303 Area Code Prefixes Directory

If you know the complete number you’re looking up, please use the Phone Number Search above. Or to explore prefixes in different coverage areas, please use the tables below.

Qwest Corp.
Carrier

Coverage Area
Counties: Denver, , Douglas, Boulder, Clear Creek, Adams, Larimer, Weld
Cities: Denver, Golden, Aurora, Littleton, Longmont, Hudson, Idaho Springs, Brighton, Sedalia, Keenesburg, Allenspark, Lyons, Fort Lupton

American Messaging (am)
Carrier

Coverage Area
Counties: Denver
Cities: Denver

Contact Paging Of Colorado
Carrier

Coverage Area
Counties: Denver
Cities: Denver

Global Crossing Local Services-co
Carrier

Coverage Area
Counties: Denver, , Adams
Cities: Denver, Aurora, Brighton

N.e. Colorado Cellular
Carrier

Coverage Area
Counties: Denver
Cities: Denver

AT&T Local
Carrier

Coverage Area
Counties: Denver
Cities: Denver

Convergent Communications
Carrier

Coverage Area
Counties: Denver
Cities: Denver

Comcast Phone Of Colorado
Carrier

Coverage Area
Counties: Denver, Adams
Cities: Denver, Brighton

Xo Colorado
Carrier

Coverage Area
Counties: Denver,
Cities: Denver, Englewood

Elbert County Wireless
Carrier

Coverage Area
Counties: Denver
Cities: Denver

360networks (usa) Inc.
Carrier

Coverage Area
Counties: Denver,
Cities: Denver, Keenesburg

T-mobile Usa
Carrier

Coverage Area
Counties: Denver
Cities: Denver

Cbeyond Communications
Carrier

Coverage Area
Counties: Denver, Weld
Cities: Denver, Fort Lupton

Mcleodusa Telecommunications Services- Co
Carrier

Coverage Area
Counties: Denver, Boulder
Cities: Denver, Longmont

Live Wire Networks
Carrier

Coverage Area
Counties: Denver
Cities: Denver

Level 3 Communications
Carrier

Coverage Area
Counties: , Denver, Adams, Clear Creek
Cities: Hudson, Keenesburg, Aurora, Denver, Brighton, Idaho Springs

Eschelon Telecom Of Colorado
Carrier

Coverage Area
Counties: , Denver
Cities: Aurora, Denver

4dvision
Carrier

Coverage Area
Counties: Denver
Cities: Denver

Strasburg Telephone Co.
Carrier

Coverage Area
Cities: Strasburg

Eastern Slope Rural Telephone Association
Carrier

Coverage Area
Cities: Bennett

Big River Telephone Company - MO
Carrier

Coverage Area
Counties: Denver
Cities: Denver

Communications Unlimited
Carrier

Coverage Area
Counties: Denver
Cities: Denver

Ymax Communications Corp.
Carrier

Coverage Area
Cities: Deer Trail

Bijou Telephone Cooperative Association
Carrier

Coverage Area
Cities: Deer Trail, Byers

Tw Telecom Of Colorado LLC
Carrier

Coverage Area
Counties: Denver
Cities: Denver

Interlink Adv Svc D/b/a Forethought.net
Carrier

Coverage Area
Counties: Denver
Cities: Denver

Roggen Telephone Cooperative Co.
Carrier

Coverage Area
Cities: Roggen

Iloka DBA Newcloud Networks
Carrier

Coverage Area
Counties: Denver
Cities: Denver

Neutral Tandem-colorado
Carrier

Coverage Area
Counties: Denver
Cities: Denver

Pac - West Telecomm
Carrier

Coverage Area
Counties: Denver
Cities: Denver

The 303 area code is located in Denver, Colorado including Aurora, Golden and was originally put into service on February 4th 1994. Find whose number this is.

Recently Reported Numbers

(303) 317-8431Neutral

Dept Collector representing state of Colorado, Call is being recorded and they have my address and some of my SSN, said they sent me a notice, but haven't received anything!

(303) 656-2003Dangerous

Has called a couple of times so far. Caller ID says 'Denver, CO'. Leaves no voicemail. Obviously a scam.

(303) 323-8690Unknown

Pay your bills and you won't get called. Stop being such a huge deadbeat.

(303) 578-5918Dangerous

3035785918. Robo scammer.

(303) 543-5412Dangerous

VM: 2 seconds of background noise.

(303) 323-5193Dangerous

303-323-5193 called immediately after calling from another number, 720-699-1710. These are apparently call center scammers overseas whom routinely spoof numbers and call with a series of live scam artists, and pre recorded greetings. Listen, you scam caller idiots, when you call with the same robo scam from different numbers, it's rather obvious you are scamming. These people deserve to be in p

(303) 004-4741Unknown

Calling repeatedly

(303) 494-8930Unknown

Received a phone call from this number. The caller did not leave any message.

(303) 921-3154Dangerous

7 ring hang up.

(303) 841-9000Unknown

I received one just today, August 5, 2020. The spam filter service from my wireless provider blocked the call as spam. I saw it later in notifications.

Recently Searched Numbers

No additional information reported for these searched numbers. Received a call from any phone number listed below? Please consider helping the community by reporting your experience.

303-289-8092
Report
Qwest Corp.
303-585-2967
Report
Qwest Corp.
303-485-4644
Report
Qwest Corp.
303-558-4962
Report
Global Crossing Local Services-co
303-903-5970
Report
Cellco Partnership DBA Verizon Wireless
303-615-6444
Report
Qwest Corp.
303-252-7228
Report
Qwest Corp.
303-378-1611
Report
New Cingular Wireless PCS
303-364-8646
Report
Qwest Corp.
303-688-6149
Report
Qwest Corp.
303-493-8228
Report
Icg Telecom Group
303-374-9958
Report
Teleport Communications America
303-296-4128
Report
Qwest Corp.
303-272-5579
Report
Qwest Corp.
303-995-9094
Report
Sprint Spectrum
303-138-9854
Report
UNKNOWN
303-239-3288
Report
Qwest Corp.
303-422-7268
Report
Qwest Corp.
303-163-5673
Report
UNKNOWN

Most searched numbers

Cell
All TimeThis Month
303-411-7222First seen 2018-12-19303-360-8195First seen 2013-01-08
303-979-6924First seen 2018-05-20303-721-8616First seen 2016-01-26
303-550-3077First seen 2017-08-09303-651-2429First seen 2017-09-10
303-902-5447First seen 2013-01-31303-294-6749First seen 2015-06-27
303-757-2840First seen 2011-01-30303-212-7757First seen 2016-10-01
Landline
All TimeThis Month
303-653-2002First seen 2015-12-24303-421-2780First seen 2017-01-06
303-276-1544First seen 2011-09-12303-596-6608First seen 2015-12-09
303-845-4001First seen 2011-03-07303-582-7973First seen 2013-05-03
303-933-2370First seen 2015-10-09303-279-6128First seen 2011-07-25
303-398-7660First seen 2014-10-18303-692-2862First seen 2016-10-03

Cities With coverage

CITY LIST
Allenspark
Aurora
Bennett
Brighton
Byers
Deer Trail
Denver
Englewood
Fort Lupton
Golden
Hudson
Idaho Springs
Keenesburg
Littleton
Longmont
Louisville
Lyons
Roggen
Sedalia
Strasburg