Complete Guide to Colorado Area Codes

If you’re looking to expand your business into Colorado, understanding the Colorado area code system 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.

What Are the Main Area Codes in Colorado?

• 303 Area Code – Covers Denver and Boulder
• 720 Area Code – Also covers the Denver area
• 719 Area Code – Covers Colorado Springs and surrounding areas
• 970 Area Code – Covers Fort Collins, Greeley, Grand Junction

Area Code Assignment by Colorado City

• Aurora – 303, 720
• Boulder – 303, 720
• Greeley – 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.

What is the 303 Area Code?

303 is assigned in 1947 for Denver and Boulder. It's now shared with its overlay 720.

How Overlay Area Codes Work in Colorado

An overlay area code, like 720 over 303, allows multiple users in the same location to have unique numbers. Learn more on FCC.gov.

Get a CO Local Number Online

Businesses can get a local CO 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.

Business Phone Systems for CO Area Codes

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.

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.

Use Cases for Colorado Numbers

• 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 most of Central Colorado 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, Colorado phone area codes 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.

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 looking to expand into the state. Whether you need a virtual phone number, VoIP service, or a business phone system, the right area code sets the tone.