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Area code 605 calling hours: can you call now?

Area code 605 serves Sioux Falls, Rapid City, and Aberdeen in South Dakota. It spans Central and Mountain time, so the exchange matters. Clocks move for daylight saving time in March and November.

Live check: area code 605

Turn on JavaScript for the live check. The rules table below lists every window that applies to 605.

Not checked here: consent, Do-Not-Call lists, Reg F call frequency (7 calls in 7 days), cease-communication requests or attorney representation, reassigned numbers, and whether the consumer has told you a time is inconvenient.

Calling-hour rules for 605

Hours are local time at the person you are calling. When federal and South Dakota rules differ, the narrower window governs; the live check applies every row at once.

Rule setDebt collectionTelemarketing
Federal

Presumed convenient 8 a.m.-9 p.m. local time at the consumer's location, any day.

Every day 8:00 a.m.–9:00 p.m.

15 U.S.C. § 1692c(a)(1) · 12 CFR § 1006.6(b)(1)(i) (Regulation F) · Reg F Official Interpretation, comment 6(b)(1)(i)-2 (consumer's location) · 12 CFR § 1006.14(b)(2)

  • Call-frequency presumption: a collector is presumed to comply with the harassment ban if it places no more than 7 calls to a person about a particular debt within 7 consecutive days, and no call within 7 days after a telephone conversation with that person about the debt; exceeding either is presumed a violation (12 CFR § 1006.14(b)(2)).
  • Conflicting location information: if the collector's information indicates the consumer may be in more than one place (e.g. an Eastern-zone area code and a Pacific-zone address), it complies only by calling at a time convenient in all of those locations (Reg F comment 6(b)(1)(i)-2).
  • A collector may not call at any time it knows or should know is inconvenient to the consumer (e.g. after the consumer says so), regardless of the 8 a.m.-9 p.m. default (15 U.S.C. § 1692c(a)(1); Reg F comment 6(b)(1)-1).

No federal Sunday or holiday ban, but a consumer's statement that a day or time is inconvenient makes calls then unlawful. The 8-9 window is a default presumption that the consumer's prior consent (given directly to the collector) or a court can override.

8 a.m.-9 p.m. local time at the called party's location, any day.

Every day 8:00 a.m.–9:00 p.m.

47 CFR § 64.1200(c)(1) (TCPA rules) · 16 CFR § 310.4(c) (Telemarketing Sales Rule)

  • No telephone solicitation to a number on the National Do Not Call Registry absent an established business relationship or the consumer's signed written permission (47 CFR § 64.1200(c)(2); 16 CFR § 310.4(b)(1)(iii)(B)).
  • Autodialed or artificial/prerecorded-voice telemarketing calls to wireless numbers, and prerecorded telemarketing calls to residential lines, require the called party's prior express written consent (47 CFR § 64.1200(a)(2)-(3)).
  • Sellers must honor company-specific do-not-call requests (47 CFR § 64.1200(d); 16 CFR § 310.4(b)(1)(iii)(A)).

TSR § 310.4(c) allows calls outside 8-9 with the person's prior consent; the TCPA time rule in § 64.1200(c)(1) has no consent exception for telephone solicitations as defined.

South DakotaNo separate state hours; the federal window applies.

9 a.m.–9 p.m. consumer's local time Monday–Saturday; no unsolicited telemarketing on Sundays.

Mon–Sat 9:00 a.m.–9:00 p.m.; Sun no calls

SDCL § 37-30A-3(2) · SDCL § 37-30-28 (automated dialing systems)

  • Telemarketers may not harass, intimidate or torment, or send misleading caller ID (SDCL § 37-30A-3(3)–(4)).

Autodialed (ATDS) telephone solicitations are further limited to weekdays 9 a.m.–9 p.m. 'according to the time in this state' (SDCL § 37-30-28, Class 2 misdemeanor) — i.e., no autodialed solicitations on Saturdays; not modeled because this entry covers all calls.

Autodialed/prerecorded: Autodialed solicitations only on weekdays, 9 a.m.–9 p.m. South Dakota time.

Mon–Fri 9:00 a.m.–9:00 p.m.; Sat–Sun no calls

SDCL § 37-30-28 (automated dialing systems)

Also in South Dakota

  • No South Dakota statute setting debt-collection calling hours was found; federal FDCPA/Reg F applies.

Exchanges and time zones

Area code 605 spans Central and Mountain time. The exchange — the three digits after the area code — maps to a rate center, and the rate center sets the zone. Enter the number in the check above to use it; without one, the check requires the window to be open in every zone 605 covers.

Central time America/Chicago · 577 exchanges

Rate centerCountyExchanges
Sioux Falls, SDMinnehaha92
Aberdeen, SDBrown22
Watertown, SDCodington17
Huron, SDBeadle15
Pierre, SDHughes15
Yankton, SDYankton14
Mitchell, SDDavison13
Brookings, SDBrookings11
Harrisburg Tea, SDLincoln11
North Sioux City, SDUnion10
Vermillion, SDClay10
Flandreau, SDMoody9
Madison, SDLake8
Milbank, SDGrant8
Redfield, SDSpink8
Canton, SDLincoln5
Chamberlain, SDBrule5
Lake Preston, SDKingsbury5
Miller, SDHand5
Mobridge, SDWalworth5
Sisseton, SDRoberts5
Beresford, SDUnion4
Big Stone City, SDGrant4
Elk Point, SDUnion4
Fort Thompson, SDBuffalo4
Highmore, SDHyde4
Lake Andes, SDCharles Mix4
Platte, SDCharles Mix4
Salem, SDMcCook4
Webster, SDDay4
Winner, SDTripp4
Arlington, SDKingsbury3
Bowdle, SDEdmunds3
Brandon, SDMinnehaha3
Britton, SDMarshall3
Castlewood, SDHamlin3
Clark, SDClark3
De Smet, SDKingsbury3
Gettysburg, SDPotter3
Glenham, SDWalworth3
Gregory, SDGregory3
Howard, SDMiner3
Iroquois, SDKingsbury3
Kimball, SDBrule3
Lennox, SDLincoln3
Mission, SDTodd3
North Valentine, SDTodd3
Onida, SDSully3
Volga, SDBrookings3
Armour, SDDouglas2
Baltic, SDMinnehaha2
Brookings Rural, SDBrookings2
Bryant Willow Lake, SD—2
Cavour, SDBeadle2
Centerville, SDTurner2
Colton, SDMinnehaha2
Crooks, SDMinnehaha2
Dell Rapids, SDMinnehaha2
Elkton, SDBrookings2
Estelline, SDHamlin2
Hartford, SDMinnehaha2
Hayti, SDHamlin2
Ipswich, SDEdmunds2
Lake Norden, SDHamlin2
Murdo, SDJones2
Parkston, SDHutchinson2
Roscoe, SDEdmunds2
Roslyn, SDDay2
Selby, SDWalworth2
Tyndall, SDBon Homme2
Viborg, SDTurner2
Wakonda, SDClay2
Waubay, SDDay2
West Jasper, SDHanson2
White, SDBrookings2
Wolsey, SDBeadle2
Worthing, SDLincoln2
Academy, SDCharles Mix1
Alcester, SDUnion1
Alexandria, SDHanson1
Alpena, SDJerauld1
Alsen, SDUnion1
Andover, SDDay1
Artesian, SDSanborn1
Astoria, SDDeuel1
Avon, SDBon Homme1
Blunt, SDHughes1
Bonesteel, SDGregory1
Bradley, SDClark1
Brandt, SDDeuel1
Bridgewater, SDMcCook1
Bristol, SDDay1
Burke, SDGregory1
Canistota, SDMcCook1
Canova, SDMiner1
Center, SDAurora1
Chester, SDLake1
Claire City, SDRoberts1
Claremont, SDBrown1
Clayton, SDHutchinson1
Clear Lake, SD—1
Clearfield, SDTripp1
Columbia, SDBrown1
Conde, SDSpink1
Corsica, SDDouglas1
Cresbard, SDFaulk1
Delmont, SDDouglas1
Doland, SDSpink1
Emery, SDHanson1
Ethan, SDDavison1
Eureka, SDMcPherson1
Faulkton, SDFaulk1
Ferney, SDBrown1
Florence, SDCodington1
Forestburg, SDSanborn1
Frederick, SDBrown1
Freeman, SDHutchinson1
Gann Valley, SDBuffalo1
Garretson, SDMinnehaha1
Gary, SDDeuel1
Goodwin, SDDeuel1
Groton, SDBrown1
Harrold, SDHughes1
Hecla, SDBrown1
Herreid, SDCampbell1
Hitchcock, SDBeadle1
Hosmer, SDEdmunds1
Houghton, SDBrown1
Hoven, SDPotter1
Hudson, SDLincoln1
Humboldt, SDMinnehaha1
Hurley, SDTurner1
Irene, SDTurner1
Jefferson, SDUnion1
Kennebec, SDLyman1
Langford, SDMarshall1
Lebanon, SDPotter1
Leola, SDMcPherson1
Lesterville, SDYankton1
Letcher, SDSanborn1
Long Lake, SDMcPherson1
Marion, SDTurner1
Mellette, SDSpink1
Menno, SDHutchinson1
Mound City, SDCampbell1
Mount Vernon, SDDavison1
New Effington, SDRoberts1
New Holland, SDDouglas1
North Bristow, SDCharles Mix1
North Cody, SDMellette1
North Crookston, SDTodd1
North Kilgore, SDTodd1
North Larchwood, SDMinnehaha1
North Naper, SDGregory1
Nunda, SDLake1
Oldham Ramona, SDKingsbury1
Onaka, SDFaulk1
Orient, SDFaulk1
Parker, SDTurner1
Peever, SDRoberts1
Pierpont, SDDay1
Plankinton, SDAurora1
Pollock, SDCampbell1
Presho, SDLyman1
Pukwana, SDBrule1
Ree Heights, SDHand1
Reliance, SDLyman1
Revillo, SDGrant1
Rosebud, SDTodd1
Rosholt, SDRoberts1
Scotland, SDBon Homme1
Seneca, SDFaulk1
Sinai, SDBrookings1
South Ashley, SDMcPherson1
South Ellendale, SDBrown1
South Forbes, SDCharles Mix1
South Forman, SDMarshall1
South Guelph, SD—1
South Lidgerwood, SDRoberts1
South Shore, SDCodington1
South Venturia, SDMcPherson1
Spencer, SDMcCook1
Springfield, SDBon Homme1
Stickney, SDAurora1
Stockholm, SDGrant1
Summit, SDRoberts1
Tabor, SDBon Homme1
Tolstoy, SDPotter1
Toronto, SDDeuel1
Tripp, SDHutchinson1
Tulare, SDSpink1
Turton, SDSpink1
Valley Springs, SDMinnehaha1
Veblen, SDMarshall1
Vivian, SDLyman1
Wagner, SDCharles Mix1
Wall Lake, SDMinnehaha1
Wentworth, SDLake1
Wessington, SDBeadle1
Wessington Springs, SDJerauld1
West Akron, SD—1
West Browns Valley, SDRoberts1
West Hawarden, SDUnion1
West Hendricks, SDBrookings1
White Lake, SDAurora1
White River, SDMellette1
Wilmot, SDRoberts1
Winfred, SDLake1
Witten, SDTripp1
Wood, SDMellette1
Woonsocket, SDSanborn1

Mountain time America/Denver · 163 exchanges

Rate centerCountyExchanges
Rapid City, SDPennington50
Spearfish, SDLawrence20
Sturgis, SDMeade9
Martin, SDBennett8
Belle Fourche, SDButte7
Dupree, SDZiebach4
Custer, SDCuster3
Hill City, SDPennington3
Hot Springs, SDFall River3
McIntosh, SDCorson3
Pine Ridge, SDOglala Lakota3
Eagle Butte, SDDewey2
Faith, SDMeade2
Kadoka, SDJackson2
Kyle, SDOglala Lakota2
New Underwood, SDPennington2
Wall, SDPennington2
Ardmore, SDFall River1
Belvidere, SDJackson1
Bison, SDPerkins1
Buffalo, SDHarding1
Buffalo Gap, SDCuster1
Camp Crook, SDHarding1
Creighton, SDPennington1
East Newcastle, SD—1
Edgemont, SDFall River1
Enning, SDMeade1
Hermosa, SDCuster1
Interior, SDJackson1
Isabel, SDDewey1
Keystone, SDPennington1
La Plant, SDDewey1
Lemmon, SDPerkins1
Long Valley, SDJackson1
Maurine, SDMeade1
McLaughlin, SDCorson1
Meadow, SDPerkins1
Midland, SDHaakon1
Milesville, SDHaakon1
Newell, SDButte1
Nisland, SDButte1
North Gordon, SDOglala Lakota1
Oelrichs, SDFall River1
Oral, SDFall River1
Philip, SDHaakon1
Quinn, SDPennington1
Sorum, SDPerkins1
South Hettinger, SDPerkins1
South Ladd, SDHarding1
South Reeder, SDHarding1
South Scranton, SDHarding1
Timber Lake, SDDewey1
Wasta, SDPennington1
West Marietta, SDFall River1
Wicksville, SDPennington1

Zone not resolved

We could not pin these exchanges to one time zone; the check requires the window to be open in every zone 605 covers.

Rate centerCountyExchanges
Flyger, SD—1
Hayes, SDStanley1
South Nelvik, SD—1

Related area codes

605 has no overlay codes.

Why area code alone is not enough

Questions

What time can you call area code 605?

Area code 605 is in South Dakota, on Central and Mountain time. Debt collection: federal — Presumed convenient 8 a.m.-9 p.m. local time at the consumer's location, any day. South Dakota: no separate hour rule. Telemarketing: federal — 8 a.m.-9 p.m. local time at the called party's location, any day. South Dakota: 9 a.m.–9 p.m. consumer's local time Monday–Saturday; no unsolicited telemarketing on Sundays. Autodialed or prerecorded calls: Autodialed solicitations only on weekdays, 9 a.m.–9 p.m. South Dakota time.

What time zone is area code 605?

Area code 605 spans Central and Mountain time. The exchange (the three digits after the area code) decides which; when it is unknown, a call should fit the window in every zone the area code covers.

Can a debt collector call a 605 number on Sunday?

Neither federal law nor South Dakota sets separate Sunday hours for debt collection; the 8 a.m.–9 p.m. local-time window applies, and a consumer can tell a collector that Sunday is inconvenient.

Is the 605 area code enough to know the person's local time?

No. Mobile numbers move with their owners and ported numbers keep their area code, so a 605 number may belong to someone in another time zone. If you know other locations for the person, the call should fit the window in all of them.

Sources

Exchange and rate-center data: NANPA CO Code Assignments (utilized, all states) (retrieved 2026-10-07); NANPA NPA listing (area code information) (retrieved 2026-10-07); NANPA rate centers by state (retrieved 2026-10-07); U.S. Census Bureau 2024 Gazetteer (places) (retrieved 2026-10-07); U.S. Census Bureau 2024 Gazetteer (county subdivisions) (retrieved 2026-10-07); U.S. Census Bureau 2024 cartographic boundary file (counties, 1:500k) (retrieved 2026-10-07); USGS GNIS Domestic Names (split-zone states only) (retrieved 2026-10-07); 49 CFR Part 71 - Standard Time Zone Boundaries (retrieved 2026-10-07). Statutes and regulations: 15 U.S.C. § 1692c(a)(1), 12 CFR § 1006.6(b)(1)(i) (Regulation F), Reg F Official Interpretation, comment 6(b)(1)(i)-2 (consumer's location), 12 CFR § 1006.14(b)(2), 47 CFR § 64.1200(c)(1) (TCPA rules), 16 CFR § 310.4(c) (Telemarketing Sales Rule), and the state citations in the rules table.

This page is general information, not legal advice. Laws change and some rules depend on who is calling and why; confirm with counsel. Rules last reviewed 2026-10-07.

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