Area Code | Region | UTC Offset | DST Observed | Description |
|---|
| 307 | WY | -7 | | Wyoming |
| 308 | NE | -6 | | W Nebraska: North Platte |
| 309 | IL | -6 | | W Cent. Illinois: Peoria |
| 310 | CA | -8 | | S California: Beverly Hills, West Hollywood, West Los Angeles (see split 562; overlay 424 -- approval denied) |
| 311 | -- | -- | | Reserved for special applications |
| 312 | IL | -6 | | Illinois: Chicago (downtown only -- in the loop; see 773; overlay 872) |
| 313 | MI | -5 | | Michigan: Detroit and suburbs (see 734, overlay 679) |
| 314 | MO | -6 | | SE Missouri: St Louis city and parts of the metro area only (see 573, 636, overlay 557) |
| 315 | NY | -5 | | N Cent. New York: Syracuse |
| 316 | KS | -6 | | S Kansas: Wichita (see split 620) |
| 317 | IN | -5 | N | Cent. Indiana: Indianapolis (see 765) |
| 318 | LA | -6 | | N Louisiana: Shreveport, Ruston, Monroe, Alexandria (see split 337) |
| 319 | IA | -6 | | E Iowa: Cedar Rapids (see split 563) |
| 320 | MN | -6 | | Cent. Minnesota: Saint Cloud (rural Minn, excl St. Paul/Minneapolis) |
| 321 | FL | -5 | | Florida: Brevard County, Cape Canaveral area; Metro Orlando (split from 407) |
| 323 | CA | -8 | | S California: Los Angeles (outside downtown: Hollywood; split from 213) |
| 325 | TX | -6 | | Central Texas: Abilene, Sweetwater, Snyder, San Angelo (split from 915) |
| 330 | OH | -5 | | NE Ohio: Akron, Canton, Youngstown; Mahoning County, parts of Trumbull/Warren counties (see splits 216, 440, overlay 234) |
| 331 | IL | -6 | | W NE Illinois, western suburbs of Chicago (part of what used to be 708; overlaid on 630; assigned but not in use) |
| 334 | AL | -6 | | S Alabama: Auburn/Opelika, Montgomery and coastal areas (part of what used to be 205; see also 256, split 251) |
| 336 | NC | -5 | | Cent. North Carolina: Greensboro (split from 910) |
| 337 | LA | -6 | | SW Louisiana: Lake Charles, Lafayette (see split 318) |
| 339 | MA | -5 | | Massachusetts: Boston suburbs, to the south and west (see splits 617, 508; overlaid on 781, eff 5/2/2001) |
| 340 | -- | -4 | N | US Virgin Islands (see also 809) |
| 341 | CA | -8 | | (overlay on 510; SUSPENDED) |
| 345 | -- | -5 | | Cayman Islands |
| 347 | NY | -5 | | New York (overlay for 718: NYC area, except Manhattan) |
| 351 | MA | -5 | | Massachusetts: north of Boston to NH, 508, and 781 (overlaid on 978, eff 4/2/2001) |
| 352 | FL | -5 | | Florida: Gainesville area, Ocala, Crystal River (split from 904) |
| 360 | WA | -8 | | W Washington State: Olympia, Bellingham (except Seattle area; part of what used to be 206; see overlay 564) |
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