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Where is the 303 Area code?
The 303 area code serves the Denver metropolitan area and parts of north-central Colorado, including major cities like Denver, Boulder, and Aurora. It is part of an overlay with area codes 720 and the newer 983. The area code is widely used by residents, businesses, and local institutions to maintain reliable communication and strengthen local presence.
Key Locations within the 303 Area Code:
- Major Cities: Denver, Aurora, Lakewood, Thornton, Arvada, Westminster, Centennial, Boulder, Highlands Ranch, Longmont, Broomfield, Castle Rock, Commerce City, Parker, Littleton, Northglenn, Brighton, Ken Caryl, Dakota Ridge, Englewood.
- Counties (partial or complete coverage): Denver, Arapahoe, Jefferson, Adams, Boulder, Douglas, Broomfield, Weld, Elbert, Clear Creek, Gilpin, Park.
Time Zone
The 303 area code, covering the Denver metropolitan area and parts of north-central Colorado, follows the Mountain Time Zone (MT). This includes Mountain Standard Time (MST, UTC−7 / GMT−7) in the winter and Mountain Daylight Time (MDT, UTC−6 / GMT−6) in the summer. Residents and businesses in this region generally follow this time zone to stay aligned with official local time.
303 Area Code In Colorado
Colorado is located in the western United States and covers approximately 104,185 sq mi (269,837 km²). The state uses several area codes, including 303/720/983, 719 and 970/748. The 303 area code primarily serves the Denver metropolitan area, with a population of over 3 million. It is overlaid by the 720 and 983 area codes to accommodate the region’s growing demand for phone numbers.
The 303 area code region supports a dynamic and service-driven economy, led by technology, aerospace, healthcare, finance, green energy, and outdoor recreation. Major employers include Lockheed Martin, University of Colorado Boulder, Denver Health, and Centura Health, alongside a thriving startup ecosystem and research institutions, all contributing to the region’s strong economic growth, skilled workforce, and local business development.
The 303 area code facilitates everyday communication for residents, businesses, and organizations across the Denver metro and surrounding regions. With the 720 and 983 overlays, it continues to accommodate the growing demand for phone numbers while maintaining reliable connectivity throughout central Colorado.
History of 303 Area Code
The 303 area code was established in 1947 as Colorado’s first and only area code, covering the entire state. In 1988, the southeastern portion of the state, including Colorado Springs and Pueblo, was split off to create area code 719. Later, in 1995, the northern and western regions were separated to form area code 970, leaving 303 focused on the Denver metropolitan area. To meet growing demand for phone numbers, area code 720 was introduced as an overlay in 1998, followed by a second overlay, 983, in 2022. Today, 303 continues to serve Denver and the surrounding Front Range communities alongside its two overlays.
Search 303 Area Code Virtual Phone Numbers
Explore the virtual 303 phone numbers list. Select one and get access to Denver’s fascinating and diverse environment.
Some numbers may require proof Of ID and address registration according to local laws. Certain numbers also require A2P 10DLC registration to send SMS and MMS messages to the United States. Some Phone Numbers May Not Be Available Through This Search, As They Are Not Generally Offered To Customers. These Numbers Are Available On Order Request. Please Contact Support To Request Them.
How Does a 303 Phone Number Work for Your Business?
A 303 area code phone number works for a business by providing a local, 10-digit number under the North American Numbering Plan (NANP). It connects customers across Denver and central Colorado easily via landlines, mobile phones, or VoIP platforms. This helps establish a strong local presence and ensures businesses are easily reachable.
Calls to a 303 area code number follow 10-digit dialing due to the overlay with area codes 720 and 983. Local callers in Denver and nearby cities dial the area code plus the seven-digit number, while long-distance calls within Colorado use 1 + 303 + the number. Furthermore, international callers can reach businesses using the format +1 (303) XXX-XXXX.
Businesses in this region can get a 303 area code number via landlines, mobile carriers, or virtual number services like Calilio. Among these options, virtual numbers are particularly beneficial for businesses, as they provide features such as call forwarding, Unified Callbox, CRM Integration and Call Sentiment Analysis. These tools help manage customer calls efficiently and strengthen local presence.
303 Nearby Area Codes
Key Features of a 303 Area Code Business Phone Number
How to Get a Phone Number With Area Code 303?
You can get a 303 area code phone number through any virtual provider. Just sign up on Calilio and follow the setup steps.
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Create a Calilio account with basic details & log in to your dashboard.
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Navigate to the left sidebar & click the plus symbol (+) located next to the Number section.
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You will land on the My Number page; here, select the Country for your virtual number.
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Select the Number Type and then choose the Capabilities (SMS, Voice, MMS).
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Scroll down, choose an available number from the list, and click the Add to Cart button.
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In the final step, enter your name and click Confirm Purchase from the cart to complete payment and activate your virtual number.
Already Have a 303 Phone Number for Business?
Do you already have a 303 phone number and want to port it? If yes, then choosing Calilio can be a great strategic choice.
Why Does Your Business Need a 303 Area Code Number?
The area code 303 helps uplift your firm’s market value by providing several benefits for your enterprises. It establishes customer trust, makes your institution look local, and supports community engagement.
Immediate Brand Recognition
Cost-Effective Calls
Improve Customer Trust
Scalability
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Frequently Asked Questions
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