AreaCodeLocations.info

Share

Area Code 303

Area code 303 is in Colorado, USA, spanning 14 counties and serving 74 cities, including Denver, Aurora or Lakewood; it currently uses 783 prefixes, assigned from 303-200-XXXX through 303-999-XXXX.

In service since January 01, 1947, area code 303 is the parent Numbering Plan Area in overlay complex 303/720/983.

The current local time is 12:54:11 AM (Mountain Time Zone).

303 area code location on a map

© OpenStreetMap contributors
For exact boundaries see official 303 area code map

More Colorado area codes:

Reverse phone lookup

Locate any 303-NXX prefix:

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	6/1/2005
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 central office codes assigned before 2001.

Top

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 USA area code 303. When multiple places in a US state 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 12:54:11 AM).

Top