This page lists all area codes starting with 3 that are accessible from the U.S. and Canada, the state the area code belongs to, and the time zone of all area codes.
Please click on the first digit of the area code if you need to find information on another area code:
2 . 3 .
4 . 5 .
6 . 7 .
8 . 9 . Time Zone . By State
3xx Area Codes Table
| Area Code |
Country |
State |
Time Zone |
| 301 | US | Maryland | Eastern Time Zone |
| 302 | US | Delaware | Eastern Time Zone |
| 303 | US | Colorado | Mountain Time Zone |
| 304 | US | West Virginia | Eastern Time Zone |
| 305 | US | Florida | Eastern Time Zone |
| 306 | Canada | Saskatchewan | Central Time Zone, Mountain Time Zone |
| 307 | US | Wyoming | Mountain Time Zone |
| 308 | US | Nebraska | Central Time Zone, Mountain Time Zone |
| 309 | US | Illinois | Central Time Zone |
| 310 | US | California | Pacific Time Zone |
| 311 | Unassigned |
| 312 | US | Illinois | Central Time Zone |
| 313 | US | Michigan | Eastern Time Zone |
| 314 | US | Missouri | Central Time Zone |
| 315 | US | New York | Eastern Time Zone |
| 316 | US | Kansas | Central Time Zone |
| 317 | US | Indiana | Central Time Zone |
| 318 | US | Louisiana | Central Time Zone |
| 319 | US | Iowa | Central Time Zone |
| 320 | US | Minnesota | Central Time Zone |
| 321 | US | Florida | Eastern Time Zone |
| 322 | Unassigned |
| 323 | US | California | Pacific Time Zone |
| 324 | Unassigned |
| 325 | US | Texas | Central Time Zone |
| 326 | Unassigned |
| 327 | US | Arkansas | Central Time Zone |
| 328 | Unassigned |
| 329 | Unassigned |
| 330 | US | Ohio | Eastern Time Zone |
| 331 | US | Illinois | Central Time Zone |
| 332 | Unassigned |
| 333 | Unassigned |
| 334 | US | Alabama | Central Time Zone |
| 335 | Unassigned |
| 336 | US | North Carolina | Eastern Time Zone |
| 337 | US | Louisiana | Central Time Zone |
| 338 | Unassigned |
| 339 | US | Massachusetts | Eastern Time Zone |
| 340 | US Virgin Islands | | Atlantic Time Zone |
| 341 | US | California | Pacific Time Zone |
| 342 | Unassigned |
| 343 | Canada | Ontario | Eastern Time Zone |
| 344 | Unassigned |
| 345 | Cayman Islands | | Eastern Time Zone |
| 346 | US | Texas | Central Time Zone |
| 347 | US | New York | Eastern Time Zone |
| 348 | Unassigned |
| 349 | Unassigned |
| 350 | Unassigned |
| 351 | US | Massachusetts | Eastern Time Zone |
| 352 | US | Florida | Eastern Time Zone |
| 353 | Unassigned |
| 354 | Unassigned |
| 355 | Unassigned |
| 356 | Unassigned |
| 357 | Unassigned |
| 358 | Unassigned |
| 359 | Unassigned |
| 360 | US | Washington | Pacific Time Zone |
| 361 | US | Texas | Central Time Zone |
| 362 | Unassigned |
| 363 | Unassigned |
| 364 | US | Kentucky | Central Time Zone |
| 365 | Canada | Ontario | Eastern Time Zone |
| 366 | Unassigned |
| 367 | Unassigned |
| 368 | Unassigned |
| 369 | US | California | Pacific Time Zone |
| 370 | Unassigned |
| 371 | Unassigned |
| 372 | Unassigned |
| 373 | Unassigned |
| 374 | Unassigned |
| 375 | Unassigned |
| 376 | Unassigned |
| 377 | Unassigned |
| 378 | Unassigned |
| 379 | Unassigned |
| 380 | US | Ohio | Eastern Time Zone |
| 381 | Unassigned |
| 382 | Unassigned |
| 383 | Unassigned |
| 384 | Unassigned |
| 385 | US | Utah | Mountain Time Zone |
| 386 | US | Florida | Eastern Time Zone |
| 387 | Unassigned |
| 388 | Unassigned |
| 389 | Unassigned |
| 390 | Unassigned |
| 391 | Unassigned |
| 392 | Unassigned |
| 393 | Unassigned |
| 394 | Unassigned |
| 395 | Unassigned |
| 396 | Unassigned |
| 397 | Unassigned |
| 398 | Unassigned |
| 399 | Unassigned |
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Note: Area codes in gray represents the location is outside of the 50 states of the U.S. and Canada.
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