Identify who called from an unknown Colorado phone number. Results may include:
Our database contains over 25 million Do Not Call and robocall complaints reported to the FTC.
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Colorado filed over 41,000 Do Not Call complaints with the FTC. Callers spoofing 303 and 720 Denver numbers frequently pose as sheriff's deputies claiming there is a warrant out for missing jury duty, while numbers from 970 Fort Collins are increasingly used for Xcel Energy shutoff threats. Before paying a sudden fine or utility bill, take a breath and run that number through the reverse phone lookup tool above. It might be all you need to confirm it's a scam.
303 and 720 overlap throughout Denver, 719 serves Colorado Springs and the south, while 970 covers mountains and northern regions. The table below breaks down which codes serve which cities. When an unfamiliar Colorado number calls, don 't guess based on the area code. Use our phone lookup tool to learn who owns it.
| Area Code | Cities |
|---|---|
| 303 | Denver, Aurora, Lakewood, Thornton, Arvada, Westminster, Centennial |
| 719 | Colorado Springs, Pueblo, Security-Widefield |
| 720 | Denver, Aurora, Lakewood, Thornton, Arvada, Westminster, Centennial |
| 748 | |
| 970 | Fort Collins, Greeley, Loveland |
| 983 | Denver, Aurora, Lakewood, Thornton, Arvada, Westminster, Centennial |
Important: Area codes are no longer reliable indicators of a caller's location. Number portability allows users to keep their numbers when they move, and scammers frequently use "neighbor spoofing" to make long-distance or fraudulent calls appear local.
The Denver metro is covered by three overlay codes: 303, 720, and the newer 983, serving Denver, Aurora, Lakewood, Thornton, Arvada, Westminster, Centennial, Boulder, and Highlands Ranch along the Front Range.
Numbers with 970 and the overlay 748 cover northern Colorado and the Western Slope, including Fort Collins, Greeley, Loveland, Grand Junction, and Clifton.
Numbers starting with 719 come from southern Colorado, including Colorado Springs, Pueblo, Security-Widefield, Pueblo West, and Fountain.
Scammers are targeting Colorado homeowners with terrifying jury duty warrants and utility shutoff hoaxes to extract immediate payments. Protect your peace of mind by confirming if this is a known fraud ring before you panic.
Phone numbers reported as unwanted calls to the FTC by local residents in the last 30 days.
(256) 274-0005
18 reports ·
(309) 301-1878
11 reports ·
(855) 994-2073
10 reports ·
(855) 357-2205
9 reports ·
(321) 499-1896
8 reports ·
(321) 499-1628
8 reports ·
(855) 787-6725
8 reports ·
(877) 578-3768
8 reports ·
(279) 499-8870
7 reports ·
(321) 499-1777
7 reports ·
Residents often report IRS arrest warrants, Utility shutoff threats, and fake legal action. In 2024, Colorado residents reported 44,945 fraud cases resulting in total losses of $210,727,907, with a median loss of $500 per victim. Reporting fraud is the best way to stop these calls. Reach out to these offices today:
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). One of the most effective ways to lower the volume of these calls is through the National Do Not Call Registry. Visit donotcall.gov or call 1-888-382-1222 to protect your number.
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, reverse phone lookup is legal in Colorado for personal use like caller identification and fraud prevention. Just remember that federal FCRA laws prohibit using lookup data for employment decisions, tenant approvals, or credit assessments.
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.