Area Code 605

South Dakota

Area code 605 serves South Dakota, primarily Sioux Falls, in the Central Time (CT) time zone. It has served the region since 01-Jan-1947.

Published:

Demographics & Economics

Total Population
1,550,889
Population Density
7 people/sq mi
below U.S. average (U.S.: 93 people/sq mi)
Median Household Income
$73,855
near U.S. median (U.S.: $75,144)
Poverty Rate
11.9%
near U.S. average (U.S.: 11.5%)
Unemployment Rate
3.4%
near U.S. average (U.S.: 3.6%)
Education Attainment
Bachelor's Degree+
29.5%
below U.S. average (U.S.: 33.7%)
High School or Lower
33.1%

Statistics are population-weighted aggregations from Census ACS 5-year estimates. Population figures are approximate — see Sources & Methodology for details on how area code populations are derived.

See how this area code compares to all US area codes in the income ranking and density ranking.

Time Zones

  • Central Time (CT)
  • Mountain Time (MT)

NANPA Relief Status

According to the latest NANPA analysis (July 2026), this area code is not currently listed as exhausting within the next 36 months. No relief planning is in progress for this NPA.

Source: NANPA NPA Relief Planning Reports · See all relief planning statuses

Current Time

Central Time (CT)
 
 
Mountain Time (MT)
 
 

This area code spans multiple time zones.

Prefix Utilization

Geographic Coverage

State

SD

Major Cities

  • Sioux Falls
  • Rapid City
  • Aberdeen
  • Brookings
  • Watertown
  • Mitchell
  • Yankton
  • Huron
  • Pierre
  • Spearfish
  • Box Elder
  • Vermillion
  • Brandon
  • Harrisburg
  • Rapid Valley
  • Sturgis
  • Tea
  • Madison
  • Belle Fourche
  • Dakota Dunes
  • Dell Rapids
  • Milbank
  • Hot Springs
  • Hartford

and 461 more cities

Area Code 605 geographic coverage map (light mode)

History

Area code 605 is one of the original area codes established in 1947 when the North American Numbering Plan (NANP) was created.

Demographics

The estimated population served by area code 605 is approximately 1,550,889. The population density is 7 people per square mile, which is lower than the national average of 93. The median household income is $73,855, which is near the national median of $75,144. Approximately 29.5% of adults hold a bachelor's degree or higher, compared to the national rate of 33.7%. This rate is lower than the national average. The poverty rate stands at 11.9%, which is near the national rate of 11.5%.

County Coverage

Population-weighted county share based on aggregated ZCTA population (100% = total mapped population for area code 605).

CountyPopulationShare
Minnehaha, SD244,55015.8%
Pennington, SD136,3628.8%
Meade, SD123,9718.0%
Lincoln, SD119,6227.7%
Lawrence, SD45,1332.9%
Moody, SD42,7812.8%
Brown, SD41,6512.7%
Brookings, SD38,6332.5%
Hamlin, SD37,5592.4%
Butte, SD30,3152.0%
Codington, SD29,7651.9%
Yankton, SD27,1981.8%
Lake, SD26,8451.7%
Turner, SD26,3541.7%
Hanson, SD23,1951.5%
Davison, SD22,4181.4%
Beadle, SD22,3431.4%
Clay, SD21,8021.4%
Sully, SD21,1911.4%
Sanborn, SD20,4241.3%
McCook, SD20,1781.3%
Union, SD19,4751.3%
Hughes, SD18,2081.2%
Roberts, SD18,0671.2%
Custer, SD17,1941.1%
Oglala Lakota, SD16,0531.0%
Hutchinson, SD15,3171.0%
Todd, SD12,7640.8%
Charles Mix, SD12,0210.8%
Dewey, SD11,4540.7%
Harding, SD11,0820.7%
Corson, SD10,8770.7%
Aurora, SD10,4270.7%
Clark, SD9,9080.6%
Grant, SD9,8510.6%
Jackson, SD9,6560.6%
Marshall, SD9,5160.6%
Brule, SD8,9310.6%
Carter, MT8,9020.6%
Buffalo, SD8,7610.6%
Crook, WY8,7110.6%
Douglas, SD8,5560.6%
Mellette, SD8,4050.5%
Lyman, SD8,3660.5%
Fall River, SD8,3080.5%
Bon Homme, SD8,2680.5%
Spink, SD8,1170.5%
Tripp, SD7,9260.5%
Day, SD7,7390.5%
Bennett, SD7,6980.5%
Deuel, SD7,6840.5%
Kingsbury, SD7,5090.5%
Hand, SD6,9880.5%
Ziebach, SD6,9260.4%
Walworth, SD6,4950.4%
Faulk, SD6,4390.4%
Edmunds, SD5,9990.4%
Miner, SD5,3520.3%
Jerauld, SD4,5850.3%
Sioux, ND4,4240.3%
Rock, MN4,3160.3%
Campbell, SD4,3060.3%
Perkins, SD4,2130.3%
Gregory, SD4,0560.3%
Stanley, SD3,5570.2%
McPherson, SD3,2650.2%
Potter, SD3,1090.2%
Hyde, SD2,3740.2%
Grant, ND2,3560.2%
Haakon, SD2,1770.1%
Adams, ND1,9630.1%
Sargent, ND1,9160.1%
Sioux, NE1,7150.1%
Jones, SD1,6010.1%
Lincoln, MN1,4910.1%
Pipestone, MN1,4910.1%
Sioux, IA7200.0%
Richland, ND5380.0%
Emmons, ND4760.0%

Area Code 605 Family Tree

Area code 605 is an original area code with no splits or overlays. It has been in service since 01-Jan-1947.

Call Context

Rural geographic area

This area code covers a primarily rural region in SD with low population density. The largest community is Sioux Falls.

Nearby Area Codes

Area codes geographically closest to 605.

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Area code 531 map card showing Omaha (light mode)
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Area code 701 map card showing Fargo (light mode)
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