Complete Guide to Colorado Area Codes

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 a few major dialing codes covering different parts of the state. These are area codes 303, 720, 719, and 970 respectively.

Breakdown of CO Phone Codes

• 303 Area Code – Serves the Denver Metro region
• 720 Area Code – Overlay of 303
• 719 Area Code – Covers Colorado Springs and surrounding areas
• 970 Area Code – Covers Fort Collins, Greeley, Grand Junction

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 business expansion led to the introduction of new codes like 970. Read more on Wikipedia.

Facts About the 303 Code

303 is the original area code for Colorado. It's now overlaid by 720.

Colorado Area Code Overlays

An overlay area code, like 720 over 303, allows new phone numbers without changing geographic coverage. 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.

VoIP Solutions for Colorado Numbers

Modern businesses use VoIP phone services to assign local Colorado numbers to sales or support teams. It’s cost-effective and flexible.

Set Up a Colorado Business Line

To fully manage calls and teams, choose a business phone system that supports routing, voicemail, SMS, and extensions – ideal for companies targeting Colorado.

How to Find an Area Code in Colorado

Use tools like AreaCodeLocations.info, AllAreaCodes, or NANPA to identify or verify area codes.

Why Local Numbers Work Best in Colorado

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.

Use Cases for Colorado Numbers

• Sales and outbound calls
• Customer service or support lines
• SMS-based marketing campaigns
• Remote work call routing

Colorado Phone Numbers for VoIP

Choose cloud-based phone systems from Bling.cloud,RingCentral, Nextiva, or Twilio if you want scalable solutions for Colorado-based numbers.

CO Area Code FAQ Section

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 Colorado number from anywhere in the world.

Do people still use 970?

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 get a local Colorado number a virtual phone number, VoIP service, or a business phone system, the right area code sets the tone.