Area Code | Region | UTC Offset | DST Observed | Description |
|---|
| 240 | MD | -5 | | W Maryland: Silver Spring, Frederick, Gaithersburg (overlay, see 301) |
| 242 | -- | -5 | | Bahamas |
| 246 | -- | -4 | | Barbados |
| 248 | MI | -5 | | Michigan: Oakland County, Pontiac (split from 810; see overlay 947) |
| 250 | BC | -8 | | Canada: British Columbia (see 604) |
| 251 | AL | -6 | | S Alabama: Mobile and coastal areas, Jackson, Evergreen, Monroeville (split from 334, eff 6/18/01; see also 205, 256) |
| 252 | NC | -5 | | E North Carolina (Rocky Mount; split from 919) |
| 253 | WA | -8 | | Washington: South Tier - Tacoma, Federal Way (split from 206, see also 425; overlay 564) |
| 254 | TX | -6 | | Central Texas (Waco, Stephenville; split, see 817, 940) |
| 256 | AL | -6 | | E and N Alabama (Huntsville, Florence, Gadsden; split from 205; see also 334) |
| 260 | IN | -5 | N | NE Indiana: Fort Wayne (see 219) |
| 262 | WI | -6 | | SE Wisconsin: counties of Kenosha, Ozaukee, Racine, Walworth, Washington, Waukesha (split from 414) |
| 264 | -- | -4 | | Anguilla (split from 809) |
| 267 | PA | -5 | | SE Pennsylvania: Philadelphia (see 215) |
| 268 | -- | -4 | | Antigua and Barbuda (split from 809) |
| 269 | MI | -5 | | SW Michigan: Kalamazoo, Saugatuck, Hastings, Battle Creek, Sturgis to Lake Michigan (split from 616) |
| 270 | KY | -6 | | W Kentucky: Bowling Green, Paducah (split from 502) |
| 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 |
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