Polk County, Iowa, a core county of the Des Moines-West Des Moines-Ames, IA market, holds $29.8B in deposits across 41 insured institutions and 130 branches. Principal Bank is the largest deposit holder at 28.1% share. The top three institutions hold 53.9% of deposits, which places the county in the moderately concentrated band. Deposits have grown 50.2% since 2020 while the branch count fell by 9. It produces $50.5B of output, ranking #91 of the 1,523 counties within a CSA or MSA by economic output.
Deposit trend
Branches: 139 in 2020 to 130 in 2025. Institutions: 36 to 41. Top-three share: 53.2% to 53.9%.
Leading institutions by deposits
| Institution | Deposits | Share | 5‑yr |
|---|---|---|---|
| Principal Bank | $8.4B | 28.1% | +118% |
| Bankers Trust Company | $4.4B | 14.9% | +33% |
| Wells Fargo Bank, National Association | $3.2B | 10.9% | -4% |
| U.S. Bank National Association | $3.2B | 10.8% | +134% |
| West Bank | $2.5B | 8.4% | +39% |
| Bank of America, National Association | $2.2B | 7.4% | +77% |
| Community State Bank | $1.3B | 4.2% | +64% |
| First Interstate Bank | $549M | 1.8% | -47% |
| Iowa State Bank | $378M | 1.3% | +9% |
| Northwest Bank | $367M | 1.2% | +24% |
The 10 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.
Part of the Des Moines-West Des Moines-Ames market
Polk County is one of 10 counties that make up the Des Moines-West Des Moines-Ames, IA market, a Combined Statistical Area (ranked #53 of 293 U.S. markets by economic output). It produces 69.4% of the market’s output and holds 73.0% of its deposits.
| Measure | Polk County | Share of Des Moines-West Des Moines-Ames market |
|---|---|---|
| 2024 GDP | $50.5B | 69.4% |
| Deposits | $29.8B | 73.0% |
| Population | 516,546 | 54.8% |
View the full Des Moines-West Des Moines-Ames market profile →
Recruiting in Polk 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 Polk County, on a retained basis.
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