Find out who called from an unknown Boulder number using our free reverse phone lookup. Enter any 10-digit number with area code 303, 720, or 983 to search for caller name, address, and more.
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Got a phone call or message from a Boulder, Colorado phone number you don't recognize? Before you answer, call back, or reply, use our phone number lookup service to find out who's really on the other end, is it a scam, legitimate business or someone you'd rather avoid.
The total population of Boulder, CO, is 108,250. That's thousands of potential callers you might not recognize: local business contacts, neighbors, service providers, or people from across the city.
An unknown caller could be anyone — a sales call, an old friend, someone you actually want to talk to. Without caller identification, you either ignore potentially important calls or answer ones you'd rather avoid.
Scam and spam calls continue to impact CO residents which, according to the National Do Not Call Registry Data Book, filed 41,173 complaints about unwanted calls in 2024. Of these, 21,841 were robocalls and 15,876 involved live callers. The top complaint topics included imposters (4,409), reducing debt (4,149), medical and prescriptions (2,244).
According to FTC 2024 data, CO residents reported 44,945 fraud cases in 2024, resulting in $210,727,907 in losses, with a median loss of $500 per victim. Given that more than 1 in 3 fraud attempts occur over the phone, verifying who is calling is critical for preventing financial losses.
If you receive fraudulent calls or suspect a scam attempt, report it to reportfraud.ftc.gov or local police department using the following contacts:
Additionally, protect your household by registering your phone numbers at donotcall.gov or by calling 1-888-382-1222 from the number you wish to register.
Have you received a call from a business but aren’t sure if it’s really them? Boulder is primarily located in Boulder County, which, according to U.S. Census Bureau data, includes 11,943 firms and 12,985 establishments employing 157,001 people.
| County | Percent of City | Firms | Establishments |
|---|---|---|---|
| Boulder | 100.00% | 11943 | 12985 |
Use our service to reverse-lookup unknown Colorado phone numbers to verify whether they actually belong to a company before answering or calling back. By cross-referencing phone numbers with local business directories, you can ensure you’re dealing with legitimate local businesses, services, contractors, or vendors—not scammers spoofing local numbers to gain your trust.
Boulder area codes are 303, 720.
Phone numbers reported as unwanted calls to the FTC by Boulder residents in the last 30 days.
(304) 772-9493
Dropped call or no message
2 reports ·
(304) 307-1432
No Subject Provided
1 report ·
(205) 245-6344
No Subject Provided
1 report ·
(334) 933-2260
Other
1 report ·
(470) 697-6518
Other
1 report ·
(502) 273-8650
Other
1 report ·
(346) 645-6996
Reducing your debt (credit cards, mortgage, student loans)
1 report ·
(303) 616-9946
Calls pretending to be government, businesses, or family and friends
1 report ·
(217) 834-9347
Reducing your debt (credit cards, mortgage, student loans)
1 report ·
(772) 807-3926
Reducing your debt (credit cards, mortgage, student loans)
1 report ·
If you receive fraudulent calls or suspect a scam attempt, report it to reportfraud.ftc.gov or local police department using the following contacts:
Local Time
03:18 AM
Date
Tuesday, April 14, 2026
Time Zone
MDT
Boulder has a population of 108250 people. Sex ratio is 106.50 males per 100 females.
The median age in Boulder is 34.8 years.
| Age Groups | Population |
|---|---|
| Under 5 years | 3273 |
| 5 to 9 years | 3678 |
| 10 to 14 years | 3896 |
| 15 to 19 years | 12249 |
| 20 to 24 years | 22240 |
| 25 to 29 years | 11446 |
| 30 to 34 years | 7148 |
| 35 to 39 years | 5634 |
| 40 to 44 years | 5508 |
| 45 to 49 years | 5517 |
| 50 to 54 years | 5423 |
| 55 to 59 years | 5119 |
| 60 to 64 years | 5060 |
| 65 to 69 years | 3984 |
| 70 to 74 years | 3385 |
| 75 to 79 years | 2117 |
| 80 to 84 years | 1183 |
| 85 years and over | 1917 |
| Racial/Ethnic Groups | Percent |
|---|---|
| White | 85303 |
| Black or African American | 1378 |
| American Indian and Alaska Native | 675 |
| Native Hawaiian and Other Pacific Islander | 130 |
| Some Other Race | 5055 |
| Two or more races | 8741 |