Sauk County, Wisconsin, a core county of the Madison-Janesville-Beloit, WI market, holds $2.2B in deposits across 13 insured institutions and 25 branches. Bank of Prairie du Sac is the largest deposit holder at 25.3% share. The top three banks hold 60% of deposits, which places the county in the Concentrated band. Deposits have grown 20.1% since 2020 while the branch count fell by 7.4%. It produces $4.2B of output, ranking #660 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: 27 in 2020 to 25 in 2025. Institutions: 13 to 13. Top-three share: 61% to 60%.
Institutions by deposits
| Institution | Deposits | Share | 5‑yr deposits |
|---|---|---|---|
| Bank of Prairie du Sac | $552M | 25.3% | +24% |
| Baraboo State Bank | $409M | 18.8% | +20% |
| BMO Bank | $342M | 15.7% | +6% |
| Bank of Wisconsin Dells | $194M | 8.9% | +62% |
| The Peoples Community Bank | $125M | 5.7% | +28% |
| Community First Bank | $108M | 5.0% | +29% |
| Wells Fargo Bank | $98M | 4.5% | +11% |
| Prevail Bank | $98M | 4.5% | +50% |
| Associated Bank | $94M | 4.3% | +22% |
| Royal Bank | $62M | 2.8% | +32% |
| Lake Ridge Bank | $44M | 2.0% | no 2020 presence |
| Bank of Mauston | $30M | 1.4% | +23% |
| Farmers and Merchants Union Bank | $22M | 1.0% | no 2020 presence |
The 13 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 Madison-Janesville-Beloit market
Sauk County is one of 6 counties that make up the Madison-Janesville-Beloit, WI market, a Combined Statistical Area (ranked #56 of 293 U.S. markets by economic output). It produces 6.0% of the market’s output and holds 6.2% of its deposits.
| Measure | Sauk County | Share of parent market |
|---|---|---|
| 2024 GDP | $4.2B | 6.0% |
| Deposits | $2.2B | 6.2% |
| Population | 66,652 | 7.1% |
View the full Madison-Janesville-Beloit market profile →
Recruiting in Sauk 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 Sauk County.
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