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area codes: 200, 300, 400, 500, 600, 700, 800, 900
| Area Code | State | City |
| 301 | MD | W Maryland: Silver Spring, Frederick |
| 302 | DE | Delaware |
| 303 | CO | Central Colorado: Denver |
| 304 | WV | West Virginia |
| 305 | FL | SE Florida: Miami |
| 306 | SK | Saskatchewan Canada |
| 307 | WY | Wyoming |
| 308 | NE | West Nebraska |
| 309 | IL | West Central Illinois |
| 310 | CA | South California: Los Angeles |
| 311 | - | Reserved / Municipal Assistance. |
| 312 | IL | Chicago, Illinois (Downtown only) |
| 313 | MI | Detroit and suburbs |
| 314 | MO | SE Missouri: St Louis metro area only |
| 315 | NY | North Central New York |
| 316 | KS | South Kansas |
| 317 | IN | Central Indiana |
| 318 | LA | Northern Louisiana |
| 319 | IA | East Iowa |
| 320 | MN | Central. Minnesota |
| 321 | FL | Florida |
| 323 | CA | Los Angeles |
| 325 | TX | Central Texas |
| 330 | OH | NE Ohio: Arkon, Canton, and Youngstown area |
| 331 | IL | NE Illinois |
| 334 | AL | South Alabama |
| 336 | NC | Central North Carolina |
| 337 | LA | SW Louisiana |
| 339 | MA | Boston Massachusetts |
| 340 | US Virgin Islands | |
| 345 | Cayman Islands | |
| 347 | NY | New York |
| 351 | MA | North Massachusetts |
| 352 | FL | Florida |
| 353 | WI | Wisconsin |
| 354 | FL | Florida |
| 356 | NJ | New Jersey |
| 358 | PA | Pennsylvania |
| 360 | WA | W. Washington State |
| 361 | TX | South Texas: Corpus Christi |
| 369 | CA | California |
| 380 | OH | Ohio |
| 383 | ME | Maine |
| 384 | OH | Ohio |
| 385 | UT | Utah |
| 386 | FL | Daytona Beach, Florida |
