Counties / South Dakota / Union County

Union County, SD

FIPS 46127 · population 17,081 · part of Sioux City, IA

$364k
Zillow home value · 2026-06
The numbers

What this county costs and earns

Everything here joins on the county FIPS code, so each figure comes from the agency that publishes it with no name matching in between.

Zillow home value
$364k
▲ 4.0% year over year
Zillow ZHVI · direct
Median asking rent
$1,579
n/a year over year
Zillow ZORI · direct
Gross yield
5.2%
annual rent ÷ price, before costs
derived: rent × 12 ÷ price ✓
HUD 2-bed standard
$1,154
market rent is 1.37x the standard
HUD Fair Market Rent · direct
Independent price check

Do two methods point the same way?

Zillow estimates a current home value. FHFA tracks repeat mortgage transactions. Their growth rates should be read side by side, not averaged.

Both annual signals move in the same direction
FHFA five-year cumulative+51.1%not annualized · through 2025
0%ZILLOW ZHVI2026-06+4.0%FHFA HPI2025+10.0%
Annual changes use different methods and may use different periods. The comparison checks direction and magnitude; it does not create a blended estimate. Zillow county ZHVI pulled 2026-07-26; FHFA annual county HPI pulled 2026-07-28.
Owner-reported value$301k
Surveyed gross rent$1,069
Rent burden 30%+38.7%
Median year built1993
Housing composition

Who occupies the stock—and what it is

ACS 2024 5-year
3.7%vacant
7,588estimated housing units
Occupied tenure26.9% renter
owner 73.1%renter 26.9%
Structure mix74.8% single-family
Single-family 74.8%20+ units 8.9%Mobile home 4.2%Other 12.1%
ACS estimates describe the standing housing stock and occupied tenure. They do not measure current listings, transaction prices or asking rents.

Survey source: Census ACS 5-year — county housing value, tenure and stock · ACS 2024 5-year · pulled 2026-07-30. These values describe different housing universes and are not combined into gross yield.

Annual average covered jobs9,567▼ 0.7% from the prior annual release
Covered establishments893annual average reporting locations
Average weekly wage$1,434▲ 1.8% from the prior annual release
Largest private supersectorManufacturing26.2% of disclosed private covered jobs
Local labor base

Jobs, pay and private-sector concentration

2025
0%COVERED JOBS−0.7%WEEKLY WAGE+1.8%Manufacturing26.2%
Annual QCEW counts cover jobs located at reporting establishments. The industry share uses disclosed private covered employment; it is not a resident-employment measure or a forecast.

Workplace source: BLS QCEW — county employment and wages · annual county employment and wages 2025 vs 2024 · pulled 2026-07-31. QCEW counts covered jobs located in the county, not employed residents or the metro score’s CES/LAUS series.

County brief

What the local evidence says

01Decision frame

Union County presents a valuation-versus-income tension: Zillow’s June 2026 median home value is $363,556, up 3.98% year over year, while the annual 2025 FHFA repeat-transaction HPI rose 9.98%. FHFA supports a positive historical price direction but is not a dollar value; its observation differs in both vintage and method from Zillow’s measure. Investigating buyers should test whether acquisition basis is supported by property income, rather than treat either series as a closing-price comp.

02Housing economics

Median asking rent is $1,579 monthly, with a supplied 5.21% gross yield before expenses against the Zillow value. This is measured market rent. HUD’s $1,154 two-bedroom Fair Market Rent is instead a payment standard, not an asking-rent estimate. The 1.10% effective property-tax rate qualifies the gross-yield screen because financing, insurance, repairs, vacancy and other operating costs are not published. Asset-specific tax bills and operating statements are needed to assess net cash flow.

03Demand & competition

Demand evidence is mixed, not proof of tenant or buyer demand. Annual QCEW covered workplace employment declined 0.69%; Manufacturing, the largest disclosed private supersector, represents 26.20% of private covered employment. This is neither resident employment nor an unemployment measure. Tax-return migration shows a net outflow of 22 households, with departing households averaging $21,420 more AGI than arrivals. Investor purchase mortgages represented 8.72% of purchase mortgages: non-owner participation, not the full buyer pool.

04Risk & next checks

Inland flood is the dominant hazard; modeled annual building-value loss is 0.21%. It is not an insurance quote, so review location, elevation, policy premium and deductible, claims history and flood maps. Realtor.com MLS listing evidence—median asking price, active listings, days on market and reduced-share data—is not published; visible supply, marketing time and seller concessions cannot be assessed. Closed-sale comps, vacancy, turnover, unit-level lease comps and insurance costs are also not published, preventing conclusions on exit liquidity, stabilized net operating income or transferability to a target property.

Cities & communities

Where people live within Union County

Census-recognized incorporated places and CDPs that intersect this county. The list does not pretend to include every neighborhood or informal community.

Population scale

Largest Census places

ACS 2024 5-year
Dakota Dunes CDP3.9KNorth Sioux City city3KElk Point city2.5KBeresford city*2.4KAlcester city989Jefferson city554Richland CDP107
Bars use total place population, not a county-share estimate. An asterisk marks a place that crosses a county line.
Official directory

7 Census places

Population
  1. 01
    Dakota Dunes CDPCensus-designated place
    3,936
  2. 02
    North Sioux City cityIncorporated place
    3,045
  3. 03
    Elk Point cityIncorporated place
    2,537
  4. 04
    Beresford cityIncorporated place · spans 2 counties
    2,360
  5. 05
    Alcester cityIncorporated place
    989
  6. 06
    Jefferson cityIncorporated place
    554
  7. 07
    Richland CDPCensus-designated place
    107

Population is the total place-wide ACS estimate, not an allocated county share. A place crossing a county line is labelled explicitly. Source: Census ACS 5-year — cities and communities · ACS 2024 5-year · pulled 2026-07-30.

Risk, demand and competition

The three things a price does not tell you

01
Risk & carrying costFEMA NRI + Census ACS
Dominant hazardinland flooding

0.213% of building value expected lost per year

Effective property tax1.10%

$3,317 median annual bill

02
DemandIRS SOI household flows
Net migration-22

607 in · 629 out

Arriving vs leaving income−$21,420

$73,585 arriving · $95,005 leaving

03
CompetitionHMDA financed purchases
Purchases by investors8.7%

19 of 218 mortgages

investorother financed
Same metro

The other counties in Sioux City, IA

A metro is an average of these. Which side of a county line a property sits on can change the tax bill, the hazard profile and the tenant pool.

CountyPopulationPriceRentYieldHazard
Union County17,081$364k$1,5795.2%inland flooding
Woodbury County106,247$210k$1,2167.0%inland flooding
Dakota County21,354$248kn/an/ainland flooding
Bear case

What can break the county thesis

  1. County-level value, rent and tax measures may not describe the target property.
  2. Inland-flood exposure and insurance terms can differ materially by parcel.
  3. Missing listing, sales, vacancy and operating-cost evidence may change liquidity and net-income conclusions.
Underwriting questions

Before pricing a property

Is the published rent measure a HUD payment standard?

No. The record separately publishes median asking market rent; the two-bedroom HUD FMR is a payment standard.

What does the QCEW employment measure represent?

It is annual covered employment at workplaces in the county, not resident employment or unemployment.

Can visible MLS supply and seller-concession conditions be assessed?

No. Realtor.com active listings, days on market and price-reduction evidence are not published.