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Sauk County, WI Bank Deposit Market Share

Bank of Prairie Du Sac holds the largest share of deposits in Sauk County, WI, 26.4%, followed by Baraboo State Bank (17.9%) and BMO Bank N.A. (13.7%). 13 institutions hold $2.44B at 25 offices as of June 30, 2026, up 11.9% from 2025.

Institutions: 13 Offices: 25 Deposits: $2.44B Survey: FDIC Summary of Deposits, June 30, 2026

Largest share changes since 2025

Gained: Bank of Wisconsin Dells (1.80 points); Farmers & Merchants Union Bank (1.42 points); Bank of Prairie Du Sac (1.09 points).

Lost: BMO Bank N.A. (-1.98 points); Baraboo State Bank (-0.82 points); Wells Fargo Bank, N.A. (-0.45 points).

# Institution Offices Deposits Market share Share change from 2025 Deposit change
1 Bank of Prairie Du Sac 2 $644.3M 26.43% +1.09 pts 16.7%
2 Baraboo State Bank 6 $437.5M 17.94% -0.82 pts 7.1%
3 BMO Bank N.A. 4 $334.3M 13.71% -1.98 pts -2.2%
4 Bank of Wisconsin Dells 1 $260.6M 10.69% +1.80 pts 34.6%
5 The Peoples Community Bank 2 $132.5M 5.44% -0.31 pts 6.0%
6 Community First Bank 2 $114.2M 4.68% -0.27 pts 5.8%
7 Associated Bank, N.A. 1 $108.3M 4.44% +0.11 pts 14.8%
8 Prevail Bank 1 $103.4M 4.24% -0.26 pts 5.5%
9 Wells Fargo Bank, N.A. 1 $99.2M 4.07% -0.45 pts 0.9%
10 Royal Bank 2 $59.0M 2.42% -0.43 pts -4.9%
11 Farmers & Merchants Union Bank 1 $58.8M 2.41% +1.42 pts 171.8%
12 Lake Ridge Bank 1 $49.8M 2.04% +0.02 pts 13.0%
13 Bank of Mauston 1 $36.1M 1.48% +0.09 pts 18.8%

About this list

Deposits are those held at each institution's offices in Sauk County as of June 30, 2026, from the FDIC Summary of Deposits, whatever state the institution is headquartered in. Market share is the institution's deposits divided by all deposits in the market. Shares are by bank charter, not rolled up to the holding company, and cover FDIC-insured institutions only, so credit unions are not included. Each office is placed in its county and metro area by the FDIC branch directory; the few offices the directory does not list are left out of the market and of every share.

Share change compares the institution's share in 2025 and 2026 in percentage points. Deposit change compares its deposits here in the two years and includes deposits that moved through mergers and branch sales; "New" means it had no offices here a year earlier. Offices that closed during the year are placed by their ZIP code or city.

Wider markets

Wisconsin deposits by institution Baraboo, WI metro area Wisconsin bank directory

Other counties in Wisconsin

Milwaukee CountyDane CountyWaukesha CountyBrown CountyMarathon CountyRacine CountyOutagamie CountyWashington CountyKenosha CountyLa Crosse CountyRock CountyOzaukee CountySheboygan CountyFond Du Lac CountyWood CountyWinnebago CountyWalworth CountyEau Claire CountyJefferson CountyManitowoc CountySt. Croix CountyColumbia CountyPortage CountyDodge CountyGrant CountyGreen Lake CountyGreen CountyBarron CountyChippewa CountyDoor CountyMarinette CountyOneida CountyWaupaca CountyDouglas CountyMonroe CountyPolk CountyVilas CountyCalumet CountyPierce CountyTrempealeau County

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