BANK & CREDIT UNION INTELLIGENCE

Banks in Polk County, IA

39 FDIC-insured banks operate 132 branches in Polk County, Iowa, holding $32.18B in total deposits as of the 2026 FDIC Summary of Deposits. Principal Bank leads the market with 28.8% share. Deposit market share is the clearest available measure of competitive position in a local market: it reflects where households and businesses actually keep their money, rather than where institutions advertise or how many branches they operate.

Polk County market profile

Understanding a deposit market requires knowing the market itself. These figures come from the US Census Bureau American Community Survey 2024 five-year estimates. Median family income is the measure federal regulators use to define low- and moderate-income thresholds under the Community Reinvestment Act, which is why it is reported here separately from household income.

Population503,175
Median family income$107,616
Median home value$262,100
Banks operating in county39
Bank branches132

Deposit market share in Polk County

Ranked by deposits held within county borders. A bank's county deposits are the sum across all of its branches in that county, so an institution with several locations appears once. Figures are as of June 30, 2026, the annual reporting date for the FDIC Summary of Deposits.

RankBankDepositsShareBranches
1 Principal Bank $9.26B 28.78% 1
2 Bankers Trust Company $5.50B 17.09% 12
3 Wells Fargo Bank, National Association $3.25B 10.10% 11
4 U.S. Bank National Association $2.94B 9.13% 12
5 Bank of America, National Association $2.86B 8.88% 4
6 West Bank $2.45B 7.60% 5
7 Community State Bank $1.24B 3.86% 9
8 First Interstate Bank $531.1M 1.65% 5
9 Northwest Bank $409.7M 1.27% 3
10 Iowa State Bank $392.0M 1.22% 5
11 Central Bank $359.5M 1.12% 5
12 VISIONBANK OF IOWA $355.2M 1.10% 5
13 Lincoln Savings Bank $304.3M 0.95% 3
14 BMO Bank National Association $291.9M 0.91% 6
15 Midwest Heritage Bank, FSB $257.0M 0.80% 6
16 Luana Savings Bank $185.4M 0.58% 1
17 First National Bank, Ames, Iowa $180.4M 0.56% 3
18 Bank Iowa $161.4M 0.50% 2
19 Charter Bank $152.0M 0.47% 3
20 Grinnell State Bank $129.4M 0.40% 2
21 State Savings Bank $122.0M 0.38% 1
22 City State Bank $105.1M 0.33% 1
23 Peoples Bank $96.9M 0.30% 1
24 Great Southern Bank $96.5M 0.30% 4
25 JPMorgan Chase Bank, National Association $93.4M 0.29% 5
26 First Mid Bank & Trust, National Association $85.3M 0.27% 3
27 Availa Bank $51.2M 0.16% 1
28 Regions Bank $50.6M 0.16% 1
29 Raccoon Valley Bank $50.0M 0.16% 1
30 Home State Bank $45.7M 0.14% 1
31 Freedom Financial Bank $40.6M 0.13% 1
32 Earlham Savings Bank $38.2M 0.12% 2
33 Liberty National Bank $25.9M 0.08% 1
34 TruBank $19.2M 0.06% 1
35 UMB Bank, National Association $18.3M 0.06% 1
36 Keystone Savings Bank $18.2M 0.06% 1
37 Twin Cedars Bank $16.3M 0.05% 1
38 Nicolet National Bank $5.7M 0.02% 1
39 ITS Bank $500,000 0.00% 1

About this data

The FDIC Summary of Deposits is an annual survey of branch office deposits filed by every FDIC-insured institution as of June 30 each year. It is the authoritative source for local deposit market share and is the dataset regulators use when assessing competitive effects of bank mergers. Because it is annual, it reflects a point in time rather than current balances. Vault republishes it without modification, free to access and free to cite. Available to AI agents at vaultbot.ai/mcp.