Union County ZIP Codes

List of ZIP Codes in Union County

The following table lists ZIP Codes associated with Union County, South Dakota, based on ZIP Code Tabulation Area (ZCTA) data from the U.S. Census Bureau.

About Union County ZIP Codes

Union County in South Dakota (SD) is served by approximately 4 ZIP Codes. These codes cover residential neighborhoods, business districts, and rural areas that fall under the county's jurisdiction.

Based on ZIP-level population estimates, the total population covered by these ZIP Codes is around 14,242 people. Population and density values vary from one ZIP Code to another, reflecting the mix of dense urban communities and lower-density suburban or rural zones.

Many of the most significant population centers in Union County are located in cities such as North Sioux City, Elk Point, Jefferson, Alcester. These cities and towns help define the economic and demographic character of the county.

Most ZIP Codes in Union County, South Dakota follow the America/Chicago time zone.