Area code 970: Colorado
What is area code 970?
Area code 970 is a US state area code for Colorado, on Mountain Time. It has 771 prefixes in service across 120 rate centers, the largest being Fort Collins, Greeley and Grand Junction. It shares its area with 748, so local numbers there can start with any of them. Local calls there take 10 digits.
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See the phone add-onArea code 970 facts
| Location | Colorado, United States |
|---|---|
| Time zone | Mountain Time |
| Overlays | 748 |
| Split from | 303 |
| In service since | April 2, 1995 |
| 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: 970 is Colorado (Mountain 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 970
America/Denver
Prefixes in service
771 of 792 possible
120 rate centers
Which cities and towns use area code 970?
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 970 rate centers with the most prefixes in service. 108 smaller ones aren't listed.
| Rate center | Prefixes |
|---|---|
| Fort Collins | 95 |
| Greeley | 62 |
| Grand Junction | 57 |
| Loveland | 35 |
| Durango | 29 |
| Vail | 24 |
| Glenwood Springs | 21 |
| Montrose | 19 |
| Aspen | 17 |
| Dillon | 17 |
| Steamboat Springs | 14 |
| Sterling | 12 |
Source: NANPA central office code assignments, file dated 10/17/2026. Each prefix holds up to 10,000 numbers.
How do I dial a 970 number?
NANPA's dialling plan for 970: 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 970 | 970-555-0147 |
|---|---|
| From another US or Canadian area code | 1-970-555-0147 |
| From outside North America | +1 970 555 0147 |
| E.164, for CRMs and SMS tools | +19705550147 |
When did area code 970 start?
Area code 970 went into service on April 2, 1995, split from 303. Today 970 and 748 cover the same area as an overlay, which is why 10-digit dialling is needed for local calls there.
Tools for 970 numbers
- Bulk phone number validator
Format, country and number type for every number in a CSV, with E.164 output.
- 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 970 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 970 questions
- What state is area code 970?
- Area code 970 is in Colorado, United States. Its largest rate centers by number of prefixes are Fort Collins, Greeley, Grand Junction, Loveland and Durango.
- What time zone is area code 970 in?
- Mountain Time.
- What area codes overlay 970?
- 748. An overlay adds a new code to the same area instead of splitting it, so neighbours can have different area codes and local calls need 10 digits.
- When did area code 970 start?
- Area code 970 went into service on April 2, 1995, split from 303.
- Is a 970 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 970 have?
- 771 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 970 number is in service?
- No. A format check only says the digits fit the North American Numbering Plan and that 970 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 970 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 Colorado
All Colorado 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.