Union County, South Dakota property search
Search an address or an owner in Union County, South Dakota with the box at the top of the map, or tap a lot, for its owner, lines and acreage. 13,655 lots are mapped here, covering 294,964 acres. 3,408 of them are held by institutions rather than by individuals.
Farmers and landowners in Union County received $29.9 million in federal farm program payments in 2025, paid to 763 recipients. 80 acres of agricultural land here are disclosed as foreign-held, the most by owners from Greece. Crop insurance paid $21.3 million in claims for the 2024 crop year.
- 13,655
- Lots mapped
- 294,964
- Acres
- 3,408
- Institutional
Largest landowners in Union County
Largest landowners by acreage in Union County, South Dakota| Owner | Parcels | Acres |
|---|
| MARIMAC INC (D) | 35 | 2,661 |
|---|
| STATE OF SD (D) | 397 | 2,373 |
|---|
| JJ TRUDEAU FARMS LLLP (D) | 36 | 2,232 |
|---|
| VAN BALLEGOOYEN FARMS LLC (D) | 25 | 1,969 |
|---|
| PATHFINDER LAND CO LP (D) | 13 | 1,493 |
|---|
| M & M HEEREN LLC (D) | 20 | 1,445 |
|---|
| LAFLEUR FARMS (D) | 6 | 1,141 |
|---|
| WAGNER LIMITED PARTNERSHIP & (D) | 17 | 1,139 |
|---|
| UNION COUNTY (D) | 588 | 1,128 |
|---|
| WAGNER LIMITED PARTNERSHIP (D) | 13 | 985 |
|---|
Companies, trusts and public agencies, ranked by acres held under the name on the assessor's file. Private individuals are not ranked. Largest landowners in South Dakota
Federal farm payments in Union County
- $29.9M
- Paid in 2025
- 763
- Recipients
Federal farm program payments by program in Union County, South Dakota, 2025| Program | Paid |
|---|
| Agricultural Risk Coverage Program - County | $13.2M |
|---|
| Emergency Commodity Assistance Program | $7.8M |
|---|
| Supplemental Disaster Relief Non-Spec Crops | $6.5M |
|---|
| CRP Payment - Annual Rental | $1.8M |
|---|
| WECP17OF | $236K |
|---|
| Emergency Livestock Relief Program 2023-24 | $117K |
|---|
USDA Farm Service Agency payment files, 2025. Compare farm subsidies by county
Foreign-held farmland in Union County
- 80
- Acres disclosed
- 1
- Holdings
Foreign-held agricultural land by country in Union County, South Dakota, 2024| Country | Acres |
|---|
| Greece | 80 |
|---|
USDA Agricultural Foreign Investment Disclosure Act filings, holdings at the end of 2024. Only disclosed interests are counted. See foreign-owned farmland by county
Crop insurance in Union County
- 1,071
- Policies
- 217,372
- Insured acres
- $21.3M
- Claims paid
- 1.72
- Loss ratio
Crop insurance claims by crop in Union County, South Dakota, 2024| Crop | Claims |
|---|
| Corn | $12.5M |
|---|
| Soybeans | $8.4M |
|---|
| Hybrid Corn Seed | $245K |
|---|
| Pasture,Rangeland,Forage | $86K |
|---|
| Oats | $25K |
|---|
USDA Risk Management Agency Summary of Business, 2024 crop year.
Conservation and the power grid
- 7,617
- CRP acres, 2025
- 20
- Substations
- 230 kV
- Highest voltage
Conservation Reserve Program acres under contract (USDA FSA). Substations in service, from a public copy of the federal HIFLD layer.
Find out who owns a property in Union County by address, free, or work out a lot's acreage.
This copy of Union County's records was taken on August 12, 2026. Assessment records, not a survey.