Union County, South Dakota ZIP Codes

ZIP records
4
Cities represented
4
Sum of listed ZIP population estimates
14,418

Population sum includes positive estimates in these ZIP records; it is not an official county population.

Top ZIP Codes by Population

Rank	ZIP Code	City	Population estimate
1	57049	North Sioux City	7,962
2	57025	Elk Point	3,120
3	57038	Jefferson	1,796
4	57001	Alcester	1,540

Cities in Union County

Alcester
Elk Point
Jefferson
North Sioux City

ZIP Directory

ZIP 57001
ZIP 57025
ZIP 57038
ZIP 57049

Browse all ZIP data for South Dakota

Methodology: Records are grouped by the source file's listed county and state. Population sums add positive ZIP-level estimates and are not official county totals; city counts use distinct city labels in the source.