Union County, South Dakota, a core county of the Sioux City-Le Mars, IA-NE-SD market, holds $809M in deposits across 9 insured institutions and 12 branches. Liberty National Bank is the largest deposit holder at 29.6% share. The top three institutions hold 59.6% of deposits, which places the county in the moderately concentrated band. Deposits have grown 23.0% since 2020 while the branch count rose by 1. It produces $1.8B of output, ranking #973 of the 1,523 counties within a CSA or MSA by economic output.
Deposit trend
Branches: 11 in 2020 to 12 in 2025. Institutions: 8 to 9. Top-three share: 66.0% to 59.6%.
Leading institutions by deposits
| Institution | Deposits | Share | 5‑yr |
|---|---|---|---|
| Liberty National Bank | $239M | 29.6% | +4% |
| Premier Bank | $148M | 18.3% | +20% |
| First Dakota National Bank | $95M | 11.7% | +82% |
| First Savings Bank | $95M | 11.7% | +34% |
| Security National Bank of South Dakota | $84M | 10.4% | +3% |
| Pioneer Bank | $65M | 8.0% | +108% |
| Central Bank | $61M | 7.6% | +17% |
| Peoples Bank | $13M | 1.6% | no 2020 presence |
| 1st Financial Bank USA | $9M | 1.1% | -47% |
The 9 insured institutions with a branch presence in this county, as of June 30, 2025. Five-year change compares the same institution’s county deposits in 2020 and 2025. Institutions are tracked by FDIC certificate number, and where an institution acquired another bank, the acquired bank’s prior deposits are folded into the baseline so the change reflects the combined, continuing franchise rather than reading as new. Even so, a large gain can reflect acquisition rather than competitive growth; “no 2020 presence” means neither the institution nor a bank it later absorbed reported deposits in this county that year.
Part of the Sioux City-Le Mars market
Union County is one of 4 counties that make up the Sioux City-Le Mars, IA-NE-SD market, a Combined Statistical Area (ranked #187 of 293 U.S. markets by economic output). It produces 17.0% of the market’s output and holds 13.7% of its deposits.
| Measure | Union County | Share of Sioux City-Le Mars market |
|---|---|---|
| 2024 GDP | $1.8B | 17.0% |
| Deposits | $809M | 13.7% |
| Population | 17,402 | 10.2% |
View the full Sioux City-Le Mars market profile →
Recruiting in Union County
Deposits are split among a moderate number of institutions. Who holds the deposits, and how contested the market is, shapes both the runway for growth and the competition you would be recruiting against. We recruit commercial relationship managers, banking teams, and market leaders for banks building in markets like Union County, on a retained basis.
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