Branch Network
Marathon Bank Locations & Branches Wausau, Wisconsin
BankRegReports is independent of Marathon Bank and never asks for online banking logins or passwords.
Marathon Bank operates 5 branches from its headquarters in Wausau, WI, .
Marathon Bank branch network
All 5 branches are in WISCONSIN, across 5 cities. Its largest office by deposits is its main office in Wausau, WI, with $107.3M (54.3% of its branch deposits). It had the same number of branches on June 30, 2025.
Marathon Bank at a glance
It reports no CET1 ratio; its Tier 1 leverage ratio was 15.34% at Q2 2026, above the 9% community bank leverage ratio requirement for being considered well capitalized.
- Total assets, Q2 2026
- $261.1M
- Tier 1 leverage ratio, Q2 2026
- 15.34%
- Deposit insurance
- FDIC
- Regulator
- FDIC
- Established
- 1902
Full financial profile · Is Marathon 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: Wausau, WI (1 branch) | 7 of 11 | 3.1% | $107.3M |
| State: WI (5 branches) | 123 of 185 | <0.1% | $197.8M |
Ranked by total assets among banks headquartered in the state: Largest banks in Wisconsin.
Share by county and metro area
Marathon 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 |
|---|---|---|---|---|
| Marathon, WI (3 branches) | 10 of 17 | 3.0% | $162.8M | $5.35B |
| Ozaukee, WI (1 branch) | 13 of 15 | 0.6% | $21.9M | $3.40B |
| Waukesha, WI (1 branch) | 34 of 34 | <0.1% | $13.1M | $18.94B |
Metro areas
| Metro area | Rank | Deposit share | Deposits | Metro total |
|---|---|---|---|---|
| Wausau-Weston, WI (3 branches) | 11 of 18 | 2.7% | $162.8M | $5.93B |
| Milwaukee-Waukesha, WI (2 branches) | 41 of 43 | <0.1% | $35.0M | $79.93B |
| Branch | Location | ZIP | Deposits |
|---|---|---|---|
| Marathon Bank (main office) | Wausau, WI | 54403 | $107.3M |
| Mosinee Branch | Mosinee, WI | 54455 | $32.6M |
| Rothschild Branch | Rothschild, WI | 54474 | $22.9M |
| Mequon Branch | Mequon, WI | 53092 | $21.9M |
| Brookfield Branch | Brookfield, WI | 53045 | $13.1M |
Source: FDIC Summary of Deposits, June 30, 2026. How the survey works.
Regulator records: FDIC BankFind (cert 29745) · FFIEC NIC profile (RSSD 596978)