix holder is the company a code was assigned to, not necessarily a number's current carrier, because numbers can be ported to another company. Find which carrier a number is on, or browse the prefix holders.
History of area code 660
- 1947-01-01 Area code 816, named as the parent of 660 in the NANPA report, was in service.
- 1997-10-12 Area code 660 went into service.
Area codes nearest to 660
Distance is measured between the centers of the ZIP code places each area code serves, so it is a rough guide.
ZIP codes in area code 660
179 ZIP codes fall in places that have a rate center in this area code.
| Place | ZIP codes |
|---|---|
| Sedalia, MO | 2 |
| Albany, MO | 1 |
| Allendale, MO | 1 |
A ZIP code and an area code are unrelated systems. A ZIP code can sit in more than one area code, and an area code spans many ZIP codes.
Complaints on file for 660 numbers
588 FCC complaints are on file for 452 numbers in 660, most often filed as "Unwanted Calls". These are unverified consumer reports.
| Year of latest complaint | Numbers |
|---|---|
| 2023 | 19 |
| 2024 | 36 |
| 2025 | 29 |
Other area codes in Missouri
Missouri is one state with 9 area codes in the NANPA table. 660 is one of them.
Next to 660 in the numbering table
These are the codes just before and after 660 when all are sorted by number. They are neighbours on the list, not necessarily on the map.
What the area code does and does not tell you
A number that starts with 660 was first assigned in Missouri. That is a fact about where the number began, and it is a useful hint when you check a form entry, for example a billing address in Missouri next to a 660 phone number.
It does not show where the person is today. A number stays with its owner after a move or a change of provider (number portability), and mobile numbers travel with the handset. The area code also cannot tell you whether the line is active, who the carrier is, or whether the number is mobile or fixed: the plan shares those ranges. Read more about the area code, the numbering plan and line type.
Check numbers in bulk with the API
| Product | Credits | Docs |
|---|---|---|
| Phone Numbering-Plan Validation | 1 credit per valid number | API docs |
| Phone Intelligence (carrier and line status) | 1 credit per check (invalid numbers outside the US and Canada are free) | Product page |
Questions about area code 660
Where is area code 660?
NANPA assigns area code 660 to Missouri, United States.
In which state does area code 660 sit?
Missouri. 660 is one of 9 area codes the NANPA table assigns to the state.
Which places does area code 660 cover?
The places with the most ZIP codes among the rate centers in 660 are Sedalia, MO, Albany, MO and Allendale, MO. The rate center list on this page shows all of them.
Who owns area code 660?
NANPA assigns area codes. Within 660, Level 3 Communications holds the most prefixes, 62 prefixes or 12%.
Which time zone does 660 use?
The NANPA NPA report lists the time zone for 660 as Central (C).
What year did 660 enter service?
The NANPA NPA report gives an in-service date of 1997-10-12, so 660 has been in use since 1997.
Does area code 660 have an overlay?
The NANPA NPA report lists no other area code in an overlay with 660.
Which area codes are nearest to 660?
The area codes closest to 660, measured between the centers of the ZIP code places they serve, are 816 (about 66 miles), 975 (about 71 miles), 913 (about 92 miles), 235 (about 139 miles) and 641 (about 153 miles).
How many prefixes does area code 660 have?
NANPA's report dated 2026-10-17 lists 514 prefixes in service in 660, spread over 224 rate centers and 52 holders.
Are there complaints about 660 numbers?
The FCC data on file has 588 complaints for 452 numbers in 660. They are unverified consumer reports. A number with no complaints on file is not proven safe.
Area code assignments: North American Numbering Plan Administrator NPA report, file dated 10/17/2026, retrieved 2026-10-17. Source file. New codes are assigned several times a year. Prefixes, rate centers, holders, time zone, in-service date and overlays: NANPA central office code report dated 2026-10-17 and NPA report dated 2026-10-18. Complaints: FCC consumer complaints open data, fetched 2026-10-17. ZIP code places: Postal code places and coordinates: GeoNames (geonames.org), licensed CC BY 4.0.