Market Intelligence

Polk County, IA

Banking market profile · FDIC Summary of Deposits (SOD), June 30, 2026
Market Intelligence › Des Moines-West Des Moines-Ames, IA › Polk County

Polk County, Iowa, a core county of the Des Moines-West Des Moines-Ames, IA market, holds $32.2B in deposits across 39 insured institutions and 132 branches. Principal Bank is the largest deposit holder at 28.8% share. The top three banks hold 56% of deposits, which places the county in the Moderate band. Deposits have grown 45.5% since 2021 while the branch count fell by 4.3%. It produced $50.5B of real gross domestic product in 2024, ranking #91 of the 1,523 ranked counties by economic output.

Economic scale
2024 Real GDP
$50.5B
#91 of 1,523
Population
516,546
#145 of 1,523
GDP per Capita
$97,801
#62 of 1,523
Deposit market
Deposits (SOD, 6/30/26)
$32.2B
#83 of 1,523
Deposits per Capita
$62,293
#60 of 1,523
Deposits per Branch
$244M
#75 of 1,523
Competitive structure
Insured Institutions
39
#42 of 1,523
Branches per 100k Pop.
25.6
#679 of 1,523
Median Deposits per Institution
$129M
The median deposits booked by a single institution in the county. #673 of 1,523. A lower figure means institutions typically hold smaller deposit positions here; it reflects local deposit presence, not an institution’s overall size. See Community & Regional Bank Share for institution scale.
Community & Regional Bank Share
70.5%
of county deposits held by banks with $100M to $100B in assets. #751 of 1,523. A higher share points to a market where small to mid-size institutions, the kind that compete on relationships and local decision-making, hold more ground.
Top-3 Banks’ Deposit Share: Moderate
56%
The combined deposit share of the top three banks by deposits in the county. A lower share means deposits are spread across more institutions.

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

County Deposits (SOD, 2021 to 2026)+45.5% over 5 years
$22.1B
2021
$26.2B
2022
$27.0B
2023
$30.8B
2024
$29.8B
2025
$32.2B
2026

Branches: 138 in 2021 to 132 in 2026. Institutions: 39 to 39. Top-three share: 53% to 56%.

Institutions by deposits

InstitutionDepositsShareBranches5‑yr
deposits
Principal Bank$9.3B28.8%1+116%
Bankers Trust Company$5.5B17.1%12+51%
Wells Fargo Bank$3.2B10.1%11-13%
U.S. Bank$2.9B9.1%12+105%
Bank of America$2.9B8.9%4+113%
West Bank$2.4B7.6%5+15%
Community State Bank$1.2B3.9%9+35%
First Interstate Bank$531M1.7%5-53%
Northwest Bank$410M1.3%3+33%
Iowa State Bank$392M1.2%5+1%
Central Bank$360M1.1%5+7%
VisionBank of Iowa$355M1.1%5+70%
Lincoln Savings Bank$304M0.9%3+6%
BMO Bank$292M0.9%6-18%
Midwest Heritage Bank, FSB$257M0.8%6+33%
Luana Savings Bank$185M0.6%1+102%
First National Bank, Ames, Iowa$180M0.6%3+2%
Bank Iowa$161M0.5%2+18%
Charter Bank$152M0.5%3+7%
Grinnell State Bank$129M0.4%2+8%
State Savings Bank$122M0.4%1+35%
City State Bank$105M0.3%1-9%
Peoples Bank$97M0.3%1+67%
Great Southern Bank$96M0.3%4-9%
JPMorgan Chase Bank$93M0.3%5no 2021 presence
First Mid Bank & Trust$85M0.3%3-14%
Availa Bank$51M0.2%1+57%
Regions Bank$51M0.2%1+86%
Raccoon Valley Bank$50M0.2%1+144%
Home State Bank$46M0.1%1no 2021 presence
Freedom Financial Bank$41M0.1%1+25%
Earlham Savings Bank$38M0.1%2-13%
Liberty National Bank$26M0.1%1+16%
TruBank$19M0.1%1+8%
UMB Bank$18M0.1%1+45,700%
Keystone Savings Bank$18M0.1%1+8%
Twin Cedars Bank$16M0.1%1no 2021 presence
Nicolet National Bank$6M<0.1%1-30%
ITS Bank$0M<0.1%10%

The 39 insured institutions with a branch presence in this county, per the FDIC Summary of Deposits, June 30, 2026. Five-year change compares the same institution’s county deposits in 2021 and 2026. 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. “No 2021 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 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 73.8% of its deposits.

MeasurePolk CountyShare of parent market
2024 GDP$50.5B69.4%
Deposits$32.2B73.8%
Population516,54654.8%

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.

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Other counties in the Des Moines-West Des Moines-Ames market

All 293 markets and the 1,523 counties with a branch within a CSA or MSA are covered in the Market Intelligence resource. See the methodology for how each figure is built and when to expect updates, or the disclaimer for how this data should, and should not, be read.