Branch Network
Frontier Bank Locations & Branches Sioux Falls, South Dakota
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Frontier Bank operates 5 branches from its headquarters in Sioux Falls, SD, .
Frontier Bank branch network
Its 5 branches span 2 states and 4 cities. The most are in IOWA (3) and SOUTH DAKOTA (2). IOWA holds 78.8% of its branch deposits. Sioux Falls, SD has the most of its branches, 2. Its largest office by deposits is the Rock Rapids Branch office in Rock Rapids, IA, with $214.2M (66.2% of its branch deposits). It had the same number of branches on June 30, 2025.
Frontier Bank at a glance
Its CET1 capital ratio was 11.28% at Q2 2026, above regulatory requirements.
- Total assets, Q2 2026
- $349.2M
- CET1 ratio, Q2 2026
- 11.28%
- Deposit insurance
- FDIC
- Regulator
- OCC
- Established
- 1994
Full financial profile · Is Frontier Bank safe? · Routing number
Deposit market share
Share of all FDIC-insured deposits held in each area, from the June 30, 2026 Summary of Deposits. Rank 1 is the largest holder. Shares are by bank charter, not by holding company.
| Area | Rank | Deposit share | Deposits |
|---|---|---|---|
| City: Sioux Falls, SD (2 branches) | 23 of 33 | <0.1% | $68.6M |
| State: SD (2 branches) | 57 of 82 | <0.1% | $68.6M |
| Largest deposit state: IA (3 branches) | 110 of 261 | 0.2% | $255.2M |
Ranked by total assets among banks headquartered in the state: Largest banks in South Dakota.
Share by county and metro area
Frontier Bank's share of FDIC-insured deposits in the counties and metro areas where it has branches, from the June 30, 2026 Summary of Deposits. Up to the ten largest of each are shown, by the bank's deposits. Rank 1 is the largest holder. Banks only: credit unions are not in the Summary of Deposits.
Counties
| County | Rank | Deposit share | Deposits | County total |
|---|---|---|---|---|
| Lyon, IA (3 branches) | 1 of 6 | 33.6% | $255.2M | $758.6M |
| Minnehaha, SD (2 branches) | 17 of 25 | <0.1% | $68.6M | $478.92B |
Metro areas
| Metro area | Rank | Deposit share | Deposits | Metro total |
|---|---|---|---|---|
| Sioux Falls, SD (2 branches) | 28 of 39 | <0.1% | $68.6M | $1.13T |
| Branch | Location | ZIP | Deposits |
|---|---|---|---|
| Rock Rapids Branch | Rock Rapids, IA | 51246 | $214.2M |
| Sioux Falls Branch | Sioux Falls, SD | 57108 | $46.7M |
| Little Rock Branch | Little Rock, IA | 51243 | $22.0M |
| Frontier Bank (main office) | Sioux Falls, SD | 57104 | $22.0M |
| George Branch | George, IA | 51237 | $19.0M |
Source: FDIC Summary of Deposits, June 30, 2026. How the survey works.
Regulator records: FDIC BankFind (cert 33922) · FFIEC NIC profile (RSSD 2218443)