Area Code | Region | UTC Offset | DST Observed | Description |
|---|
| 307 | WY | -7 | | Wyoming |
| 385 | UT | -7 | | Utah: Salt Lake City Metro (split from 801, eff 3/30/02 POSTPONED; see also 435) |
| 403 | AB | -7 | | Canada: Southern Alberta (see 780, 867) |
| 406 | MT | -7 | | Montana |
| 432 | TX | -7 | | W Texas: Big Spring, Midland, Odessa (split from 915, eff 4/5/2003) |
| 435 | UT | -7 | | Rural Utah outside Salt Lake City metro (see split 801) |
| 480 | AZ | -7 | N | Arizona: East Phoenix (see 520; also Phoenix split 602, 623) |
| 505 | NM | -7 | | New Mexico |
| 520 | AZ | -7 | N | SE Arizona: Tucson area (split from 602; see split 928) |
| 602 | AZ | -7 | N | Arizona: Phoenix (see 520; also Phoenix split 480, 623) |
| 623 | AZ | -7 | N | Arizona: West Phoenix (see 520; also Phoenix split 480, 602) |
| 719 | CO | -7 | | SE Colorado: Pueblo, Colorado Springs |
| 720 | CO | -7 | | Central Colorado: Denver (overlaid on 303) |
| 780 | AB | -7 | | Canada: Northern Alberta, north of Lacombe (see 403) |
| 801 | UT | -7 | | Utah: Salt Lake City Metro (see split 385, eff 3/30/02; see also split 435) |
| 915 | TX | -7 | | W Texas: El Paso (see splits 325 eff 4/5/03; 432, eff 4/5/2003) |
| 928 | AZ | -7 | N | Central and Northern Arizona: Prescott, Flagstaff, Yuma (split from 520) |
| 957 | NM | -7 | | New Mexico (pending; region unknown) |
| 970 | CO | -7 | | N and W Colorado (part of what used to be 303) |
| 52 | MX | -6 | | Mexico: Mexico City area (country code + city code) |
| 55 | MX | -6 | | Mexico: Mexico City area (country code + city code) |
| 204 | MB | -6 | | Canada: Manitoba |
| 205 | AL | -6 | | Central Alabama (including Birmingham; excludes the southeastern corner of Alabama and the deep south; see splits 256 and 334) |
| 210 | TX | -6 | | S Texas: San Antonio (see also splits 830, 956) |
| 214 | TX | -6 | | Texas: Dallas Metro (overlays 469/972) |
| 217 | IL | -6 | | Cent. Illinois: Springfield |
| 218 | MN | -6 | | N Minnesota: Duluth |
| 219 | IN | -6 | | NW Indiana: Gary (see split 574, 260) Also -5 timez0ne |
| 224 | IL | -6 | | Northern NE Illinois: Evanston, Waukegan, Northbrook (overlay on 847, eff 1/5/2002) |
| 225 | LA | -6 | | Louisiana: Baton Rouge, New Roads, Donaldsonville, Albany, Gonzales, Greensburg, Plaquemine, Vacherie (split from 504) |
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