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Sioux County, IA Bank Deposit Market Share

American State Bank holds the largest share of deposits in Sioux County, IA, 37.9%, followed by Peoples Bank (21.6%) and Iowa State Bank (15.6%). 9 institutions hold $2.93B at 21 offices as of June 30, 2026, up 3.9% from 2025.

Institutions: 9 Offices: 21 Deposits: $2.93B Survey: FDIC Summary of Deposits, June 30, 2026

Largest share changes since 2025

Gained: Peoples Bank (1.59 points); Iowa State Bank (0.77 points); Premier Bank (0.31 points).

Lost: American State Bank (-2.47 points); Northwest Bank (-0.15 points); The Security National Bank of Sioux City, Iowa (-0.12 points).

# Institution Offices Deposits Market share Share change from 2025 Deposit change
1 American State Bank 9 $1.11B 37.86% -2.47 pts -2.4%
2 Peoples Bank 3 $632.3M 21.56% +1.59 pts 12.2%
3 Iowa State Bank 3 $456.7M 15.57% +0.77 pts 9.3%
4 Premier Bank 1 $316.1M 10.78% +0.31 pts 7.1%
5 The Security National Bank of Sioux City, Iowa 1 $155.5M 5.30% -0.12 pts 1.6%
6 Northwest Bank 1 $97.6M 3.33% -0.15 pts -0.7%
7 Primebank 1 $78.1M 2.66% +0.08 pts 7.1%
8 Rivers Edge Bank 1 $61.2M 2.09% +0.07 pts 7.4%
9 Citizens State Bank 1 $24.7M 0.84% -0.08 pts -5.2%

About this list

Deposits are those held at each institution's offices in Sioux County as of June 30, 2026, from the FDIC Summary of Deposits, whatever state the institution is headquartered in. Market share is the institution's deposits divided by all deposits in the market. Shares are by bank charter, not rolled up to the holding company, and cover FDIC-insured institutions only, so credit unions are not included. Each office is placed in its county and metro area by the FDIC branch directory; the few offices the directory does not list are left out of the market and of every share.

Share change compares the institution's share in 2025 and 2026 in percentage points. Deposit change compares its deposits here in the two years and includes deposits that moved through mergers and branch sales; "New" means it had no offices here a year earlier. Offices that closed during the year are placed by their ZIP code or city.

Wider markets

Iowa deposits by institution Iowa bank directory

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