US Phone Lookup /
Colorado Reverse Phone Lookup
Identify unknown Colorado phone numbers.
Use ThisNumber's reverse phone lookup tool to find out who's calling you.
Federal Data
State Data
County Data
City Data
US Phone Lookup /
Identify unknown Colorado phone numbers.
Use ThisNumber's reverse phone lookup tool to find out who's calling you.
Federal Data
State Data
County Data
City Data
ThisNumber has over 28 million name and address records for about 23 million phone numbers, making it one of the best reverse phone lookup services for Colorado residents. Stop wondering who called you and start using this free lookup tool to identify the unknown callers, verify Colorado businesses, or research potential scam calls.
To identify the location of an Colorado phone number, you need to understand the North American Numbering Plan (NANP) structure that all Alabama numbers follow: +1 NPA NXX XXXX.
The area code (NPA) is your key to determining location. By matching the three-digit area code to Colorado's regional assignments, you can identify which part of the state the phone number originates from. Each area code corresponds to specific cities and counties throughout Colorado, making it possible to narrow down the caller's general location.
Here's a complete list of Colorado area codes with major cities:
| Area Codes | Cities |
|---|---|
| 303/720/983 | Denver, Aurora, Lakewood |
| 719 | Colorado Springs, Pueblo, Security-Widefield |
| 748/970 | Fort Collins, Greeley, Loveland |
For latest Colorado phone numbering regulations, contact Gladys Rey at the Colorado PUC via [email protected] or 303-894-2843.
Colorado has approximately 8.2 million active phone numbers. Cell phones are the most popular with 6.6 million users, while traditional landlines are declining with 360,000 connections statewide. Internet phone services account for about 1.2 million numbers.
This indicates that searching a Colorado phone number will most likely lead to a cell phone. The decrease in landlines suggests that newer phone numbers may be harder to trace compared to older landline numbers with more readily available public information.
Colorado Voice Subscriptions (in thousands):
| Service Type | June 2023 | Dec 2023 | June 2024 |
|---|---|---|---|
| Mobile telephony | 6,391 | 6,500 | 6,635 |
| Local exchange telephone service | 409 | 376 | 360 |
| VoIP subscriptions | 1,206 | 1,164 | 1,216 |
| Total | 8,006 | 8,040 | 8,211 |
Source: FCC Voice Telephone Services Report
Most phone numbers are cell phones, and most cell phone numbers come from the top three United States wireless companies. Here are the top five US Cell Phone Companies in Q1 2025:
Colorado residents experienced a moderate volume of unwanted calls in 2024, with complaints totaling 41,173, ranking the state #10 nationally for complaints per 100K population, according to the latest National Do Not Call Registry Data Book.
Key Facts for Colorado Residents:
Colorado residents can protect themselves from unwanted telemarketing calls by registering with the Colorado No-Call List. The state requires residents to register on both the Colorado No-Call List and the National Do Not Call Registry for maximum protection. You can sign up online at ColoradoNoCall.com or by calling 800-309-7041, with registration available 24/7 at no cost to consumers.
Colorado's system operates on a quarterly update schedule, with telemarketers receiving updated lists on January 10, April 10, July 10, and October 31 each year. Telemarketers have 20 days after each update to remove registered numbers from their calling lists. Complaints can only be filed after the enforcement dates that follow each quarterly update period.
The state law includes standard exemptions for calls with prior permission, calls from businesses with existing relationships, charitable organizations, and political calls or polls. However, Colorado has specific enforcement thresholds - state action requires a pattern of at least three violations per month to any numbers on the list, not necessarily to the same number.
Violations can be reported through the Colorado No-Call List website, with complaint information shared with the Colorado Attorney General's Office for potential enforcement action. Residents may also pursue private remedies through small-claims court under the Colorado Consumer Protection Act, giving consumers both state and individual legal options.
When using reverse phone lookup services to identify unknown callers, understanding Colorado's dual-registration requirement and quarterly enforcement schedule helps you recognize which calls may be violations worth reporting to state authorities.
According to the Federal Trade Commission's 2024 data, phone calls and text messages make up 35% of all fraud contact methods nationwide:
More than 1 in 3 fraud attempts happen through phone communication. Phone call fraud costs victims a median of $1,500 per case. Text message fraud costs a median of $1,000 per victim.
In 2024, Colorado residents reported 73231 fraud cases resulting in total losses of $210.7M, with a median loss of $500 per victim. With phone-based fraud representing such a significant portion of these cases, phone owner verification has become a critical consumer protection tool.
When you receive calls from unknown numbers, take a moment to research the caller's identity. Reverse phone lookup services allow you to search a phone number to find information about who's calling—including whether the number has been reported for fraudulent activity.
Received fraudulent calls or fallen victim to phone fraud? Report it immediately. Each report helps authorities identify fraud patterns and protect other consumers from similar scams.
Additional Contact:
Colorado Attorney General
Phil Weiser
(720) 508-6000
YES - Reverse phone lookups are generally legal in Colorado, but your personal data connected to your phone number is protected under the Colorado Privacy Act (Senate Bill 21-190), which gives you specific rights to control how companies use your information.
The Colorado Privacy Act, which took effect July 1, 2023, doesn't ban reverse phone lookups but provides strong protections for your personal data that might be included in these services.
Under the Colorado Privacy Act, "personal data" includes any information that is linked or reasonably linkable to an identified or identifiable individual. For phone lookup services, this covers your name linked to your phone number, address information, location data, and online identifiers that can be traced back to you.
Colorado residents have five key rights when companies collect their personal data:
Companies must respond to your requests within 45 days. Submit requests through methods specified in the company's privacy notice, and companies cannot require you to create a new account to exercise your rights. Most requests are free. For guidance on exercising your rights, visit the Colorado Attorney General's CPA resource page.
The Colorado Privacy Act has been in effect since July 1, 2023. It applies to companies that conduct business in Colorado or target Colorado residents and process personal data of 100,000+ consumers per year, or sell personal data and process data of 25,000+ consumers.
Yes, under the Colorado Privacy Act, you can request deletion of your personal data from companies covered by the law and opt out of having your data sold to third parties. However, companies may keep your data if needed for legal compliance or fraud prevention.