You can look up any Colorado phone number and get the owner's name, address, and recent scam reports about it.
Includes 601,700 FTC Do Not Call and robocall complaints filed by Colorado residents.
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Got a missed call or a weird text from an unknown CO number? Whether the call is tied to a mobile line or a landline registered around Denver or Colorado Springs, it’s hard to know who is actually calling. To find out, just type the 10-digit number into our search bar above. Our tool checks public records and user complaints to show you what matters. If the data is available, your search results will include:
Here are the top phone numbers recently reported to the FTC for making unwanted sales calls and robocalls (reported by local residents in the last 30 days):
| Phone Number | Complaints to FTC | Last Reported |
|---|---|---|
| (309) 301-1878 | ||
| (217) 834-9346 | ||
| (321) 499-1628 | ||
| (855) 787-6725 | ||
| (855) 357-2205 | ||
| (855) 994-2073 | ||
| (321) 499-1896 | ||
| (321) 499-1777 | ||
| (256) 274-0005 | ||
| (217) 394-8789 |
In April 2026, consumers from Colorado filed 5,772 complaints about unwanted phone calls and text messages, down 9% from the previous month. In 2024, Colorado residents filed 41,173 unwanted call complaints with the FTC, of which 21,841 were robocalls and 15,876 involved live callers. The most reported complaint topics were imposters (4,409), reducing debt (4,149), medical and prescriptions (2,244).
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.
| Voice Subscriptions (thousands) | 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
This indicates that searching a 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.
| Area Code | Major Cities Covered | Local Scams |
|---|---|---|
| 303 | Denver, Aurora, Lakewood, Thornton, Arvada, Westminster, Centennial | Check 303 Scams |
| 719 | Colorado Springs, Pueblo, Security-Widefield | 719 Scam Alerts |
| 720 | Denver, Aurora, Lakewood, Thornton, Arvada, Westminster, Centennial | View 720 Scams |
| 748 | Fort Collins | Check 748 Scams |
| 970 | Fort Collins, Greeley, Loveland | 970 Scam Alerts |
| 983 | Denver, Aurora, Lakewood, Thornton, Arvada, Westminster, Centennial | View 983 Scams |
To reduce spam calls, register all your phone numbers at National Do Not Call Registry (donotcall.gov or call 1-888-382-1222 from the number you want to protect).
Reporting spam is the best way to stop these calls. Reach out to these offices today:
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.
Yes. Colorado has no law prohibiting residents from using reverse phone lookup services for personal use, but it does have one of the more robust state privacy frameworks in the country. The Fair Credit Reporting Act (FCRA) prohibits using lookup results for employment, tenant, credit, or insurance decisions in every state. Colorado's state law adds rights on top of these federal minimums.
The Colorado Privacy Act (CPA, Colo. Rev. Stat. § 6-1-1301 et seq.) took effect July 1, 2023 and was further amended in 2025. Colorado was the third state after California and Virginia to enact a comprehensive privacy law. The CPA requires covered businesses to honor opt-out requests within 45 days and gives residents the right to access, correct, delete, and receive a portable copy of their personal data. Colorado also requires businesses to support a universal opt-out mechanism - meaning residents can use a browser-level privacy signal to opt out across multiple services at once, without visiting each site individually.
Colorado supplements the CPA with a separate Biometric Information Privacy statute (HB 21-1189), giving residents additional control over fingerprint, facial recognition, and other biometric data. This does not directly affect phone lookup services but reflects the state's broader privacy-first approach. There is no blanket nonprofit exemption under the CPA, though general nonprofit status does provide a partial exemption.
Under the Colorado Privacy Act (CPA), you have the right to delete your personal information and opt out of its sale. Visit each reverse lookup site and submit a deletion request through their opt-out page.
Getting a business name from a phone lookup is helpful, but verification is key. With over 181,963 business establishments in Colorado according to Census data, confirming the company through the Colorado Business Database is the safest approach.
Colorado has about 6.6 million mobile subscriptions compared to 1.2 million VoIP lines and 360,000 landlines. Mobile and VoIP together make up over 95% of all phone numbers.