| 900 | premium-rate telephone numbers |
| 901 | Tennessee (Memphis, Covington, Somerville and extreme southwestern Tennessee). Originally for the entire state. |
| 902 | Nova Scotia and Prince Edward Island |
| 903 | Texas (Tyler, Sherman, Longview, Marshall, Palestine, Jacksonville, Carthage, and Northeast Texas) |
| 904 | Florida (Jacksonville, St. Augustine, Starke, Green Cove Springs and northeastern Florida) |
| 905 | Ontario (Niagara Region, Hamilton, GTA suburbs and central southeastern Ontario, overlays with 289) |
| 906 | Michigan (Upper Peninsula) |
| 907 | Alaska (all) |
| 908 | New Jersey (Alpha, Washington, Elizabeth, Warren, Plainfield and west central New Jersey) |
| 909 | California (western portions of San Bernardino County, including Colton, Grand Terrace, Ontario, Claremont, Pomona, Chino, Redlands, Fontana) Formerly included 951, split off in 2004. |
| 910 | North Carolina (Fayetteville, Wilmington, Jacksonville, Lumberton and southeastern North Carolina) |
| 911 | Emergency Services |
| 912 | Georgia (Savannah, Statesboro, Vidalia, Waycross, Brunswick, Douglas and southeastern Georgia) |
| 913 | Kansas (Kansas City, Overland Park, Paola, Leavenworth and extreme eastern Kansas) |
| 914 | New York (Westchester County) |
| 915 | Texas (All of El Paso County and portion of Hudspeth County) |
| 916 | California (Sacramento area) |
| 917 | New York (New York City; cell phones overlays with 212, 347, 646, and 718) |
| 918 | Oklahoma (Tulsa, Bartlesville, McAlester, Muskogee, Henryetta and northeastern Oklahoma) |
| 919 | North Carolina (Raleigh, Durham, Chapel Hill, Oxford, Goldsboro and north central North Carolina) |
| 920 | Wisconsin (Appleton, Sheboygan, Oshkosh, Green Bay, Manitowoc, Fond Du Lac and eastern Wisconsin) |
| 925 | California (Concord, Walnut Creek, Martinez, Livermore, Pleasanton and Dublin areas) |
| 928 | Arizona (Flagstaff, Kingman, Prescott, Yuma and northern and western Arizona) |
| 931 | Tennessee (Middle Tennessee, excluding Greater Nashville: Clarksville, Columbia, Manchester, Cookeville), split from 615 |
| 935 | California This Area code is scheduled to provide numbering relief to Area code 619 but no date has been assigned for this to go into effect. |
| 936 | Texas (Nacogdoches, Lufkin, Conroe, Huntsville, Center and Southeast Texas) |
| 937 | Ohio (Marysville, Springfield, Dayton, Hillsboro and southwestern Ohio excluding Cincinnati area) |
| 939 | Puerto Rico (overlays with 787) |
| 940 | Texas (Vernon, Wichita Falls, Denton, Gainesville, Decatur and North Texas) |
| 941 | Florida (Gulf Coast immediately south of Tampa Bay: all of Manatee County, Sarasota County, and Charlotte County; includes Bradenton, Port Charlotte, Sarasota, Punta Gorda) |
| 947 | Michigan (Troy, Oakland County, Pontiac, Southfield, Rochester Hills and northwestern Detroit suburbs, overlays with 248) |
| 949 | California (Laguna Niguel, Irvine, Lake Forest, Newport Beach, Corona Del Mar and southern Orange County) |
| 951 | California (western Riverside County, including Corona, Riverside, Temescal Canyon, Lake Elsinore, Mira Loma, Moreno Valley, Perris, Sun City, Murrieta, Temecula, Hemet, Winchester, Lakeview, Nuevo, Beaumont, Banning, Idyllwild; split from 909) Established 2004. |
| 952 | Minnesota (Bloomington, Minnetonka, Chaska and southwest Minneapolis area) |
| 954 | Florida (all of Broward County: Fort Lauderdale, Hollywood, Coral Springs, overlaid by 754) |
| 956 | Texas (Laredo, Brownsville, McAllen, Harlingen and South Texas) |
| 959 | Connecticut (Bristol, Hartford, Norwich and northern and eastern Connecticut, overlays with 860) |
| 970 | Colorado (Aspen, Durango, Grand Junction, Fort Collins and northern and western Colorado) |
| 971 | Oregon (Portland, Salem, Hillsboro, Beaverton and northwestern Oregon, overlays with 503) |
| 972 | Texas (Dallas area, overlays with 214 and 469) |
| 973 | New Jersey (Newark, Paterson and northwestern New Jersey, overlays with 862) |
| 975 | Missouri This area code is scheduled to provide numbering relief to code 816 but no date has been assigned for this to go into effect. |
| 978 | Massachusetts (Fitchburg, Peabody and northeastern Massachusetts, overlays with 351) |
| 979 | Texas (Wharton, Bryan, Bay City, College Station, Lake Jackson, La Grange and Southeast Texas) |
| 980 | North Carolina (Charlotte, Gastonia, Salisbury and south central North Carolina, overlays with 704) |
| 984 | North Carolina This area code is scheduled to provide overlay relief to code 919 but no date has been assigned for this to go into effect. |
| 985 | Louisiana (Houma, Slidell and southeastern Louisiana excluding New Orleans) |
| 989 | Michigan (Alpena, Mt. Pleasant, Bay City, Saginaw, Midland, Owosso and central Michigan) |
