McCook County, South Dakota, a county in the Sioux Falls, SD-MN market, holds $197M in deposits across 4 insured institutions and 4 branches. First Dakota National Bank is the largest deposit holder at 64.2% share. The top three banks hold 90% of deposits, which places the county in the Concentrated band. Deposits have grown 23.6% since 2020 while the branch count fell by 20.0%. It produces $309M of output, ranking #1,440 of the 1,523 ranked counties by economic output.
Ranks show where the county stands among the 1,523 ranked counties (those within a Combined or Metropolitan Statistical Area that have a branch). They describe relative position, not a rating of market quality or suitability.
Deposit trend
Branches: 5 in 2020 to 4 in 2025. Institutions: 4 to 4. Top-three share: 89% to 90%.
Institutions by deposits
| Institution | Deposits | Share | 5‑yr deposits |
|---|---|---|---|
| First Dakota National Bank | $126M | 64.2% | +35% |
| Rivers Edge Bank | $30M | 15.2% | +61% |
| Security State Bank | $21M | 10.7% | -29% |
| The Security State Bank | $20M | 9.9% | +11% |
The 4 insured institutions with a branch presence in this county, per the FDIC Summary of Deposits, 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. “No 2020 presence” means neither the institution nor a bank it later absorbed reported deposits in this county that year. Deposit figures are nominal and are not adjusted for inflation.
Part of the Sioux Falls market
McCook County is one of 5 counties that make up the Sioux Falls, SD-MN market, a Metropolitan Statistical Area (ranked #114 of 293 U.S. markets by economic output). It produces 1.3% of the market’s output and holds 0.0% of its deposits.
| Measure | McCook County | Share of parent market |
|---|---|---|
| 2024 GDP | $309M | 1.3% |
| Deposits | $197M | 0.0% |
| Population | 5,964 | 1.9% |
View the full Sioux Falls market profile →
Recruiting in McCook County
Deposits are held closely by the largest banks, which often means the bankers worth recruiting are inside a small 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 McCook County.
See how we help banks recruit commercial banking talent