How many area codes does Colorado have?

Colorado has 5 active geographic area codes in the North American Numbering Plan: 303, 719, 720, 970, 983. Each code serves a distinct region or acts as an overlay for a high-demand metro area.

What is the oldest area code in Colorado?

The oldest area code in Colorado is 303, assigned in 1947. It serves Denver and the Denver-Boulder Metro region. 303 is one of the original 86 area codes created when the North American Numbering Plan was first established.

Can I get a Colorado phone number from anywhere?

Yes. DialPhone virtual phone numbers are not tied to a physical location. You can get a Colorado area code number and use it from any device — desktop, mobile, or browser — anywhere with an internet connection. This makes Colorado numbers ideal for remote teams, distributed businesses, and sales teams targeting Colorado customers.

How much does a Colorado area code number cost?

DialPhone plans start at $24 per user per month on the Core plan. Every plan includes your choice of Colorado area code number, unlimited US and Canada calling, business SMS, AI call captions, and a free 14-day trial — no credit card required. See the DialPhone pricing page for current tier details.

Can I port my existing Colorado number to DialPhone?

Yes. DialPhone supports free number porting from any major US or Canadian carrier, including existing Colorado area code numbers. Porting typically completes in 2 to 5 business days with zero service interruption. See the complete number porting guide for step-by-step instructions.

What time zones are used in Colorado?

Colorado area codes span the MT time zone. When scheduling calls with Colorado customers, verify the specific area code's time zone to avoid calling outside business hours.

Area Codes in Colorado — Local Business Phone Numbers

Quick answer

Colorado has 5 active geographic area codes covering Denver, Colorado Springs, Fort Collins. The most-recognized codes are 303, 719, 970, serving Denver and the Denver-Boulder Metro region.

Total codes: 5
Top metro: Denver
Time zone: MT
Largest code: 303 (Denver)

By Darshan M

Growth Operations Lead at DialPhone · Verified against NANPA data

Area codes in Colorado

Colorado is served by 5 active geographic area codes in the North American Numbering Plan. These codes were assigned between 1947 and 2022 as population and call demand grew across the state.

Code	Primary City	Region	Established	Overlay Codes	Population
303	Denver	Denver-Boulder Metro	1947	720, 983	3,500,000
719	Colorado Springs	Southern Colorado	1988	—	800,000
720	Denver	Denver-Boulder Metro	1998	303, 983	3,500,000
970	Fort Collins	Northern and Western Colorado	1995	—	800,000
983	Denver	Denver-Boulder Metro	2022	303, 720	3,500,000

Time zones in Colorado

All area codes in Colorado fall in the MT time zone.

MT — area codes: 303, 719, 720, 970, 983

Top metros and their area codes

Below are the primary cities in Colorado and the area codes that serve each metro. Cities with multiple codes share geography due to overlay assignments added as demand grew.

Colorado Springs — 719
Denver — 303 , 720 , 983
Fort Collins — 970

Why get a local Colorado number?

A Colorado area code number gives your business three core advantages:

Local trust signal. Customers in Colorado recognize local area codes as their own. A familiar caller ID builds immediate credibility for service businesses, sales teams, and patient communication.
Higher answer rate. Calls from a local area code are answered far more often than toll-free or out-of-area numbers — industry data puts the lift at 20–40%. That difference matters most for outbound sales, appointment confirmations, and service callbacks.
Targeted marketing. Advertising a local Colorado number on print, radio, digital, and outdoor channels converts better than a national 800 number for audiences who prefer doing business locally.

How to get a Colorado area code number with DialPhone

Setting up a Colorado business number takes under 10 minutes:

Sign up for a DialPhone plan. Choose any plan starting at $24/user/month. Free 14-day trial, no credit card required.
Search available Colorado numbers. Filter the DialPhone number inventory by state, area code, city, or number pattern.
Choose your number and configure. Assign your new Colorado number to a user or team, configure call routing, voicemail, AI receptionist, and business SMS.
Port your existing number (optional). Already have a Colorado number? Free number porting completes in 2 to 5 business days with zero service interruption.