Understanding Colorado Dialing Codes for Business & Personal Use
If you’re looking to target customers in Colorado, understanding the area code structure in CO is essential. This blog explains how to get a Colorado virtual number and why it matters.
Visual Area Code Map for Colorado
Colorado has four main area codes covering different parts of the state. These are the codes 303, 720, 719, and 970.
List of Colorado Area Codes
- 303 Area Code – Used primarily in Denver
- 720 Area Code – Overlay of 303
- 719 Area Code – Serves Pueblo and southeastern Colorado
- 970 Area Code – Serves cities in Northern Colorado
Cities Using Colorado Area Codes
- Denver – 303, 720
- Boulder – 303, 720
- Fort Collins – 970
- Grand Junction – 970
Reason Behind Colorado’s Area Code Growth
The demand for new numbers due to technology adoption led to the creation of overlay codes like 720. Read more on Wikipedia.
Facts About the 303 Code
303 is one of the oldest area codes in the U.S.. It's now still in use with 720.
How Overlay Area Codes Work in Colorado
An overlay area code, like 720 over 303, allows the expansion of service without disrupting existing lines. Learn more on FCC.gov.
Buy a Colorado Area Code for Business
Businesses can get a local CO number to build trust with local clients. Services like Bling’s virtual phone number platform make setup easy.
Internet Calling with CO Area Codes
Modern businesses use VoIP phone services to assign local Colorado numbers to sales or support teams. It’s cost-effective and flexible.
Professional Phone Setup in Colorado
To fully manage calls and teams, choose a business phone system that supports routing, voicemail, SMS, and extensions – ideal for companies targeting Colorado.
Colorado Area Code Lookup Tools
Use tools like list of Colorado area codes AreaCodeLocations.info, AllAreaCodes, or NANPA to identify or verify area codes.
Should You Use a Local or Toll-Free Number in CO?
Local CO numbers like 303 or 970 tend to feel more familiar than toll-free numbers. Use a Colorado business phone number to increase conversions.
Who Uses CO Area Codes?
- Sales and outbound calls
- Customer service or support lines
- SMS-based marketing campaigns
- Remote work call routing
Set Up a VoIP Line in Colorado
Choose cloud-based phone systems from Bling.cloud,RingCentral, Nextiva, or Twilio if you want scalable solutions for Colorado-based numbers.
Frequently Asked Questions
What cities use the 720 area code?
Cities like Denver, Boulder, Aurora, and Lakewood use the 720 overlay.
Is 719 a mobile or landline code?
It can be both. Use copyright lookup tools to verify.
Can I get a CO number if I live outside the state?
Yes, VoIP services allow you to own a CO number from anywhere in the world.
Is 970 still active?
Yes, 970 is actively used in Northern and Western Colorado cities like Fort Collins and Grand Junction.
Which CO code is best for business?
303 and 720 are ideal if you're targeting Denver; 970 works best for northern cities; 719 is great for Colorado Springs.
Start with the Right Colorado Number
Getting a Colorado area code is a smart move for anyone wanting local presence in CO. Whether you need a virtual phone number, VoIP service, or a business phone system, the right area code sets the tone.