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U.S. Area Codes by Number: 3
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US AREA CODES STARTING WITH THE NUMBER 3
301
Maryland
321
Florida
302
Delaware
323
California
303
Colorado
330
Ohio
304
West Virginia
331
Illinois
305
Florida
334
Alabama
307
Wyoming
336
North Carolina
308
Nebraska
337
Louisiana
309
Illinois
339
Massachusetts
310
California
341
California
312
Illinois
347
New York
313
Michigan
351
Massachusetts
314
Missouri
352
Florida
315
New York
360
Washington
316
Kansas
361
Texas
317
Indiana
369
California
318
Louisiana
385
Utah
319
Iowa
386
Florida
320
Minnesota
