Rock County, Wisconsin, a core county of the Madison-Janesville-Beloit, WI market, holds $3.5B in deposits across 18 insured institutions and 35 branches. The First National Bank and Trust Company is the largest deposit holder at 16.5% share. The top three institutions hold 44.4% of deposits, which places the county in the fragmented band. Deposits have grown 21.2% since 2020 while the branch count rose by 1. It produces $8.4B of output, ranking #407 of the 1,523 counties within a CSA or MSA 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: 34 in 2020 to 35 in 2025. Institutions: 17 to 18. Top-three share: 48.4% to 44.4%.
Leading institutions by deposits
| Institution | Deposits | Share | 5‑yr |
|---|---|---|---|
| The First National Bank and Trust Company | $579M | 16.5% | +37% |
| BMO Bank | $532M | 15.2% | -1% |
| Johnson Bank | $443M | 12.7% | +1% |
| First Mid Bank & Trust | $425M | 12.1% | no 2020 presence |
| Associated Bank | $380M | 10.9% | -6% |
| JPMorgan Chase Bank | $267M | 7.6% | +16% |
| Bank of Milton | $182M | 5.2% | +38% |
| Lake Ridge Bank | $139M | 4.0% | +65% |
| First Community Bank | $139M | 4.0% | +31% |
| Old National Bank | $91M | 2.6% | +42% |
The 10 largest of 18 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 organic growth; “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
Rock 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 12.0% of the market’s output and holds 10.0% of its deposits.
| Measure | Rock County | Share of parent market |
|---|---|---|
| 2024 GDP | $8.4B | 12.0% |
| Deposits | $3.5B | 10.0% |
| Population | 166,472 | 17.7% |
View the full Madison-Janesville-Beloit market profile →
Recruiting in Rock County
Deposits are spread across a competitive field of institutions, so the bankers worth recruiting are dispersed across more of them. 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 Rock County, on a retained basis.
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