Area Code Overview

Area code 605 is a geographic telephone area code in South Dakota that went into service on January 1, 1947. The geographic regions covered by this area code overlay has a population of approximately 921,654.

Overlay and Dialing Rules

Area Code: 605
State: South Dakota
Type: General Purpose Code
In Service Date: January 1, 1947
Overlay Complex: 605
Local Dialing Plan: This area does require you to dial the area code when calling locally.

Estimated Number of Assigned Phone Numbers in Area Code 605

This area code is ranked 133rd out of 363 nationwide in estimated assigned phone numbers. Within the state territory it serves, it is ranked 1st out of 1.

5,830,000

Estimated Service-Type Mix of Assigned Phone Numbers in Area Code 605

Total assigned 5,830,000

Wireless

1,311,000 assigned

22.49%

Wireline and VoIP

2,537,000 assigned

43.52%

Other / Unclassified

1,982,000 assigned

34.00%

Estimated Share of Wireless Numbers Originally Assigned to Each Carrier in Area Code 605

Estimated assigned wireless phone numbers: 1,311,000

Numbers may later be ported to another carrier, but this chart reflects original number assignment, not current subscriber share.

Verizon Wireless 694,000 (52.94%)

AT&T Wireless 429,000 (32.72%)

AERIAL COMMUNICATIONS, INC. 140,000 (10.68%)

T-Mobile 29,000 (2.21%)

JAMES VALLEY WIRELESS, LLC 10,000 (0.76%)

NATIVE WIRELESS, LLC 7,000 (0.53%)

Optimum Mobile 1,000 (0.08%)

RINGER MOBILE, INC. 1,000 (0.08%)

Estimated Share of Wireline and VoIP Numbers Originally Assigned to Each Carrier in Area Code 605

Estimated assigned wireline and VoIP phone numbers: 2,537,000

Lumen 616,000 (24.28%)

Onvoy 475,000 (18.72%)

CLARITY TELECOM, LLC DBA BLUEPEAK 320,000 (12.61%)

INTERSTATE TELECOM COOP, INC. - SD 250,000 (9.85%)

Bandwidth 147,000 (5.79%)

JAMES VALLEY COOPERATIVE TELEPHONE COMPANY 130,000 (5.12%)

VALLEY TELECOM COOP. ASSN., INC. 90,000 (3.55%)

WEST RIVER COOPERATIVE TELEPHONE COMPANY 80,000 (3.15%)

TERRA NOVA TELECOM INC. 72,000 (2.84%)

Spectrum 53,000 (2.09%)

Airus 48,000 (1.89%)

Telnyx 48,000 (1.89%)

Other / Unclassified Assigned Numbering in Area Code 605

Estimated assigned other or unclassified phone numbers: 1,982,000

VENTURE COMMUNICATIONS COOPERATIVE 290,000 (14.63%)

MIDCONTINENT COMMUNICATIONS. - SD 284,000 (14.33%)

GOLDEN WEST TEL COOP INC DBA GOLDEN WEST TELECOMM 270,000 (13.62%)

VIVIAN TEL CO DBA GOLDEN WEST TELECOMMUNICATIONS 190,000 (9.59%)

MIDSTATE COMMUNICATIONS, INC. 100,000 (5.05%)

SANTEL COMMUNICATIONS COOPERATIVE, INC. - SD 100,000 (5.05%)

FORT RANDALL TELCO DBA MT RUSHMORE TELEPHONE CO 80,000 (4.04%)

TRIOTEL COMMUNICATIONS, INC. 80,000 (4.04%)

RC TECHNOLOGIES 60,000 (3.03%)

CHEYENNE RIVER SIOUX TRIBAL TEL. AUTHORITY 50,000 (2.52%)

SIOUX VALLEY TEL DBA GOLDEN WEST TELECOMMUNICATION 50,000 (2.52%)

ALLIANCE COMM. COOPERATIVE, INC. (SPLIT ROCK) 40,000 (2.02%)

Cities and Towns in Area Code 605

Aberdeen, South Dakota Academy, South Dakota Alcester, South Dakota Alexandria, South Dakota Alpena, South Dakota Alsen, South Dakota Andover, South Dakota Ardmore, South Dakota Arlington, South Dakota Armour, South Dakota Artesian, South Dakota Astoria, South Dakota Avon, South Dakota Baltic, South Dakota Belle Fourche, South Dakota Belvidere, South Dakota Beresford, South Dakota Big Stone City, South Dakota Bison, South Dakota Blunt, South Dakota Bonesteel, South Dakota Bowdle, South Dakota Bradley, South Dakota Brandon, South Dakota Brandt, South Dakota Bridgewater, South Dakota Bristol, South Dakota Britton, South Dakota Brookings, South Dakota Buffalo Gap, South Dakota Buffalo, South Dakota Burke, South Dakota Camp Crook, South Dakota Canistota, South Dakota Canova, South Dakota Canton, South Dakota Castlewood, South Dakota Cavour, South Dakota Centerville, South Dakota Chamberlain, South Dakota Chester, South Dakota Claire City, South Dakota Claremont, South Dakota Clark, South Dakota Clayton, South Dakota Clear Lake, South Dakota Clearfield, South Dakota Colton, South Dakota Columbia, South Dakota Conde, South Dakota Corsica, South Dakota Creighton, South Dakota Cresbard, South Dakota Crooks, South Dakota Custer, South Dakota De Smet, South Dakota Dell Rapids, South Dakota Delmont, South Dakota Doland, South Dakota Dupree, South Dakota Eagle Butte, South Dakota Edgemont, South Dakota Elk Point, South Dakota Elkton, South Dakota Emery, South Dakota Enning, South Dakota Estelline, South Dakota Ethan, South Dakota Eureka, South Dakota Faith, South Dakota Faulkton, South Dakota Ferney, South Dakota Flandreau, South Dakota Florence, South Dakota Forestburg, South Dakota Fort Thompson, South Dakota Frederick, South Dakota Freeman, South Dakota Gann Valley, South Dakota Garretson, South Dakota Gary, South Dakota Gettysburg, South Dakota Glenham, South Dakota Goodwin, South Dakota Gregory, South Dakota Groton, South Dakota Harrisburg, South Dakota Harrold, South Dakota Hartford, South Dakota Hayes, South Dakota Hayti, South Dakota Hecla, South Dakota Hermosa, South Dakota Herreid, South Dakota Highmore, South Dakota Hill City, South Dakota Hitchcock, South Dakota Hosmer, South Dakota Hot Springs, South Dakota Houghton, South Dakota Hoven, South Dakota Howard, South Dakota Hudson, South Dakota Humboldt, South Dakota Hurley, South Dakota Huron, South Dakota Interior, South Dakota Ipswich, South Dakota Irene, South Dakota Iroquois, South Dakota Isabel, South Dakota Jefferson, South Dakota Kadoka, South Dakota Kennebec, South Dakota Keystone, South Dakota Kimball, South Dakota Kyle, South Dakota La Plant, South Dakota Lake Andes, South Dakota Lake Norden, South Dakota Lake Preston, South Dakota Langford, South Dakota Lebanon, South Dakota Lemmon, South Dakota Lennox, South Dakota Leola, South Dakota Lesterville, South Dakota Letcher, South Dakota Long Lake, South Dakota Long Valley, South Dakota Madison, South Dakota Marion, South Dakota Martin, South Dakota Maurine, South Dakota Mc Intosh, South Dakota Mc Laughlin, South Dakota Meadow, South Dakota Mellette, South Dakota Menno, South Dakota Midland, South Dakota Milbank, South Dakota Milesville, South Dakota Miller, South Dakota Mission, South Dakota Mitchell, South Dakota Mobridge, South Dakota Mound City, South Dakota Mount Vernon, South Dakota Murdo, South Dakota New Effington, South Dakota New Holland, South Dakota New Underwood, South Dakota Newell, South Dakota Nisland, South Dakota North Sioux City, South Dakota Nunda, South Dakota Oelrichs, South Dakota Oldham, South Dakota Onaka, South Dakota Onida, South Dakota Oral, South Dakota Orient, South Dakota Parker, South Dakota Parkston, South Dakota Peever, South Dakota Philip, South Dakota Pierpont, South Dakota Pierre, South Dakota Pine Ridge, South Dakota Plankinton, South Dakota Platte, South Dakota Pollock, South Dakota Presho, South Dakota Pukwana, South Dakota Quinn, South Dakota Rapid City, South Dakota Redfield, South Dakota Ree Heights, South Dakota Reliance, South Dakota Revillo, South Dakota Roscoe, South Dakota Rosebud, South Dakota Rosholt, South Dakota Roslyn, South Dakota Salem, South Dakota Scotland, South Dakota Selby, South Dakota Seneca, South Dakota Sinai, South Dakota Sioux Falls, South Dakota Sisseton, South Dakota Sorum, South Dakota South Shore, South Dakota Spearfish, South Dakota Spencer, South Dakota Springfield, South Dakota Stickney, South Dakota Stockholm, South Dakota Sturgis, South Dakota Summit, South Dakota Tabor, South Dakota Timber Lake, South Dakota Tolstoy, South Dakota Toronto, South Dakota Tripp, South Dakota Tulare, South Dakota Turton, South Dakota Tyndall, South Dakota Valley Springs, South Dakota Veblen, South Dakota Vermillion, South Dakota Viborg, South Dakota Vivian, South Dakota Volga, South Dakota Wagner, South Dakota Wakonda, South Dakota Wall, South Dakota Wasta, South Dakota Watertown, South Dakota Waubay, South Dakota Webster, South Dakota Wentworth, South Dakota Wessington, South Dakota White Lake, South Dakota White River, South Dakota White, South Dakota Wicksville, South Dakota Wilmot, South Dakota Winfred, South Dakota Winner, South Dakota Witten, South Dakota Wolsey, South Dakota Wood, South Dakota Woonsocket, South Dakota Worthing, South Dakota Yankton, South Dakota

How These Figures Were Built

These figures are estimates based on public phone-number assignment records. They are meant to show the likely mix of assigned phone numbers associated with area code 605, not live customer counts.

Some providers may have assigned phone numbers tied to this area code even if they do not actively market or sell service locally. These figures reflect public number-assignment records, not confirmed local service availability.

They also do not reflect number portability at the individual phone-number level, so some numbers may now be used on a different network or by a different provider than the original assignment records suggest.

Population data and locality matching provided by GeoNames.

Last refreshed: April 15, 2026 6:22 pm