Area code 660: Missouri
What is area code 660?
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. The code never shows a line is in service.
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See the phone add-onArea 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 |
In short: 660 is Missouri (Central Time). Format checks here are free and run in your browser; the current carrier and line type need a live lookup. Bulk phone number validator · Pro + Phone plan
Local time in area code 660
America/Chicago
Prefixes in service
514 of 792 possible
224 rate centers
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
- Bulk phone number validator
Format, country and number type for every number in a CSV, with E.164 output.
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- Area code time zone
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- 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.
Mobiles, landlines and VoIP lines share area codes, and numbers move between carriers. A live line-type and carrier lookup on every number in your list says which is which, and that decides which calling and texting rules apply. It's in the phone add-on.
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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.
- Does a valid format mean a 660 number is in service?
- No. A format check only says the digits fit the North American Numbering Plan and that 660 is an assigned code. It cannot tell whether the number is connected, who answers it or which carrier serves it today, because numbers are reassigned and ported. A live carrier lookup reports the current carrier and line type, but even that is not proof someone answers.
- Can I check a list of 660 numbers for free?
- Yes. Paste them in the list tab above or upload a CSV to the bulk phone number validator: format, E.164, country and the numbering-plan line type are free for every row, with no account. Live carrier and line-type lookups come with Pro + Phone at $49.99/mo (5,000 a month).
Other area codes in Missouri
All Missouri area codes on the area code index.
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.