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  3. Area code 605
South Dakota (SD)Central Time (CT), Mountain Time (MT)

Area Code 605

South Dakota (SD) * Sioux Falls, Rapid City, Brookings, Spearfish, Aberdeen, Agar, Akaska, Alcester * Central Time (CT), Mountain Time (MT)

906.1K

Population

374

ZIP codes

South Dakota

Primary state

Central Time (CT), Mountain Time (MT)

Time zones

What stands out

  • Coverage: 906.1K people across 374 ZIP codes.
  • Major cities: Sioux Falls, Rapid City, Brookings.
Primary state:South Dakota (SD)/Major cities:Sioux Falls, Rapid City, Brookings, Spearfish, Aberdeen, Agar, Akaska, Alcester

Browse sections

Basics

Percentiles compare this area code to other area codes nationwide.

Population

906.1K

ZIP codes

374

Median age

38.6 yrs

Population density

11.9/sq mi

Mean commute time

18 min

Avg. household size

2.5

Neighbors

Neighboring area codes

218307308320402406507531701712
Notes & Sources
  • Area-code boundaries can change over time; verify official assignments with NANPA for critical use.
  • This page aggregates ZIP-based crosswalks for orientation and does not indicate phone-number availability.

Data freshness

ACS 5-year
2020–2024
Page updated
2026-02-23

Release schedule and upstream dates: Sources.

Data sources

U.S. Census (ACS 5-year)U.S. Census TIGER/LineNANPA

Derived statistics

  • Area codes are not Census geographies; statistics are estimated by aggregating ZCTA (ZIP) values for associated ZIPs.
  • ZIP↔area code associations are derived from NPA boundary polygons and ZCTA centroid points, and can be approximate.
  • Median age, mean commute, and household size are population-weighted; population density uses summed ZIP land area.
Area code overlays and service areas are primarily governed by NANPA; this page uses aggregated geographic overlays for orientation only.

Data accuracy & methodology

This report aggregates 2020–2024 ACS 5-year estimates and geographic overlays for orientation. Area code service areas can cross ZIP/state boundaries and change over time; verify official assignments with NANPA for critical use.