Reverse Phone Lookup: Colorado

How to Look Up a Colorado Phone Number

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. Our database includes 601,700 FTC complaints filed by Colorado residents. Search results may include:

• Owner name and address (who the number belongs to)
• Location based on area code (the city or area where the line was registered)
• Spam and scam reports by users (if other people have flagged it as a nuisance call)

Phone Numbers Recently Reported for Spam Calls

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	11	May 11, 2026
(217) 834-9346	10	May 21, 2026
(321) 499-1628	10	May 21, 2026
(855) 787-6725	10	May 20, 2026
(855) 357-2205	10	May 19, 2026
(855) 994-2073	10	May 18, 2026
(321) 499-1896	9	May 21, 2026
(321) 499-1777	8	May 21, 2026
(256) 274-0005	8	May 6, 2026
(217) 394-8789	7	May 21, 2026

Monthly FTC Do Not Call & Robocall Complaints Volume

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).

Red Flags: Active Phone Scams in Colorado

Active phone scams currently reported in Colorado:

• Xcel Energy Disconnection Threat: High-pressure robocalls threatening Xcel Energy customers with a 30-45 minute power shutoff for a past-due bill, demanding immediate payment via 'press 1' menus.
• Arapahoe/Boulder Sheriff Jury Duty Warrant: Impersonators like 'Deputy Osborne' claiming victims missed jury duty and must pay a $1,000 bond via a cash card to avoid immediate arrest.
• Fake FedEx Delivery Verification: Callers named 'Albert' or 'Zalma' asking residents to confirm addresses and read back tracking numbers, directing them to call an 833 fake support line to steal information.
• Colorado Solar Rebate Robocall: Automated calls falsely claiming a new state mandate allows homeowners to get $4,000 rebates to switch to solar power at no cost.
• 'Tucker Group' Gatekeeper Scam: Rude, aggressive callers targeting businesses, demanding to speak with the owner by name and falsely claiming association with local entities like the Cherry Creek School District.

Phone Number Search by Area Code

Colorado area codes, coverage regions, and recent spam activity:

Area Code	Major Cities Covered	Lookup / Scams
303	Denver, Aurora, Lakewood, Thornton, Arvada, Westminster, Centennial	303 Phone Lookup
719	Colorado Springs, Pueblo, Security-Widefield	719 Phone Lookup
720	Denver, Aurora, Lakewood, Thornton, Arvada, Westminster, Centennial	720 Phone Lookup
748	Fort Collins	748 Phone Lookup
970	Fort Collins, Greeley, Loveland	970 Phone Lookup
983	Denver, Aurora, Lakewood, Thornton, Arvada, Westminster, Centennial	983 Phone Lookup

Report Fraud and Stop Spam Calls

File a report with the following official agencies to flag unwanted calls or texts:

• Federal Trade Commission (FTC): Submit fraud complaints online at reportfraud.ftc.gov.
• National Do Not Call Registry: Register your number or report individual telemarketing violations at donotcall.gov or by calling 1-888-382-1222.
• Colorado Attorney General "Stop Fraud" Hotline: File a regional report directly with state authorities by calling (800) 222-4444.

Colorado Phone Numbers

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.

Colorado's Do Not Call Registry

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.

Is Reverse Phone Lookup Legal in Colorado?

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.

Your Privacy Rights as a Colorado Resident

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.

FAQs

How to opt out of phone number lookup services in Colorado?

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.

How to confirm a Colorado business caller is real?

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.

What types of phone numbers are in Colorado?

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.