Area Code | Region | UTC Offset | DST Observed | Description |
|---|
| 276 | VA | -5 | | S and SW Virginia: Bristol, Stuart, Martinsville (split from 540; perm 9/1/01, mand 3/16/02) |
| 278 | MI | -5 | | Michigan (overlaid on 734, SUSPENDED) |
| 281 | TX | -6 | | Texas: Houston Metro (split 713; overlay 832) |
| 283 | OH | -5 | | SW Ohio: Cincinnati (cancelled: overlaid on 513) |
| 284 | -- | -4 | | British Virgin Islands (split from 809) |
| 289 | ON | -5 | | Canada: S Cent. Ontario: Greater Toronto Area -- Durham, Halton, Hamilton-Wentworth, Niagara, Peel, York, and southern Simcoe County (excluding Toronto -- overlaid on 905, eff 6/9/01) |
| 301 | MD | -5 | | W Maryland: Silver Spring, Frederick, Camp Springs, Prince George's County (see 240) |
| 302 | DE | -5 | | Delaware |
| 303 | CO | -7 | | Central Colorado: Denver (see 970, also 720 overlay) |
| 304 | WV | -5 | | West Virginia |
| 305 | FL | -5 | | SE Florida: Miami, the Keys (see 786, 954; 239) |
| 306 | SK | -7 | | Canada: Saskatchewan |
| 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) |
| 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) |
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