Area Code 303-800 : Area Code 303-899 is your one-stop site for area code lookup, phone number lookup, and free phone number reviews. Following is reverse lookup detail & reviews for area code 303 8xx including 303 area code location map. Major cities such as Denver, Aurora, Westminster, Englewood, Centennial covered within area code 303 8xx are also listed on this page. More area codes, including those outside of Colorado, United States of America, are on the homepage.

Reverse Lookup Detail for Area Code 303 8xx

Area code 303 covers part of Coloradostate, covering most of Denver, Boulder, Arapahoe, Weld, Douglas counties. It was started on Jan 01, 2000. This region follows US/Mountain + Daylight Savings timezone. Other popular area codes that belong to Colorado state include 719, 720, 970.

Verified changes in Area Code 303 8XX

Date ChangedChange Details
Jun 13, 2014Area code 303-835 was introduced on Jan 17, 2007 and subscribers are operational from Jun 13, 2014.
Jun 13, 2014Area code 303-862 was introduced on May 03, 2007 and subscribers are operational from Jun 13, 2014.
Jun 13, 2014Area code 303-856 was introduced on Feb 08, 2007 and subscribers are operational from Jun 13, 2014.
Jun 13, 2014Area code 303-834 was introduced on Jan 11, 2007 and subscribers are operational from Jun 13, 2014.
Jun 13, 2014Area code 303-827 was introduced on Nov 22, 2002 and subscribers are operational from Jun 13, 2014.
Jun 13, 2014Area code 303-872 was introduced on Jan 11, 2007 and subscribers are operational from Jun 13, 2014.

Area Code 303-800 - Area Code 303-899 (Covers 303 8xx xxxx phone numbers)

Area CodeCityCountyPopulationNetwork Operator
303-800DenverDenver600,158Level 3 Communications LLC - CO
303-801-3AuroraDenver600,158tw telecom of colorado llc - CO
303-801-0DenverDenver600,158MCImetro Access Transmission Services LLC
303-801-7DenverDenver600,158New Cingular Wireless PCS LLC
303-801-8WestminsterDenver600,158Cellco Partnership dba Verizon Wireless - CO
303-802-0AuroraDenver600,158tw telecom of colorado llc - CO
303-802-8DenverDenver600,158McLeodUSA Telecommunication Services Inc - CO
303-802-9DenverDenver600,158New Cingular Wireless PCS LLC
303-802-5EnglewoodDenver600,158XO Colorado LLC
303-803-0AuroraDenver600,158tw telecom of colorado llc - CO
303-803-8DenverDenver600,158New Cingular Wireless PCS LLC
303-804CentennialDenver600,158Qwest Corporation
303-805ParkerDenver600,158Qwest Corporation
303-806EnglewoodDenver600,158Qwest Corporation
303-807DenverDenver600,158New Cingular Wireless PCS LLC
303-808DenverDenver600,158New Cingular Wireless PCS LLC
303-809DenverDenver600,158New Cingular Wireless PCS LLC
303-810DenverDenver600,158New Cingular Wireless PCS LLC
303-811671,813One Call Services-Pipeline And Utility Safety
303-812DenverDenver600,158Qwest Corporation
303-813DenverDenver600,158Qwest Corporation
303-814Castle RockDenver600,158Qwest Corporation
303-815-0DenverDenver600,158Interlink Advertising Services Inc dba Forethought.Net - CO
303-815-6DenverDenver600,158New Cingular Wireless PCS LLC
303-815-9WestminsterDenver600,158Cellco Partnership dba Verizon Wireless - CO
303-816-0BaileyDouglas285,465Qwest Corporation
303-816-8DenverDouglas285, CLEC LLC - CO
303-816-3DenverDouglas285,465Level 3 Communications LLC - CO
303-817WestminsterDenver600,158Cellco Partnership dba Verizon Wireless - CO
303-818WestminsterDenver600,158Cellco Partnership dba Verizon Wireless - CO
303-819WestminsterDenver600,158Cellco Partnership dba Verizon Wireless - CO
303-820DenverDenver600,158Qwest Corporation
303-821DenverDenver600,158USA Mobility Wireless Inc
303-822ByersArapahoe572,003Bijou Telephone Cooperative Association Inc
303-823-4DenverBoulder294,567MCImetro Access Transmission Services LLC
303-823-3EnglewoodBoulder294,567YMax Communications Corporation - CO
303-823-0LyonsBoulder294,567Qwest Corporation
303-824AuroraDenver600,158Teleport Communications America LLC - CO
303-825DenverDenver600,158Qwest Corporation
303-826DenverDenver600,158USA Mobility Wireless Inc
303-827-3DenverBoulder294,567Comcast Phone of Colorado LLC - CO
303-827-0DenverBoulder294,567ICG Telecom Group Inc - CO
303-827-9WestminsterBoulder294,567Cellco Partnership dba Verizon Wireless - CO
303-828-8EnglewoodDenver600,158Cellco Partnership dba Verizon Wireless - CO
303-828-0ErieDenver600,158Qwest Corporation
303-829EnglewoodDenver600,158Cellco Partnership dba Verizon Wireless - CO
303-830DenverDenver600,158Qwest Corporation
303-831DenverDenver600,158Qwest Corporation
303-832DenverDenver600,158Qwest Corporation
303-833FrederickDenver600,158Qwest Corporation
303-834-4AuroraBoulder294,567tw telecom of colorado llc - CO
303-834-7DenverBoulder294, CLEC LLC - CO
303-834-9DenverBoulder294,567Comcast Phone of Colorado LLC - CO
303-834-6DenverBoulder294,567iLoka Inc dba NewCloud Networks - CO
303-834-3DenverBoulder294,567MCImetro Access Transmission Services LLC
303-834-5DenverBoulder294,567New Cingular Wireless PCS LLC
303-834-1EnglewoodBoulder294,567XO Colorado LLC
303-834-0WestminsterBoulder294,567Cellco Partnership dba Verizon Wireless - CO
303-835-5BrightonAdams441,603Qwest Corporation
303-835-2DenverAdams441,603Comcast Phone of Colorado LLC - CO
303-835-0DenverAdams441,603Level 3 Communications LLC - CO
303-835-8EnglewoodAdams441,603YMax Communications Corporation - CO
303-836DenverDenver600,158Communications Unlimited
303-837DenverDenver600,158Qwest Corporation
303-838BaileyDouglas285,465Qwest Corporation
303-839DenverDenver600,158Qwest Corporation
303-840ParkerDenver600,158Qwest Corporation
303-841ParkerDenver600,158Qwest Corporation
303-842-0AuroraDenver600,158Cellco Partnership dba Verizon Wireless - CO
303-842-8DenverDenver600,158T-Mobile USA Inc
303-843CentennialDenver600,158Qwest Corporation
303-844DenverDenver600,158Qwest Corporation
303-845-0AuroraBoulder294,567Teleport Communications America LLC - CO
303-845-2WestminsterBoulder294,567Cellco Partnership dba Verizon Wireless - CO
303-846CentennialDenver600,158Qwest Corporation
303-847-0DenverDenver600,158Level 3 Communications LLC - CO
303-847-9DenverDenver600,158T-Mobile USA Inc
303-848-0DenverBoulder294,567ICG Telecom Group Inc - CO
303-848-8DenverBoulder294,567Level 3 Communications LLC - CO
303-849RoggenWeld252,825Roggen Telephone Cooperative Company
303-850CentennialDenver600,158Qwest Corporation
303-851DenverDenver600,158USA Mobility Wireless Inc
303-852DenverDenver600,158USA Mobility Wireless Inc
303-853Commerce CityDenver600,158Qwest Corporation
303-854-0DenverDenver600,158ICG Telecom Group Inc - CO
303-854-9DenverDenver600,158Level 3 Communications LLC - CO
303-854-8WestminsterDenver600,158Cellco Partnership dba Verizon Wireless - CO
303-855DenverDenver600,158USA Mobility Wireless Inc
303-856-7DenverArapahoe572,003Comcast Phone of Colorado LLC - CO
303-856-8DenverArapahoe572,003T-Mobile USA Inc
303-856-0Greenwood VillageArapahoe572,003ICG Telecom Group Inc - CO
303-857-5DenverWeld252,825Level 3 Communications LLC - CO
303-857-0Fort LuptonWeld252,825Qwest Corporation
303-858EnglewoodDenver600,158Qwest Corporation
303-859-8DenverDenver600,158New Cingular Wireless PCS LLC
303-859-0WestminsterDenver600,158Cellco Partnership dba Verizon Wireless - CO
303-860DenverDenver600,158Qwest Corporation
303-861DenverDenver600,158Qwest Corporation
303-862-0DenverDenver600,158Comcast Phone of Colorado LLC - CO
303-862-3DenverDenver600,158Eschelon Telecom of Colorado Inc - CO
303-862-2DenverDenver600,158New Cingular Wireless PCS LLC
303-863DenverDenver600,158Qwest Corporation
303-864DenverDenver600,158Qwest Corporation
303-865-8DenverDenver600,158Cbeyond Communications LLC - CO
303-866DenverDenver600,158Qwest Corporation
303-867-0DenverDenver600,158iLoka Inc dba NewCloud Networks - CO
303-868WestminsterDenver600,158Cellco Partnership dba Verizon Wireless - CO
303-869DenverDenver600,158Qwest Corporation
303-870EnglewoodDenver600,158Cellco Partnership dba Verizon Wireless - CO
303-871DenverDenver600,158Qwest Corporation
303-872-1DenverArapahoe572,003Cbeyond Communications LLC - CO
303-872-0DenverArapahoe572,003Level 3 Communications LLC - CO
303-873DenverArapahoe572,003Qwest Corporation
303-874Greenwood VillageArapahoe572,003ICG Telecom Group Inc - CO
303-875DenverDenver600,158T-Mobile USA Inc
303-876DenverDenver600,158MCImetro Access Transmission Services LLC
303-877EnglewoodDenver600,158Cellco Partnership dba Verizon Wireless - CO
303-878DenverDenver600,158USA Mobility Wireless Inc
303-879DenverDenver600,158USA Mobility Wireless Inc
303-880EnglewoodDenver600,158Cellco Partnership dba Verizon Wireless - CO
303-881DenverDenver600,158New Cingular Wireless PCS LLC
303-882DenverDenver600,158New Cingular Wireless PCS LLC
303-883DenverDenver600,158New Cingular Wireless PCS LLC
303-884DenverDenver600,158New Cingular Wireless PCS LLC
303-885DenverDenver600,158New Cingular Wireless PCS LLC
303-886DenverDenver600,158New Cingular Wireless PCS LLC
303-887DenverDenver600,158New Cingular Wireless PCS LLC
303-888DenverDenver600,158New Cingular Wireless PCS LLC
303-889-0CentennialDenver600,158Qwest Corporation
303-890DenverDenver600,158USA Mobility Wireless Inc
303-891DenverDenver600,158USA Mobility Wireless Inc
303-892BroomfieldDenver600,158Qwest Corporation
303-893DenverDenver600,158Qwest Corporation
303-894DenverDenver600,158Qwest Corporation
303-895-0AuroraDenver600,158Cellco Partnership dba Verizon Wireless - CO
303-896DenverDenver600,158Qwest Corporation
303-897DenverDenver600,158USA Mobility Wireless Inc
303-898DenverDenver600,158New Cingular Wireless PCS LLC
303-899DenverDenver600,158Qwest Corporation

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303 Area Code

At, you'll find current information on 303area code, including 303 area code location & map. Other phone area code may be searched using's area code locator service on the homepage. Use the phone number search function above to instant verify area code lookup & phone number lookup.

Colorado Area Codes Directory provides a free area codes directory with detailed information on the various USA area codes, area codes listing, and other area codes phone details. also lists international area codes within the North American Numbering Plan. And you can verify owners of phone numbers using the reverse number lookup service by entering a 10 digit phone number in the top most text box.

303 Area Code Finder

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Colorado Area Code Lookup is an excellent resource for area code lookup and reverse number lookup. Here you'll find area codes, city, county, population & operator list table of area codes within the United States. Also, you can verify owners of phone numbers with full name & address information for background check. For a full list of area codes, visit home page. It provides drilldown for USA area codes and area code location maps.

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Telephone/Landline Area Codes is a resource of North American telephone area codes. Beyond area code listings, relevant information about each area code is detailed. For example, this page details area code 303-8. You can also search area codes by state, and within the NANP, find country area codes.

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303 Area Code Reviews provides local reviews for phone numbers and aggregates results per area code. It shows you the area code location covered by each area code; for example, the LA area code reveiws covers local business phone numbers area in Los Angeles. This page details area code 303-8. All USA states area codes may be found using

Telephone Area Codes in Colorado

The telephone area code prefixes local phone numbers & is not required to be dialed. For area codes by city, search Area codes telephone differ from region to region, and in some places the area code must be dialed even when calling locally within that region. Find out more with area code decoder.

External links & resources for area code 303 in Colorado

  • CitySites Pages for Colorado (Source: Official CitySites)
  • Wikipedia Article on Area Code 303 (Source: Wikipedia)
  • State Information Resources for Colorado (Source: State Information)