A 303 number is the classic Denver code, recognized from Boulder to Aurora and Lakewood. Allo pairs it with an AI receptionist that answers every call, plus recordings, summaries and CRM sync.
Covers: Denver, Boulder, Aurora, Lakewood (Denver Metro) · Get a Denver number
Along the Front Range, 303 carries real hometown weight.
Denver mixes energy, aerospace, tech and a huge outdoor industry, Boulder is a university and startup town, and Aurora and Lakewood fill out the metro with busy suburbs. From LoDo offices to foothill contractors, customers here like working with people who know Colorado. A 303 caller ID tells them you do.
303 dates from 1947, and 720 and 983 were added later as overlays.
All three codes serve Denver, Boulder, Aurora and Lakewood, so each one is local across the metro. Because 303 is so established, new numbers are usually issued on 720 or 983. Colorado Springs and the south use 719, while the rest of the state uses 970.
Allo gives your 303 line an AI receptionist and a perfect memory.
The AI receptionist answers 24/7, handles common questions and routes callers to the right teammate. Every call is recorded and summarized, and contacts and notes sync to HubSpot, Salesforce or Pipedrive on their own. Text customers from the same number and work from the desktop or mobile app wherever you are.
A 303 area code gets you picked up. Allo handles what happens next, on every call.
A local area code your prospects recognize means more calls get answered and more callbacks come through.
The AI receptionist picks up when your team can't, answers questions, qualifies the lead and books the meeting.
Ring your team together or one after another, with business texting built in, so no call slips through.
Recording, summary and next steps land in your CRM automatically, so follow-up is done before you hang up.
Same region, same setup. Pick the prefix your customers know.
Tell us the number you have in mind. If it is available, we will set it aside for you. If it is already yours, we will move it to Allo for you.
Ask for a numberArea code 303 covers the Denver metro area of Colorado, including Denver, Boulder, Aurora and Lakewood. It shares this area with the 720 and 983 overlays.
The 303 area code is in the Mountain Time zone, observing MST in winter and MDT during daylight saving time.
No. Allo lets you get a virtual number for the 303 area from anywhere, with no Colorado office or address required.
All three cover the same Denver metro and read as local. 303 is the original and the most familiar, so availability is limited, while 720 and 983 usually have more open numbers. If you already have a 303 number, you can port it to Allo.
