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303 Area Code 🌍☎️

Area Code Profile · Colorado

The 303 area code is located in the state of Colorado and covers 137 cities, serving a total population of approximately 2,654,413. Major cities covered by the 303 area code include Denver, Aurora, Lakewood, Thornton, Arvada (which represents the most populated areas). There are a total of 783 telephone prefix exchanges in this area code, which support an estimated 7,830,000 active or assignable phone numbers. These prefix lines are operated by 28 distinct carriers, with Denver as the primary rate center location.

Mountain Time137 Cities783 Prefixes

Reverse Phone Lookup in Denver, Colorado

Unmask unknown callers, verify telemarketing reports, and view detailed owner information for any phone number beginning with area code (303).

How it works

1

Enter Number

Provide any 10-digit phone number starting with the (303) area code.

2

Database Search

Our system scans public registries, carrier mappings, and spam reports.

3

Reveal Report

Access location details, line type, carrier, owner information, and safety levels.

Neighborhood Demographics

Calculated demographics and census summary estimations for area code 303.

45.2 y/oMedian Age
$64,200Median Income
$607,000Median Home Value
2,654,413Total Population

Telemarketer Complaints

Most recent complaints and comments for phone numbers beginning with 303.

Did you receive an unwanted call from a (303) phone number?

Help the community identify spammers by filing a comment.

(303) 650-6555May 20, 2026Debt Collector
Automated voice caller looking for someone named David. Keeps calling repeatedly asking to settle a debt. I have had this number for years and don't know David.
See Details
(303) 663-6572May 19, 2026Political
Pre-recorded campaign call promoting a local candidate. Did not respect my request to be placed on the Do Not Call list.
See Details
(303) 676-6589May 18, 2026Scam / Fraud
Received a text and follow-up call saying my bank account was locked due to suspicious transactions. Included a link to a fake login portal. Do not click!
See Details

Cities in the 303 Area Code

The most populous cities in area code 303 are: Denver (600,158), Aurora (325,078), Lakewood (142,980), Thornton (118,772), and Arvada (106,433).

Other cities in the 303 area code include:

Westminster, Centennial, Boulder, Highlands Ranch, Longmont, Broomfield, Castle Rock, Commerce City, Parker, Littleton, Northglenn, Brighton, Ken Caryl, Dakota Ridge, Englewood, Wheat Ridge, Lafayette, Columbine, Golden, Louisville, Sherrelwood, Erie, Welby, Greenwood Village, Superior.

CityPopulation% in Area Code
Denver600,158100%
Aurora325,078100%
Lakewood142,980100%
Thornton118,772100%
Arvada106,433100%
Westminster106,114100%
Centennial100,377100%
Boulder97,385100%
Highlands Ranch96,713100%
Longmont86,270100%
Broomfield55,889100%
Castle Rock48,231100%
Commerce City45,913100%
Parker45,297100%
Littleton41,737100%
Northglenn35,789100%
Brighton33,352100%
Ken Caryl32,438100%
Dakota Ridge32,005100%
Englewood30,255100%

Showing top 20 of 137 cities.

What Time Zone is Area Code 303?

Mountain Time Zone

Abbreviation: MT · UTC Offset: UTC-7

The 303 area code lies within the Mountain Time Zone (MT, UTC-7).

Nearby Area Codes

719Colorado Springs, Colorado720Denver, Colorado970Fort Collins, Colorado983Denver, Colorado

Phone Prefixes in the 303 Area Code

783 prefixes found · 28 carriers · 13 rate centers

PrefixCarrierRate Center
(303) 200TELEPORT COMMUNICATIONS AMERICA, LLC - CODENVER
(303) 201USA MOBILITY WIRELESS, INC.DENVER
(303) 202QWEST CORPORATIONDENVER
(303) 203AMERICAN MESSAGING SERVICES, LLCDENVER
(303) 204CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CODENVER
(303) 205QWEST CORPORATIONDENVER
(303) 206USA MOBILITY WIRELESS, INC.DENVER
(303) 207USA MOBILITY WIRELESS, INC.DENVER
(303) 208USA MOBILITY WIRELESS, INC.DENVER
(303) 209MCIMETRO ACCESS TRANSMISSION SERVICES LLCDENVER
(303) 210T-MOBILE USA, INC.DENVER
(303) 212AMERICAN MESSAGING SERVICES, LLCDENVER
(303) 213USA MOBILITY WIRELESS, INC.DENVER
(303) 214MCIMETRO ACCESS TRANSMISSION SERVICES LLCDENVER
(303) 215QWEST CORPORATIONDENVER
(303) 216QWEST CORPORATIONDENVER
(303) 217MCIMETRO ACCESS TRANSMISSION SERVICES LLCDENVER
(303) 218MCIMETRO ACCESS TRANSMISSION SERVICES LLCDENVER
(303) 219MCIMETRO ACCESS TRANSMISSION SERVICES LLCDENVER
(303) 220QWEST CORPORATIONDENVER
(303) 221QWEST CORPORATIONDENVER
(303) 222MCIMETRO ACCESS TRANSMISSION SERVICES LLCDENVER
(303) 223GLOBAL CROSSING LOCAL SERVICES, INC. - CODENVER
(303) 224QWEST CORPORATIONDENVER
(303) 225GLOBAL CROSSING LOCAL SERVICES, INC. - CODENVER
(303) 226LEVEL 3 COMMUNICATIONS, LLC - CODENVER
(303) 227QWEST CORPORATIONDENVER
(303) 228LEVEL 3 COMMUNICATIONS, LLC - CODENVER
(303) 229CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CODENVER
(303) 230USA MOBILITY WIRELESS, INC.DENVER
(303) 231QWEST CORPORATIONDENVER
(303) 232QWEST CORPORATIONDENVER
(303) 233QWEST CORPORATIONDENVER
(303) 234QWEST CORPORATIONDENVER
(303) 235QWEST CORPORATIONDENVER
(303) 236QWEST CORPORATIONDENVER
(303) 237QWEST CORPORATIONDENVER
(303) 238QWEST CORPORATIONDENVER
(303) 239QWEST CORPORATIONDENVER
(303) 240USA MOBILITY WIRELESS, INC.DENVER
(303) 241CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CODENVER
(303) 242MCIMETRO ACCESS TRANSMISSION SERVICES LLCDENVER
(303) 243N.E. COLORADO CELLULAR, INC.DENVER
(303) 244QWEST CORPORATIONDENVER
(303) 245QWEST CORPORATIONDENVER
(303) 246T-MOBILE USA, INC.DENVER
(303) 247QWEST CORPORATIONDENVER
(303) 248TELEPORT COMMUNICATIONS AMERICA, LLC - CODENVER
(303) 249NEW CINGULAR WIRELESS PCS, LLCDENVER
(303) 250NEW CINGULAR WIRELESS PCS, LLCDENVER
(303) 251USA MOBILITY WIRELESS, INC.DENVER
(303) 252QWEST CORPORATIONDENVER
(303) 253TELEPORT COMMUNICATIONS AMERICA, LLC - CODENVER
(303) 254QWEST CORPORATIONDENVER
(303) 255QWEST CORPORATIONDENVER
(303) 256TELEPORT COMMUNICATIONS AMERICA, LLC - CODENVER
(303) 257T-MOBILE USA, INC.DENVER
(303) 258QWEST CORPORATIONDENVER
(303) 259AMERICAN MESSAGING SERVICES, LLCDENVER
(303) 260QWEST CORPORATIONDENVER
(303) 261QWEST CORPORATIONDENVER
(303) 262TELEPORT COMMUNICATIONS AMERICA, LLC - CODENVER
(303) 263CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CODENVER
(303) 264TELEPORT COMMUNICATIONS AMERICA, LLC - CODENVER
(303) 265QWEST CORPORATIONDENVER
(303) 266USA MOBILITY WIRELESS, INC.DENVER
(303) 267QWEST CORPORATIONDENVER
(303) 268LEVEL 3 COMMUNICATIONS, LLC - CODENVER
(303) 269QWEST CORPORATIONDENVER
(303) 270QWEST CORPORATIONDENVER
(303) 271QWEST CORPORATIONDENVER
(303) 272QWEST CORPORATIONDENVER
(303) 273QWEST CORPORATIONDENVER
(303) 274QWEST CORPORATIONDENVER
(303) 275QWEST CORPORATIONDENVER
(303) 276ONVOY, LLC - CODENVER
(303) 277QWEST CORPORATIONDENVER
(303) 278QWEST CORPORATIONDENVER
(303) 279QWEST CORPORATIONDENVER
(303) 280QWEST CORPORATIONDENVER
(303) 281QWEST CORPORATIONDENVER
(303) 282QWEST CORPORATIONDENVER
(303) 283QWEST CORPORATIONDENVER
(303) 284COMCAST IP PHONE, LLCDENVER
(303) 285LEVEL 3 COMMUNICATIONS, LLC - CODENVER
(303) 286QWEST CORPORATIONDENVER
(303) 287QWEST CORPORATIONDENVER
(303) 288QWEST CORPORATIONDENVER
(303) 289QWEST CORPORATIONDENVER
(303) 290QWEST CORPORATIONDENVER
(303) 291QWEST CORPORATIONDENVER
(303) 292QWEST CORPORATIONDENVER
(303) 293QWEST CORPORATIONDENVER
(303) 294QWEST CORPORATIONDENVER
(303) 295QWEST CORPORATIONDENVER
(303) 296QWEST CORPORATIONDENVER
(303) 297QWEST CORPORATIONDENVER
(303) 298QWEST CORPORATIONDENVER
(303) 299QWEST CORPORATIONDENVER
(303) 300QWEST CORPORATIONDENVER

Showing first 100 of 783 prefixes.

Frequently Asked Questions

Where is area code 303?
Area code 303 is located in Colorado, covering cities including Denver, Aurora, Lakewood.
What time zone is area code 303?
Area code 303 is in the Mountain Time Zone (MT, UTC-7).
What state is area code 303?
Area code 303 is in Colorado.