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303 Area Code

Area code 303 is in Colorado (CO), USA and some of the main locations it covers are Denver, Aurora, Lakewood, etc. (jump to city list below).

In service since January 01, 1947, area code 303 is the parent Numbering Plan Area in overlay complex 303/720/983 (overlaying NPAs cover the same area).

The current time for places served by area code 303 is 04:19:15 PM (Mountain Time Zone).

Reverse phone lookup

Map of area code 303

More Colorado area codes

303 phone number location

NPANXX	Area served¹	Date²
303-200	Denver	N/A
303-201	Denver	N/A
303-202	Denver	N/A
303-203	Denver	N/A
303-204	Denver	N/A
303-205	Denver	N/A
303-206	Denver	N/A
303-207	Denver	N/A
303-208	Denver	N/A
303-209	Denver	N/A
303-210	Denver	N/A
303-212	Denver	N/A
303-213	Denver	N/A
303-214	Denver	N/A
303-215	Denver	N/A
303-216	Denver	N/A
303-217	Denver	N/A
303-218	Denver	N/A
303-219	Denver	N/A
303-220	Denver	N/A
303-221	Denver	N/A
303-222	Denver	N/A
303-223	Denver	N/A
303-224	Denver	N/A
303-225	Denver	N/A
303-226	Denver	N/A
303-227	Denver	N/A
303-228	Denver	N/A
303-229	Denver	N/A
303-230	Denver	N/A
303-231	Denver	N/A
303-232	Denver	N/A
303-233	Denver	N/A
303-234	Denver	N/A
303-235	Denver	N/A
303-236	Denver	N/A
303-237	Denver	N/A
303-238	Denver	N/A
303-239	Denver	N/A
303-240	Denver	N/A
303-241	Denver	N/A
303-242	Denver	N/A
303-243	Denver	N/A
303-244	Denver	N/A
303-245	Denver	N/A
303-246	Denver	N/A
303-247	Denver	N/A
303-248	Denver	N/A
303-249	Denver	N/A
303-250	Denver	N/A
303-251	Denver	N/A
303-252	Denver	N/A
303-253	Denver	N/A
303-254	Denver	N/A
303-255	Denver	N/A
303-256	Denver	N/A
303-257	Denver	N/A
303-258	Denver	N/A
303-259	Denver	N/A
303-260	Denver	N/A
303-261	Denver	N/A
303-262	Denver	N/A
303-263	Denver	N/A
303-264	Denver	N/A
303-265	Denver	N/A
303-266	Denver	N/A
303-267	Denver	N/A
303-268	Denver	N/A
303-269	Denver	N/A
303-270	Denver	N/A
303-271	Denver	N/A
303-272	Denver	N/A
303-273	Denver	N/A
303-274	Denver	N/A
303-275	Denver	N/A
303-276	Denver	8/19/2021
303-277	Denver	N/A
303-278	Denver	N/A
303-279	Denver	N/A
303-280	Denver	N/A
303-281	Denver	N/A
303-282	Denver	N/A
303-283	Denver	N/A
303-284	Denver	N/A
303-285	Denver	N/A
303-286	Denver	N/A
303-287	Denver	N/A
303-288	Denver	N/A
303-289	Denver	N/A
303-290	Denver	N/A
303-291	Denver	N/A
303-292	Denver	N/A
303-293	Denver	N/A
303-294	Denver	N/A
303-295	Denver	N/A
303-296	Denver	N/A
303-297	Denver	N/A
303-298	Denver	N/A
303-299	Denver	N/A

NPANXX	Area served¹	Date²
303-300	Denver	N/A
303-301	Denver	N/A
303-302	Denver	N/A
303-304	Fort Lupton	11/18/2004
303-305	Denver	N/A
303-306	Denver	N/A
303-307	Denver	N/A
303-308	Denver	N/A
303-309	Denver	N/A
303-310	Denver	N/A
303-312	Denver	N/A
303-313	Denver	N/A
303-314	Denver	N/A
303-315	Denver	N/A
303-316	Denver	N/A
303-317	Denver	N/A
303-318	Denver	N/A
303-319	Denver	8/12/2004
303-320	Denver	N/A
303-321	Denver	N/A
303-322	Denver	N/A
303-323	Denver	N/A
303-324	Denver	N/A
303-325	Denver	N/A
303-326	Denver	N/A
303-327	Denver	N/A
303-328	Denver	N/A
303-329	Denver	N/A
303-330	Denver	3/9/2006
303-331	Denver	N/A
303-332	Denver	N/A
303-333	Denver	N/A
303-334	Denver	N/A
303-335	Denver	N/A
303-336	Denver	N/A
303-337	Denver	N/A
303-338	Denver	N/A
303-339	Denver	12/15/2003
303-340	Denver	N/A
303-341	Denver	N/A
303-342	Denver	N/A
303-343	Denver	N/A
303-344	Denver	N/A
303-345	Denver	N/A
303-346	Denver	N/A
303-347	Denver	N/A
303-348	Denver	N/A
303-349	Denver	N/A
303-350	Denver	N/A
303-351	Deckers	11/8/2006
303-352	Denver	N/A
303-353	Denver	N/A
303-354	Denver	N/A
303-355	Denver	N/A
303-356	Denver	N/A
303-357	Denver	N/A
303-358	Denver	N/A
303-359	Denver	N/A
303-360	Denver	N/A
303-361	Denver	N/A
303-362	Denver	N/A
303-363	Denver	N/A
303-364	Denver	N/A
303-365	Denver	N/A
303-366	Denver	N/A
303-367	Denver	N/A
303-368	Denver	N/A
303-369	Denver	N/A
303-370	Denver	N/A
303-371	Denver	N/A
303-372	Denver	N/A
303-373	Denver	N/A
303-374	Denver	N/A
303-375	Denver	N/A
303-376	Denver	N/A
303-377	Denver	N/A
303-378	Denver	N/A
303-379	Denver	N/A
303-380	Denver	N/A
303-381	Denver	N/A
303-382	Denver	N/A
303-383	Denver	N/A
303-384	Denver	N/A
303-385	Denver	N/A
303-386	Denver	N/A
303-387	Denver	N/A
303-388	Denver	N/A
303-389	Denver	N/A
303-390	Denver	N/A
303-391	Denver	N/A
303-392	Denver	N/A
303-393	Denver	N/A
303-394	Denver	N/A
303-395	Denver	N/A
303-396	Denver	6/2005
303-397	Denver	N/A
303-398	Denver	N/A
303-399	Denver	N/A

NPANXX	Area served¹	Date²
303-400	Denver	N/A
303-401	Denver	N/A
303-402	Denver	N/A
303-403	Denver	N/A
303-404	Denver	N/A
303-405	Denver	N/A
303-406	Denver	N/A
303-407	Denver	N/A
303-408	Denver	N/A
303-409	Denver	N/A
303-410	Denver	N/A
303-412	Denver	N/A
303-413	Denver	N/A
303-414	Denver	N/A
303-415	Denver	N/A
303-416	Denver	N/A
303-417	Denver	N/A
303-418	Denver	N/A
303-419	Denver	N/A
303-420	Denver	N/A
303-421	Denver	N/A
303-422	Denver	N/A
303-423	Denver	N/A
303-424	Denver	N/A
303-425	Denver	N/A
303-426	Denver	N/A
303-427	Denver	N/A
303-428	Denver	N/A
303-429	Denver	N/A
303-430	Denver	N/A
303-431	Denver	N/A
303-432	Denver	N/A
303-433	Denver	N/A
303-434	Denver	N/A
303-435	Denver	N/A
303-436	Denver	N/A
303-437	Denver	N/A
303-438	Denver	N/A
303-439	Denver	N/A
303-440	Denver	N/A
303-441	Denver	N/A
303-442	Denver	N/A
303-443	Denver	N/A
303-444	Denver	N/A
303-445	Denver	N/A
303-446	Denver	N/A
303-447	Denver	N/A
303-448	Denver	N/A
303-449	Denver	N/A
303-450	Denver	N/A
303-451	Denver	N/A
303-452	Denver	N/A
303-453	Denver	N/A
303-454	Denver	N/A
303-455	Denver	N/A
303-456	Denver	N/A
303-457	Denver	N/A
303-458	Denver	N/A
303-459	Denver	N/A
303-460	Denver	N/A
303-461	Denver	N/A
303-462	Denver	N/A
303-463	Denver	N/A
303-464	Denver	N/A
303-465	Denver	N/A
303-466	Denver	N/A
303-467	Denver	N/A
303-468	Denver	5/24/2001
303-469	Denver	N/A
303-470	Denver	N/A
303-471	Denver	N/A
303-472	Denver	N/A
303-473	Denver	N/A
303-474	Denver	N/A
303-475	Denver	N/A
303-476	Denver	N/A
303-477	Denver	N/A
303-478	Denver	N/A
303-479	Denver	N/A
303-480	Denver	N/A
303-481	Denver	N/A
303-482	Denver	N/A
303-483	Denver	N/A
303-484	Denver	N/A
303-485	Longmont	N/A
303-486	Denver	N/A
303-487	Denver	N/A
303-488	Denver	N/A
303-489	Denver	N/A
303-490	Denver	N/A
303-491	Denver	N/A
303-492	Denver	N/A
303-493	Denver	N/A
303-494	Denver	N/A
303-495	Denver	N/A
303-496	Denver	4/8/2004
303-497	Denver	N/A
303-498	Denver	4/22/2005
303-499	Denver	N/A

NPANXX	Area served¹	Date²
303-500	Hudson	1/4/2005
303-501	Denver	1/26/2006
303-502	Fort Lupton	12/13/2005
303-503	Denver	N/A
303-504	Denver	N/A
303-505	Denver	11/9/2012
303-506	Fort Lupton	9/13/2001
303-507	Denver	N/A
303-508	Denver	N/A
303-509	Denver	N/A
303-510	Denver	N/A
303-512	Denver	N/A
303-513	Denver	2/15/2002
303-514	Denver	N/A
303-515	Denver	11/14/2011
303-516	Denver	N/A
303-517	Denver	N/A
303-518	Denver	N/A
303-519	Denver	N/A
303-520	Denver	N/A
303-521	Denver	N/A
303-522	Denver	N/A
303-523	Denver	N/A
303-524	Denver	N/A
303-525	Denver	N/A
303-526	Denver	N/A
303-527	Denver	N/A
303-528	Denver	N/A
303-529	Denver	10/7/2019
303-530	Denver	N/A
303-531	Denver	N/A
303-532	Longmont	N/A
303-533	Denver	N/A
303-534	Denver	N/A
303-535	Fort Lupton	N/A
303-536	Hudson	N/A
303-537	Denver	N/A
303-538	Denver	N/A
303-539	Denver	N/A
303-540	Denver	N/A
303-541	Denver	N/A
303-542	Denver	N/A
303-543	Denver	N/A
303-544	Denver	N/A
303-545	Denver	N/A
303-546	Denver	N/A
303-547	Denver	N/A
303-548	Denver	N/A
303-549	Denver	N/A
303-550	Denver	N/A
303-551	Denver	N/A
303-552	Denver	N/A
303-553	Denver	N/A
303-554	Denver	N/A
303-556	Denver	N/A
303-557	Denver	N/A
303-558	Denver	N/A
303-559	Denver	N/A
303-560	Denver	N/A
303-561	Denver	N/A
303-562	Denver	N/A
303-563	Denver	N/A
303-564	Denver	N/A
303-565	Denver	N/A
303-566	Denver	N/A
303-567	Denver	N/A
303-568	Denver	N/A
303-569	Georgetown	N/A
303-570	Denver	N/A
303-571	Denver	N/A
303-572	Denver	N/A
303-573	Denver	N/A
303-574	Denver	N/A
303-575	Denver	N/A
303-576	Denver	N/A
303-577	Denver	N/A
303-578	Keenesburg	9/12/2006
303-579	Denver	N/A
303-580	Denver	N/A
303-581	Denver	N/A
303-582	Denver	N/A
303-583	Denver	N/A
303-584	Denver	N/A
303-585	Denver	N/A
303-586	Denver	N/A
303-587	Denver	N/A
303-588	Denver	N/A
303-589	Denver	N/A
303-590	Denver	N/A
303-591	Denver	N/A
303-592	Denver	N/A
303-593	Denver	N/A
303-594	Denver	N/A
303-595	Denver	N/A
303-596	Denver	N/A
303-597	Denver	N/A
303-598	Denver	N/A
303-599	Denver	N/A

NPANXX	Area served¹	Date²
303-600	Denver	N/A
303-601	Denver	N/A
303-602	Denver	N/A
303-603	Denver	N/A
303-604	Denver	N/A
303-605	Denver	N/A
303-606	Denver	N/A
303-607	Denver	N/A
303-608	Denver	N/A
303-609	Denver	N/A
303-610	Denver	N/A
303-612	Denver	N/A
303-613	Denver	N/A
303-614	Denver	N/A
303-615	Denver	N/A
303-616	Denver	N/A
303-617	Denver	N/A
303-618	Denver	N/A
303-619	Denver	N/A
303-620	Denver	N/A
303-621	Denver	N/A
303-622	Strasburg	N/A
303-623	Denver	N/A
303-624	Denver	N/A
303-625	Denver	N/A
303-626	Denver	N/A
303-627	Denver	N/A
303-628	Denver	N/A
303-629	Denver	N/A
303-630	Denver	N/A
303-632	Denver	N/A
303-633	Denver	N/A
303-634	Denver	N/A
303-635	Denver	N/A
303-636	Denver	N/A
303-637	Denver	N/A
303-638	Denver	N/A
303-639	Denver	N/A
303-640	Denver	N/A
303-641	Denver	N/A
303-642	Denver	N/A
303-643	Denver	N/A
303-644	Bennett	N/A
303-645	Denver	N/A
303-646	Denver	N/A
303-647	Deckers	N/A
303-648	Denver	N/A
303-649	Denver	N/A
303-650	Denver	N/A
303-651	Longmont	N/A
303-652	Longmont	N/A
303-653	Denver	N/A
303-654	Denver	N/A
303-655	Denver	N/A
303-656	Denver	N/A
303-657	Denver	N/A
303-658	Denver	N/A
303-659	Denver	N/A
303-660	Denver	N/A
303-661	Denver	N/A
303-662	Denver	N/A
303-663	Denver	N/A
303-664	Denver	N/A
303-665	Denver	N/A
303-666	Denver	N/A
303-667	Denver	N/A
303-668	Denver	N/A
303-669	Denver	N/A
303-670	Denver	N/A
303-671	Denver	N/A
303-672	Denver	N/A
303-673	Denver	N/A
303-674	Denver	N/A
303-675	Denver	N/A
303-676	Denver	N/A
303-677	Denver	N/A
303-678	Longmont	N/A
303-679	Denver	N/A
303-680	Denver	N/A
303-681	Denver	N/A
303-682	Longmont	N/A
303-683	Denver	N/A
303-684	Longmont	N/A
303-685	Denver	N/A
303-686	Denver	N/A
303-687	Denver	N/A
303-688	Denver	N/A
303-689	Denver	N/A
303-690	Denver	N/A
303-691	Denver	N/A
303-692	Denver	N/A
303-693	Denver	N/A
303-694	Denver	N/A
303-695	Denver	N/A
303-696	Denver	N/A
303-697	Denver	N/A
303-698	Denver	N/A
303-699	Denver	N/A

NPANXX	Area served¹	Date²
303-701	Denver	N/A
303-702	Longmont	N/A
303-703	Denver	N/A
303-704	Denver	N/A
303-705	Denver	N/A
303-706	Denver	N/A
303-707	Denver	N/A
303-708	Denver	N/A
303-709	Longmont	N/A
303-710	Fort Lupton	N/A
303-712	Denver	N/A
303-713	Denver	N/A
303-714	Denver	N/A
303-715	Denver	N/A
303-716	Denver	N/A
303-717	Fort Lupton	N/A
303-718	Fort Lupton	N/A
303-719	Deer Trail	11/16/2006
303-720	Fort Lupton	6/13/2008
303-721	Denver	N/A
303-722	Denver	N/A
303-723	Denver	N/A
303-724	Denver	N/A
303-725	Denver	N/A
303-726	Denver	N/A
303-727	Denver	N/A
303-728	Denver	N/A
303-729	Denver	N/A
303-730	Denver	N/A
303-731	Denver	N/A
303-732	Keenesburg	N/A
303-733	Denver	N/A
303-734	Denver	N/A
303-735	Denver	N/A
303-736	Denver	N/A
303-737	Denver	N/A
303-738	Denver	N/A
303-739	Denver	N/A
303-740	Denver	N/A
303-741	Denver	N/A
303-742	Denver	N/A
303-743	Denver	N/A
303-744	Denver	N/A
303-745	Denver	N/A
303-746	Longmont	N/A
303-747	Allenspark/ Lyons	N/A
303-748	Denver	N/A
303-749	Denver	N/A
303-750	Denver	N/A
303-751	Denver	N/A
303-752	Denver	N/A
303-753	Denver	N/A
303-754	Denver	N/A
303-755	Denver	N/A
303-756	Denver	N/A
303-757	Denver	N/A
303-758	Denver	N/A
303-759	Denver	N/A
303-760	Denver	N/A
303-761	Denver	N/A
303-762	Denver	N/A
303-763	Denver	N/A
303-764	Denver	N/A
303-765	Denver	N/A
303-766	Denver	N/A
303-767	Denver	N/A
303-768	Denver	N/A
303-769	Deer Trail	N/A
303-770	Denver	N/A
303-771	Denver	N/A
303-772	Longmont	N/A
303-773	Denver	N/A
303-774	Longmont	N/A
303-775	Longmont	N/A
303-776	Longmont	N/A
303-777	Denver	N/A
303-778	Denver	N/A
303-779	Denver	N/A
303-780	Denver	N/A
303-781	Denver	N/A
303-782	Denver	N/A
303-783	Denver	N/A
303-784	Denver	N/A
303-785	Denver	N/A
303-786	Denver	N/A
303-787	Denver	N/A
303-788	Denver	N/A
303-789	Denver	N/A
303-790	Denver	N/A
303-791	Denver	N/A
303-792	Denver	N/A
303-793	Denver	N/A
303-794	Denver	N/A
303-795	Denver	N/A
303-796	Denver	N/A
303-797	Denver	N/A
303-798	Denver	N/A
303-799	Denver	N/A

NPANXX	Area served¹	Date²
303-800	Denver	N/A
303-801	Denver	N/A
303-802	Denver	N/A
303-803	Denver	N/A
303-804	Denver	N/A
303-805	Denver	N/A
303-806	Denver	N/A
303-807	Denver	N/A
303-808	Denver	N/A
303-809	Denver	N/A
303-810	Denver	N/A
303-812	Denver	N/A
303-813	Denver	N/A
303-814	Denver	N/A
303-815	Denver	2/3/2005
303-816	Deckers	N/A
303-817	Denver	N/A
303-818	Denver	N/A
303-819	Denver	N/A
303-820	Denver	N/A
303-821	Denver	N/A
303-822	Byers	N/A
303-823	Allenspark/ Lyons	N/A
303-824	Denver	N/A
303-825	Denver	N/A
303-826	Denver	N/A
303-827	Longmont	N/A
303-828	Denver	N/A
303-829	Denver	N/A
303-830	Denver	N/A
303-831	Denver	N/A
303-832	Denver	N/A
303-833	Denver	N/A
303-834	Longmont	9/27/2006
303-835	Denver	N/A
303-836	Denver	N/A
303-837	Denver	N/A
303-838	Deckers	N/A
303-839	Denver	N/A
303-840	Denver	N/A
303-841	Denver	N/A
303-842	Denver	N/A
303-843	Denver	N/A
303-844	Denver	N/A
303-845	Longmont	N/A
303-846	Denver	N/A
303-847	Denver	N/A
303-848	Longmont	N/A
303-849	Roggen	N/A
303-850	Denver	N/A
303-851	Denver	N/A
303-852	Denver	N/A
303-853	Denver	N/A
303-854	Denver	N/A
303-855	Denver	N/A
303-856	Denver	N/A
303-857	Fort Lupton	N/A
303-858	Denver	N/A
303-859	Denver	N/A
303-860	Denver	N/A
303-861	Denver	N/A
303-862	Denver	6/4/2005
303-863	Denver	N/A
303-864	Denver	N/A
303-865	Denver	N/A
303-866	Denver	N/A
303-867	Denver	11/4/2005
303-868	Denver	N/A
303-869	Denver	N/A
303-870	Denver	N/A
303-871	Denver	N/A
303-872	Denver	N/A
303-873	Denver	N/A
303-874	Denver	N/A
303-875	Denver	N/A
303-876	Denver	N/A
303-877	Denver	N/A
303-878	Denver	N/A
303-879	Denver	N/A
303-880	Denver	N/A
303-881	Denver	N/A
303-882	Denver	N/A
303-883	Denver	N/A
303-884	Denver	N/A
303-885	Denver	4/12/2001
303-886	Denver	4/12/2001
303-887	Denver	4/12/2001
303-888	Denver	N/A
303-889	Denver	N/A
303-890	Denver	N/A
303-891	Denver	N/A
303-892	Denver	N/A
303-893	Denver	N/A
303-894	Denver	N/A
303-895	Denver	N/A
303-896	Denver	N/A
303-897	Denver	N/A
303-898	Denver	N/A
303-899	Denver	N/A

NPANXX	Area served¹	Date²
303-900	Georgetown	1/10/2007
303-901	Denver	N/A
303-902	Denver	N/A
303-903	Denver	N/A
303-904	Denver	N/A
303-905	Denver	N/A
303-906	Denver	N/A
303-907	Denver	N/A
303-908	Denver	N/A
303-909	Denver	N/A
303-910	Denver	N/A
303-912	Denver	N/A
303-913	Denver	N/A
303-914	Denver	N/A
303-915	Denver	N/A
303-916	Denver	N/A
303-917	Denver	N/A
303-918	Denver	N/A
303-919	Denver	N/A
303-920	Denver	N/A
303-921	Denver	N/A
303-922	Denver	N/A
303-923	Denver	N/A
303-924	Denver	N/A
303-925	Denver	N/A
303-926	Denver	N/A
303-927	Denver	N/A
303-928	Denver	N/A
303-929	Denver	N/A
303-930	Denver	N/A
303-931	Denver	N/A
303-932	Denver	N/A
303-933	Denver	N/A
303-934	Denver	N/A
303-935	Denver	N/A
303-936	Denver	N/A
303-937	Denver	N/A
303-938	Denver	N/A
303-939	Denver	N/A
303-940	Denver	N/A
303-941	Denver	N/A
303-942	Denver	N/A
303-943	Denver	9/9/2021
303-944	Denver	N/A
303-945	Denver	N/A
303-946	Denver	N/A
303-947	Denver	N/A
303-948	Denver	N/A
303-949	Denver	N/A
303-951	Denver	N/A
303-952	Denver	N/A
303-953	Denver	N/A
303-954	Denver	N/A
303-955	Denver	N/A
303-956	Fort Lupton	N/A
303-957	Denver	N/A
303-960	Denver	N/A
303-961	Denver	N/A
303-962	Denver	7/14/2005
303-963	Denver	N/A
303-964	Denver	N/A
303-965	Denver	N/A
303-966	Denver	N/A
303-967	Denver	N/A
303-968	Denver	N/A
303-969	Denver	N/A
303-970	Deckers	3/31/2022
303-971	Denver	N/A
303-972	Denver	N/A
303-973	Denver	N/A
303-974	Denver	N/A
303-975	Denver	N/A
303-977	Denver	N/A
303-978	Denver	N/A
303-979	Denver	N/A
303-980	Denver	N/A
303-981	Denver	N/A
303-982	Denver	N/A
303-984	Denver	N/A
303-985	Denver	N/A
303-986	Denver	N/A
303-987	Denver	N/A
303-988	Denver	N/A
303-989	Denver	N/A
303-990	Fort Lupton	5/16/2006
303-991	Denver	N/A
303-992	Denver	N/A
303-993	Denver	3/27/2007
303-994	Denver	N/A
303-995	Denver	N/A
303-996	Denver	N/A
303-997	Denver	N/A
303-998	Denver	N/A
303-999	Denver	8/24/2007

For 'Area served' we list the rate center. In the North American Numbering Plan a rate center is a geographic area used to determine local calling boundaries for billing purposes. Its name is generally a locality, often not the only one served by an NPA-NXX combination.
Assignment date. N/A - mostly CO codes assigned before 2001.

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Cities in area code 303

City¹	County	Time²
Allenspark	Boulder	M
Arvada	Jefferson	M
Aurora	Adams	M
Bailey	Park	M
Bennett	Adams	M
Black Hawk	Gilpin	M
Bond	Eagle	M
Boulder	Boulder	M
Brighton	Adams	M
Broomfield	Broomfield	M
Buffalo Creek	Jefferson	M
Byers	Arapahoe	M
Castle Rock	Douglas	M
Central City	Gilpin	M
Commerce City	Adams	M
Conifer	Jefferson	M
Dacono	Weld	M
Deer Trail	Arapahoe	M
Denver	Adams	M
Dumont	Clear Creek	M
Dupont	Adams	M
Eastlake	Adams	M
Elbert	El Paso	M
Eldorado Springs	Boulder	M
Elizabeth	Elbert	M
Empire	Clear Creek	M
Englewood	Arapahoe	M
Erie	Weld	M
Evergreen	Jefferson	M
Firestone	Weld	M
Fort Lupton	Weld	M
Franktown	Douglas	M
Frederick	Weld	M
Georgetown	Clear Creek	M
Golden	Jefferson	M
Grant	Park	M
Henderson	Adams	M
Hereford	Weld	M
Highlands Ranch	Douglas	M
Hudson	Weld	M
Hygiene	Boulder	M
Idaho Springs	Clear Creek	M
Idledale	Jefferson	M
Indian Hills	Jefferson	M
Jamestown	Boulder	M
Keenesburg	Weld	M
Kiowa	Elbert	M
Kittredge	Jefferson	M
Lafayette	Boulder	M
Lakewood	Jefferson	M
Larkspur	Douglas	M
Littleton	Arapahoe	M
Longmont	Boulder	M
Louisville	Boulder	M
Louviers	Douglas	M
Lyons	Boulder	M
Morrison	Jefferson	M
Nederland	Boulder	M
Niwot	Boulder	M
Parker	Douglas	M
Pine	Jefferson	M
Pinecliffe	Boulder	M
Roggen	Weld	M
Rollinsville	Gilpin	M
Sedalia	Douglas	M
Sedgwick	Sedgwick	M
Shawnee	Park	M
Silver Plume	Clear Creek	M
Strasburg	Adams	M
Thornton	Adams	M
Ward	Boulder	M
Watkins	Adams	M
Westminster	Adams	M
Wheat Ridge	Jefferson	M

Listed above are most places served by area code 303. When multiple places in a state/province share the same name we list the largest one only. Cities with population over 50,000 are displayed in bold text.
M stands for Mountain Time Zone (currently 04:19:15 PM).

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303 Area Code

Reverse phone lookup

Map of area code 303

More Colorado area codes

303 phone number location

303-2XX-XXXX

303-3XX-XXXX

303-4XX-XXXX

303-5XX-XXXX

303-6XX-XXXX

303-9XX-XXXX

Cities in area code 303