| AREA CODE | NUMBER OF PREFIXES | STATE |
|---|---|---|
| 301 | 778 | Maryland |
| 302 | 566 | Delaware |
| 303 | 782 | Colorado |
| 304 | 783 | West Virginia |
| 305 | 775 | Florida |
| 307 | 404 | Wyoming |
| 308 | 436 | Nebraska |
| 309 | 673 | Illinois |
| 310 | 787 | California |
| 312 | 783 | Illinois |
| 313 | 683 | Michigan |
| 314 | 730 | Missouri |
| 315 | 772 | New York |
| 316 | 402 | Kansas |
| 317 | 780 | Indiana |
| 318 | 656 | Louisiana |
| 319 | 462 | Iowa |
| 320 | 433 | Minnesota |
| 321 | 396 | Florida |
| 323 | 785 | California |
| 325 | 314 | Texas |
| 330 | 780 | Ohio |
| 331 | 128 | Illinois |
| 334 | 651 | Alabama |
| 336 | 772 | North Carolina |
| 337 | 534 | Louisiana |
| 339 | 72 | Massachusetts |
| 347 | 771 | New York |
| 351 | 27 | Massachusetts |
| 352 | 567 | Florida |
| 360 | 775 | Washington |
| 361 | 459 | Texas |
| 385 | 252 | Utah |
| 386 | 341 | Florida |
| 306 | Saskathcewan | |
| 332 | 39 | New York |
| 343 | Ontario | |
| 346 | 290 | Texas |
| 365 | Ontario | |
| 341 | 2 | California |
| 364 | 11 | Kentucky |
| 369 | California | |
| 380 | 27 | Ohio |
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