County banking markets / WI / 55109
St. CroixWisconsin
FIPS 55109. Branch offices reported to the FDIC Summary of Deposits, June 30 of each survey year, 1994–2025. One of 72 counties in Wisconsin’s 2025 survey.
Concentration, 1994–2025
Branch-count HHI squares each institution’s share of the county’s branch offices; deposit HHI squares its share of county deposits. The bands are the 2010 Horizontal Merger Guidelines classification, the dashed line the 1,800 level above which the Federal Reserve reviews a merger centrally. In 2025 this market is unconcentrated on branches (950) and unconcentrated on deposits (1,233).
Source: FDIC Summary of Deposits | DOJ & FTC, Horizontal Merger Guidelines (2010), section 5.3 | Federal Reserve, Competitive Effects of Mergers and Acquisitions FAQs Both indices computed from the SOD branch rows for this county, June 30 of each survey year. Neither is the Fed's screen HHI: no thrift weighting, no exclusion of specialty and internet banks, no central-booking adjustment. Methodology
Branches and institutions
21 branch offices and 15 institutions in 1994; 22 and 14 in 2025. Deposits booked in the county went from $381.5M to $2.11B, nominal.
Source: FDIC Summary of Deposits FDIC Summary of Deposits, June 30 of each survey year, 1994-2025. Methodology
Who holds the deposits, 2025
Every institution with a branch in the county, ranked by deposits booked here. Both shares are shown because they are the two indices above: squaring and summing the deposit column gives the deposit HHI, the branch column the branch-count HHI.
| # | Institution | Deposits | Deposit share | Branches | Branch share |
|---|---|---|---|---|---|
| 1 | Hiawatha National Bank cert 13058 | $396.0M | 18.75% | 3 | 13.64% |
| 2 | Associated Bank, National Association cert 5296 | $357.8M | 16.94% | 3 | 13.64% |
| 3 | Citizens State Bank cert 6194 | $312.7M | 14.80% | 3 | 13.64% |
| 4 | First National Community Bank cert 5357 | $266.7M | 12.63% | 3 | 13.64% |
| 5 | U.S. Bank National Association cert 6548 | $173.6M | 8.22% | 1 | 4.55% |
| 6 | Old National Bank cert 3832 | $159.9M | 7.57% | 1 | 4.55% |
| 7 | Wells Fargo Bank, National Association cert 3511 | $134.0M | 6.35% | 1 | 4.55% |
| 8 | Pillar Bank cert 5336 | $101.5M | 4.80% | 1 | 4.55% |
| 9 | MidWestOne Bank cert 14843 | $85.6M | 4.05% | 1 | 4.55% |
| 10 | Security Financial Bank cert 14222 | $43.6M | 2.07% | 1 | 4.55% |
| 11 | BMO Bank National Association cert 16571 | $41.2M | 1.95% | 1 | 4.55% |
| 12 | First State Bank and Trust cert 10159 | $33.7M | 1.59% | 1 | 4.55% |
| 13 | JPMorgan Chase Bank, National Association cert 628 | $5.6M | 0.27% | 1 | 4.55% |
| 14 | The First National Bank of River Falls cert 5364 | $0K | 0.00% | 1 | 4.55% |
Source: FDIC Summary of Deposits June 30, 2025. Branch rows grouped by FDIC certificate; names as reported to the survey. Deposit share is n/a where the county's total SOD deposits are zero. Methodology
Back to county banking markets, up to Wisconsin, or read the methodology for the two HHI constructions and what they cannot tell you.