Reverse Phone Number Lookup by Area Code
Top cities covered by each Colorado area code to help you start your reverse phone lookup:
| Area Code | Cities Covered | Phone Number Lookup |
|---|---|---|
| 303 | Denver, Aurora, Lakewood, Thornton, Arvada, Westminster, Centennial | 303 Phone Number Lookup |
| 719 | Colorado Springs, Pueblo, Security-Widefield | 719 Phone Number Lookup |
| 720 | Denver, Aurora, Lakewood, Thornton, Arvada, Westminster, Centennial | 720 Phone Number Lookup |
| 748 | Fort Collins | - |
| 970 | Fort Collins, Greeley, Loveland | 970 Phone Number Lookup |
| 983 | Denver, Aurora, Lakewood, Thornton, Arvada, Westminster, Centennial | 983 Phone Number Lookup |
For latest Colorado phone numbering regulations, contact Gladys Rey at the Colorado PUC via [email protected] or 303-894-2843.
Spam Phone Number Lookup: Recently Reported Numbers
Phone numbers recently reported from Colorado to the FTC for making unwanted sales calls or robocalls:
| Phone Number | Complaints to FTC | Last Reported |
|---|---|---|
| (855) 787-6725 | ||
| (719) 454-7221 | ||
| (206) 209-2397 | ||
| (877) 578-1814 | ||
| (866) 666-1439 | ||
| (224) 255-8542 | ||
| (217) 834-9977 | ||
| (321) 395-8866 | ||
| (719) 350-6204 | ||
| (437) 837-3704 |
FTC Do Not Call & Robocall Complaints
In May 2026, consumers from Colorado filed 5,506 complaints about unwanted phone calls and text messages, down 5% 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).
Reported Phone Scams
- 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.
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 |
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.