Guide to Colorado Dialing Codes
Everything You Need to Know About CO Phone Numbers
If you’re looking to establish a presence in Colorado, understanding the area code structure in CO is essential. This blog explains how to get a VoIP number with a CO area code and why it matters.
Visual Area Code Map for Colorado
Colorado has four main area codes covering different parts of the state. These are 303, 720, 719, and 970.
List of Colorado Area Codes
- 303 Area Code – Used primarily in Denver
- 720 Area Code – Also covers the Denver area
- 719 Area Code – Covers Colorado Springs and surrounding areas
- 970 Area Code – Northwestern and western CO
Area Code Assignment by Colorado City
- Denver – 303, 720
- Colorado Springs – 719
- Fort Collins – 970
- Pueblo – 719
CO Area Code Expansion Explained
The demand for new numbers due to business expansion led to the creation of overlay codes like 720. Read more on Wikipedia.
Where is 303 Located?
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.
Get a CO Local Number Online
Businesses can get a Colorado virtual number to build trust with local clients. Services like Bling’s virtual phone number platform make setup easy.
Colorado VoIP Providers
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.
Look Up a CO Phone Number
Use tools like 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 build more trust 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
Cloud Numbers with CO Codes
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 website to own a local Colorado 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.
Most trusted area code for Colorado businesses?
303 and 720 are ideal if you're targeting Denver; 970 works best for northern cities; 719 is great for Colorado Springs.
Conclusion: Choosing the Right Colorado Area Code
Getting a Colorado area code is a smart move for anyone serving Colorado customers. Whether you need a virtual phone number, VoIP service, or a business phone system, the right area code sets the tone.