About Colorado Area Code 720

The 720 area code includes Colorado cities Arvada, Aurora, Boulder, Brighton, Broomfield, Castle Rock, Deer Trail, Denver, Englewood, Evergreen, Fort Lupton, Georgetown, Golden, Grant, Greeley, Kiowa, Lafayette, Lakewood, Larkspur, Littleton, Longmont, Nederland, Parker, Roggen, Westminster.

Nearby area codes are 303, 307, 719 and 970.
Search for a phone number:
Example: 720-555-5555

Extended information

Area codes 720 and 303 are telephone area codes serving the state of Colorado. They cover Boulder, Longmont, Aurora, Denver, Highlands Ranch and other areas in central Colorado. Area code 720 is overlaid with area code 303, meaning that the same physical service area is served by both area codes (720 and 303) and that 10-digit dialing is required for all calls made within the service area.

Originally, all of Colorado was served by the 303 area code but as the population grew, an impending phone number shortage forced a split of the state's area codes. 719 was split from 303 on March 5, 1988, and 970 was split from the remaining 303 area on April 2, 1995, leaving 303 to cover its current area. 303 was overlaid with 720 on June 1, 1998.

With one exception (the Roggen area, which has local calling only with itself, Brighton, and Wiggins), the entire 720/303 area is a local calling zone, so long distance is not applied to any calls made from one phone to another within the area.

With the exception mentioned above, all users in the 720/303 area code must dial all ten digits to reach a destination phone, even if that phone is next door.

720 Area Code Exchanges 100-153:

720-100-xxxx    720-101-xxxx    720-102-xxxx    720-103-xxxx    720-104-xxxx    720-105-xxxx    720-106-xxxx    720-107-xxxx    720-108-xxxx    720-109-xxxx    720-110-xxxx    720-111-xxxx    720-112-xxxx    720-113-xxxx    720-114-xxxx    720-115-xxxx    720-116-xxxx    720-117-xxxx    720-118-xxxx    720-119-xxxx    720-120-xxxx    720-121-xxxx    720-122-xxxx    720-123-xxxx    720-124-xxxx    720-125-xxxx    720-126-xxxx    720-127-xxxx    720-128-xxxx    720-129-xxxx    720-130-xxxx    720-131-xxxx    720-132-xxxx    720-133-xxxx    720-134-xxxx    720-135-xxxx    720-136-xxxx    720-137-xxxx    720-138-xxxx    720-139-xxxx    720-140-xxxx    720-141-xxxx    720-142-xxxx    720-143-xxxx    720-144-xxxx    720-145-xxxx    720-146-xxxx    720-147-xxxx    720-148-xxxx    720-149-xxxx    720-150-xxxx    720-151-xxxx    720-152-xxxx    720-153-xxxx    
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