Area code 660: Missouri
Area code 660 is a US state area code for Missouri, on Central Time. It has 514 prefixes in service across 224 rate centers, the largest being Sedalia, Kirksville and Warrensburg. NANPA lists no overlay code for it. Local calls there take 10 digits.
Local time in area code 660
America/Chicago
Prefixes in service
514 of 792 possible
224 rate centers
Area code 660 facts
| Location | Missouri, United States |
|---|---|
| Time zone | Central Time |
| Overlays | None |
| Split from | 816 |
| In service since | October 12, 1997 |
| Local calls | 10 digits; toll calls 1 + 10 digits |
| Carrier | Not shown. An area code is where a number was issued; numbers port between carriers. Check line type |
Which cities and towns use area code 660?
NANPA records each prefix against a rate center, the local billing area a number belongs to, usually named after its main town. These are the 660 rate centers with the most prefixes in service. 212 smaller ones aren't listed.
| Rate center | Prefixes |
|---|---|
| Sedalia | 23 |
| Kirksville | 15 |
| Warrensburg | 14 |
| Clinton | 12 |
| Maryville | 10 |
| Moberly | 10 |
| Marshall | 9 |
| Chillicothe | 9 |
| Butler | 6 |
| Warsaw | 6 |
| Trenton | 6 |
| Boonville | 6 |
Source: NANPA central office code assignments, file dated 10/17/2026. Each prefix holds up to 10,000 numbers.
How do I dial a 660 number?
NANPA's dialling plan for 660: local calls inside the code take 10 digits, toll calls 1 + 10 digits. From another area code, dial 1 first. From abroad, use +1. The examples use 555-0147, from a range reserved for fictional numbers.
| Local call inside 660 | 660-555-0147 |
|---|---|
| From another US or Canadian area code | 1-660-555-0147 |
| From outside North America | +1 660 555 0147 |
| E.164, for CRMs and SMS tools | +16605550147 |
When did area code 660 start?
Area code 660 went into service on October 12, 1997, split from 816. It has no overlay, so every number in its area still starts with it.
Tools for 660 numbers
- Area code lookup
Look up any code or a whole list of numbers, or find the codes for a state or city.
- Area code time zone
Local time for a list of numbers, with a callable-now flag.
- NPA-NXX lookup
Rate center and state for one prefix, a level below the area code.
- TCPA calling hours checker
Whether it's inside the federal 8 a.m. to 9 p.m. calling window there now.
Next step
A 660 number tells you where it was issued, not what it is now.
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Area code 660 questions
- What state is area code 660?
- Area code 660 is in Missouri, United States. Its largest rate centers by number of prefixes are Sedalia, Kirksville, Warrensburg, Clinton and Maryville.
- What time zone is area code 660 in?
- Central Time.
- Does area code 660 have an overlay?
- Not as of NANPA's file dated 10/16/2026. Every number in its area uses 660.
- When did area code 660 start?
- Area code 660 went into service on October 12, 1997, split from 816.
- Is a 660 number a cell phone or a landline?
- The area code can't tell you. In the US and Canada mobiles, landlines and VoIP lines share area codes and prefixes, and numbers move between carriers and line types. Only a live line-type lookup answers it for one number.
- How many phone numbers does area code 660 have?
- 514 of its 792 possible prefixes are in service, and each prefix holds up to 10,000 numbers. That counts prefixes assigned to carriers, not numbers in use.
Other area codes in Missouri
Sources
Location, overlays, in-service date and dialling plan: NANPA NPA database, file dated 10/16/2026. Prefixes and rate centers: NANPA central office code assignments, 10/17/2026. Time zones mapped to the IANA time zone database. By the SimpleVerifier Team; how we build these pages.