---
title: "Area code 660: Missouri, United States"
url: "https://lookvalid.com/area-code/660.md"
canonical_url: "https://lookvalid.com/area-code/660"
last_updated: "2026-10-23"
type: "reference"
summary: "Area code 660 serves Missouri, United States. Number formats, numbering rules, a live phone validator and the other codes in Missouri."
---

# Area code 660: Missouri, United States

Area code 660 serves Missouri, United States. Number formats, numbering rules, a live phone validator and the other codes in Missouri.

NANPA lists 514 central office codes (prefixes) in use in area code 660, held by 52 holders across 224 rate centers.
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.
The FCC unwanted-call data has 588 complaints on file for 452 numbers in 660, most often filed as "Unwanted Calls". These are consumer reports, not findings.

## Facts

- 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

| 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% |

## Carriers

| 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.

## History

- 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.

## Nearest area codes

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).

## ZIP codes

179 ZIP codes fall in places that have a rate center in this area code. The places with the most are Sedalia, MO (2 ZIP codes), Albany, MO (1 ZIP code) and Allendale, MO (1 ZIP code). A ZIP code and an area code are unrelated systems, so a ZIP code can sit in more than one area code and an area code spans many ZIP codes.

## Complaints on file

588 complaints for 452 numbers. Numbers whose latest complaint falls in each year:

- 2023: 19
- 2024: 36
- 2025: 29

## Questions

### 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.

Sources: NANPA central office code report dated 2026-10-17; NANPA NPA report dated 2026-10-18; FCC unwanted-call complaints, data fetched 2026-10-17; ZIP code places from GeoNames (CC BY 4.0).