Home values, rents and more in Union County, SD
September 2026 figures from Zillow and the U.S. Census Bureau · updated 2026-11-07
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- $190k–$230k
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- $290k+
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How Union County, SD compares
The typical home in Union County, SD is worth about $356,000, according to the Zillow Home Value Index for September 2026. Home values in Union County, SD are 1.6 times the typical value in the Sioux City metro area ($224,000) and about the same as the U.S. typical value ($366,000).
Over the past year, home values in Union County, SD rose 2.7%, compared with +3.4% in the Sioux City metro area and +1.2% nationally.
Typical rent is $1,310 a month (Zillow Observed Rent Index), about the same as the Sioux City metro area ($1,295) and 32% below the U.S. ($1,932).
The median household income is $89,636, against $75,192 in the Sioux City metro area and $80,734 in the U.S. (Census Bureau, American Community Survey 2020–24).
About 17,402 people live in Union County, SD (Census Bureau estimate for July 2025).
Union County, SD has the highest typical home value of the 3 counties in the Sioux City metro area and the 7th-highest of 50 in South Dakota with Zillow figures.
Part of: Sioux City metro area · South Dakota
More for Union County, SD in ProMap Plus
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- 5- and 10-year price changes
- Days on market and months of supply
- Price cuts and sale-to-list ratio
- Price-to-income and monthly cost to buy
- School test scores
- Flood, wildfire and natural hazard risk
- Property-tax rate
- Unemployment and job growth
- Building permits
- Mortgage delinquency
- 2024 presidential vote
- Age, education and household make-up
- Amenities and transit nearby
Nearby counties
Cities in Union County, SD
ZIP codes in Union County, SD
Sources
Home values: Zillow Home Value Index (ZHVI), all homes, middle tier, smoothed and seasonally adjusted, September 2026. Rents: Zillow Observed Rent Index (ZORI), seasonally adjusted. Population: Census population estimates (July 2025) for states, metros and counties; ACS 2020–24 for cities and ZIP codes. Income: U.S. Census Bureau, ACS 2020–24 5-year estimates. Boundaries: U.S. Census Bureau cartographic boundary files. Compiled by Home Economics.
"Typical" is Zillow's middle-tier value (homes between the 35th and 65th percentiles), not a median sale price. Changes are over the 12 months to September 2026.