Caller ID for
Area code 605
Area code 605 Sioux Falls, South Dakota
Area code 605 is one of the original 1947 area codes, in South Dakota, with numbers assigned in Sioux Falls, Rapid City, Aberdeen and 218 more places. It’s 11:12 PM there now.
- State
- South DakotaThe only area code in South Dakota
- Time zone
- Central and MountainSplit between 2 zones
- Exchanges
- 745221 places
- Overlay
- NoneThe only code for its area
- No sign-up
- We never contact the number
- Spam risk included
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Where area code 605 is
Numbers in 605 are assigned to 221 places in 65 counties: Minnehaha County, Lincoln County, Pennington County, Brown County, Beadle County, Brookings County, plus 59 more.
No single place dominates: Sioux Falls, the largest, has 12% of the exchanges.
- Sioux Falls92
- Rapid City50
- Aberdeen22
- Spearfish20
- Watertown17
- Pierre15
- Huron15
- Yankton14
- Mitchell13
- Brookings11
- Vermillion10
- North Sioux City10
- Sturgis9
- Flandreau9
- Madison8
- Redfield8
- Martin8
- Milbank8
- Belle Fourche7
- Lake Preston5
- Miller5
- Mobridge5
- Chamberlain5
- Sisseton5
Phone companies in 605
745 blocks of numbers in 605 are held by 89 phone companies. The most belong to Lumen (CenturyLink) (106), Verizon Wireless (100) and AT&T Mobility (81).
A mix: about 26% wireless, 43% local phone and cable and 32% other carriers, including internet phone services.
A block’s holder is the company it was first assigned to; numbers can move to other carriers since.
History and overlays
605 has been in service since 1947, when the first North American area codes were set up.
53 new exchanges were assigned since 2021, the latest in August 2026.
Calling 605
605 spans the Central and Mountain time zones: right now it’s 11:12 PM Central and 10:12 PM Mountain. Check which side of the line someone is on before calling early or late.
From elsewhere in the U.S., dial 1, 605 and the 7-digit number.
Nearby area codes
605 is South Dakota’s only area code.
- 712 · Sioux City, IA · about 213 mi
- 308 · Grand Island, NE · about 224 mi
- 531 · Omaha, NE · about 226 mi
- 701 · Fargo, ND · about 228 mi
- 402 · Omaha, NE · about 229 mi
- 320 · St. Cloud, MN · about 231 mi
From the North American Numbering Plan Administrator’s area code and exchange records (10/22/2026) and U.S. Census place and county names. Places and companies are where number blocks were assigned, not where anyone lives or which carrier a number uses today.
Map of the 605 area code
Map of the 605 area code around Sioux Falls, Rapid City and Aberdeen, South Dakota.
Cities on the map
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Questions about 605
Where is area code 605?
In South Dakota, covering Sioux Falls, Rapid City and Aberdeen and other places across 65 counties.
What time zone is 605 in?
Two: Central and Mountain. Right now it’s 11:12 PM Central and 10:12 PM Mountain.
Is 605 an overlay?
No. 605 is the only area code for its area right now.
Which phone companies have 605 numbers?
89 companies hold blocks; the most belong to Lumen (CenturyLink), Verizon Wireless and AT&T Mobility. About 26% of blocks are wireless.
Is 605 running out of numbers?
Not on record. 53 new exchanges have been assigned since 2021.