NANP Area Code History: 1947

Although the charts below represent the final assignments approved in October 1947, the implementation schedule was a different matter entirely. The first customer-dialed call involving any area code would not take place until late 1951. This plan was chose primarily to avoid confusion of numerically-adjacent area codes in the same state, which may have caused customer confusion. Additionally, the most populous areas were given the fewest number of dial-pulls (as telephone technology was still pulse-based). [View map of these assignments]

* - Canadian Maritime Provinces
RED - Unassigned for future use
GREEN - Part of the Original Assigned Codes
GRAY - To remain unassigned for local service use

201-NJ	301-MD	401-RI	501-AR	601-MS	701-ND	801-UT	901-TN
202-DC	302-DE	402-NE	502-KY	602-AZ	702-NV	802-VT	902-*
203-CT	303-CO	403-AB	503-OR	603-NH	703-VA	803-SC	903
204-MB	304-WV	404-GA	504-LA	604-BC	704-NC	804	904
205-AL	305-FL	405-OK	505-NM	605-SD	705	805	905
206-WA	306-SK	406-MT	506	606	706	806	906
207-ME	307-WY	407	507	607	707	807	907
208-ID	308	408	508	608	708	808	908
209	309	409	509	609	709	809	909
200	300	400	500	600	700	800	900

211	311	411	511	611	711	811	911
212-NY	312-IL	412-PA	512-TX	612-MN	712-IA	812-IN	912
213-CA	313-MI	413-MA	513-OH	613-ON	713-TX	813	913-KS
214-TX	314-MO	414-WI	514-QC	614-OH	714	814-PA	914-NY
215-PA	315-NY	415-CA	515-IA	615	715-WI	815-IL	915-TX
216-OH	316-KS	416-ON	516	616-MI	716-NY	816-MO	916-CA
217-IL	317-IN	417	517-MI	617-MA	717-PA	817	917
218-MN	318	418-QC	518-NY	618-IL	718	818	918
219	319-IA	419-OH	519	619	719	819	919
210	310	410	510	610	710	810	910

NANPA

FCC

Telecom Digest

NANC

CNAC