Colorado · Mountain Time
748 Area Code
Area code 748 is in Colorado, serving northern and western Colorado including Fort Collins, Greeley, Grand Junction and the mountain resorts. It is in the Mountain Time zone. It shares its territory with overlay code 970, so 10-digit dialing is required.
Last updated October 1, 2026 · Source: NANPA
Where is the 748 area code?
748 is a Colorado area code covering northern and western Colorado including Fort Collins, Greeley, Grand Junction and the mountain resorts. In the wider directory it sits in the West region.
Cities in the 748 area code
- Fort Collins
- Greeley
- Loveland
- Grand Junction
- Windsor
- Durango
- Montrose
- Sterling
- Fort Morgan
- Steamboat Springs
- Glenwood Springs
- Aspen
- Vail
- Estes Park
- Cortez
Counties served by 748
Larimer County, Weld County, Mesa County, La Plata County, Montrose County, Garfield County, Routt County, Eagle County, Pitkin County and Logan County.
748 overlay codes and dialing
The 748 territory is covered by an overlay of 2 area codes: 748, 970. All of them serve the same geographic area, and the original code is 970. Because more than one code covers the same ground, 10-digit dialing is mandatory — you must dial the area code for every local call. New phone lines may be assigned any of these codes.
History of the 748 area code
748 went into service on July 7, 2025 as an overlay of 970, relieving number exhaustion in the Fort Collins area. Rather than splitting the region, the overlay lets existing customers keep their numbers while new lines draw from the added code. Learn more in our overlay guide.
Is 748 a scam or spam risk?
748 is a legitimate geographic area code, not a premium or toll line, so a call from it costs you nothing extra. That said, scammers frequently spoof real local area codes to look familiar on caller ID. A genuine 748 number on your screen is no guarantee the caller is in Fort Collins, CO or trustworthy. See spam & scam-risk area codes for how spoofing works and how to respond.
Other Colorado area codes
Explore more
See every code in Colorado, compare codes across the West region, or view all Mountain Time codes. You can also browse the 7XX block or the complete numeric list of US area codes.
New to how this all works? Start with how area codes work, then read up on overlays, 10-digit dialing, and spam & scam-risk codes. To check another number, use the area code lookup tool.
Quick answers
748 area code FAQ
Where is the 748 area code?
The 748 area code is in Colorado, covering northern and western Colorado including Fort Collins, Greeley, Grand Junction and the mountain resorts, in the West region.
What cities are in the 748 area code?
Cities in the 748 area code include Fort Collins, Greeley, Loveland, Grand Junction, Windsor, Durango, Montrose, Sterling, Fort Morgan and Steamboat Springs.
What time zone is 748 in?
748 is in the Mountain Time zone.
What is the overlay for the 748 area code?
748 shares its territory with 970. Both codes (748, 970) serve the same area, so 10-digit dialing is required for every call.
When did the 748 area code start?
748 went into service on July 7, 2025 as an overlay of 970.
Do I have to dial 10 digits for 748?
Yes. Because 748 is an overlay area, you must dial the full 10-digit number (area code + 7 digits) for every call.
Is 748 a toll-free or premium code?
No. 748 is a standard geographic area code, so calling it costs the same as any local or long-distance call on your plan. Toll-free calls use 800, 888, 877, 866, 855, 844 or 833.