Area code 303 was introduced in 1947 and serves Denver Metro, covering cities like Denver, Aurora, Lakewood. It sits in the Mountain (MT) zone and reaches a population of roughly 1.5M+.
With MeraTalk, you can get a 303 number for Colorado in minutes and run all your calls over the internet from any device.
A 303 number gives your business a genuine local footing in Colorado, and the benefits go well beyond a familiar caller ID.
Outbound reps dial Denver Metro prospects from a number those prospects recognize. A familiar 303 caller ID gets the conversation started instead of going to voicemail.
Give your Denver Metro customers a local number to call for help. Calls route to your support team wherever they sit, with queues, schedules, and an AI receptionist after hours.
Your team doesn't need to live in Colorado to answer a 303 number. Calls ring on laptops and mobiles anywhere, while customers see a hometown business.
Pair your 303 number with local numbers in other markets you serve. Each location keeps its own identity while every call lands in one shared MeraTalk workspace.
Area codes are added as a region's demand for phone numbers grows. Here's when each Colorado code came online — and where 303 fits in.
303 was the first of Colorado's current codes, assigned to Denver Metro and anchored by Denver. It remains the code most residents associate with Denver and Aurora.
As Southern Colorado grew, 719 was introduced to keep up with demand for new numbers around Colorado Springs and Pueblo. Existing numbers kept their codes — 719 simply opened fresh inventory for the area.
As Northern & Western Colorado grew, 970 was introduced to keep up with demand for new numbers around Fort Collins and Grand Junction. Existing numbers kept their codes — 970 simply opened fresh inventory for the area.
As Denver Metro (overlay) grew, 720 was introduced to keep up with demand for new numbers around Denver and Westminster. Existing numbers kept their codes — 720 simply opened fresh inventory for the area.
Make and receive calls and texts from your 303 number on desktop, mobile, or desk phone. One number for everything — no app-switching, no confusion.
Answers, screens, and routes every call to your 303 number around the clock — even when your team is offline or busy.
Every call and text to your 303 number is visible to the whole team — anyone can pick up, reply, or follow up.
Missed calls become readable transcripts delivered to your inbox.
Route Denver Metro callers to the right person on your schedule.
Already have a 303 number? Bring it — porting is on every plan.
4 area codes covering Colorado
Area code 303 is part of the North American Numbering Plan (NANP) — the system that assigns three-digit codes to geographic regions across the US, Canada, and parts of the Caribbean. Code 303 was assigned to Denver Metro and serves Denver and Aurora as its primary markets.
When a call is made to a 303 number, the carrier routes it through the Mountain (MT) time zone switching network. This also means that when customers see a 303 number on their caller ID, they immediately associate it with Denver Metro — before the call is even answered.
The area code on your caller ID shapes how customers in Denver Metro decide whether to pick up or ignore your call.
Calls from a local 303 number are far more likely to be answered than calls from an out-of-state or toll-free number. Customers in Denver Metro recognise the code and trust it as local.
A 303 number tells prospects in Colorado that you operate in their market — even if your team is fully remote or based elsewhere. First impressions happen before the first word.
With a cloud-hosted 303 number, your team can answer calls from any device, in any location. The local area code stays consistent while your team stays flexible.
West listed first
Explore other West area codes and find the right local number for every market you serve.
Set up your 303 number on MeraTalk, compare other US area codes, or read the public record for Denver Metro.
Read the in-depth guide to the 303 area code — coverage, history, cities, time zone and how to get a number.
On MeraTalkRun your 303 number on a full business phone system — calls, SMS, routing and an AI receptionist included.
On MeraTalkBrowse every US area code by state and find the right local number for the markets you serve.
External referenceSee the FCC's area code relief regulation (47 CFR §52.19) governing how area code 303 and every US area code is administered.
Same product, same support, same compliance on every plan. The AI receptionist is included from day one.
