Branch Network
Southern Illinois Bank Locations & Branches Johnston City, Illinois
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Southern Illinois Bank operates 5 branches from its headquarters in Johnston City, IL, .
Southern Illinois Bank branch network
All 5 branches are in ILLINOIS, across 5 cities. Its largest office by deposits is the West Frankfort Branch office in West Frankfort, IL, with $63.6M (55.7% of its branch deposits). It had the same number of branches on June 30, 2025.
Southern Illinois Bank at a glance
It reports no CET1 ratio; its Tier 1 leverage ratio was 17.72% at Q2 2026, above the 9% community bank leverage ratio requirement for being considered well capitalized.
- Total assets, Q2 2026
- $136.5M
- Tier 1 leverage ratio, Q2 2026
- 17.72%
- Deposit insurance
- FDIC
- Regulator
- FDIC
- Latest call report
- Q2 2026, FFIEC 051
- Established
- 1999
Full financial profile · Is Southern Illinois Bank safe? · Southern Illinois Bank call report · 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: Johnston City, IL (1 branch) | 2 of 2 | 30.4% | $22.1M |
| State: IL (5 branches) | 283 of 379 | <0.1% | $114.1M |
Ranked by total assets among banks headquartered in the state: Largest banks in Illinois.
Share by county and metro area
Southern Illinois 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 |
|---|---|---|---|---|
| Franklin, IL (3 branches) | 4 of 9 | 10.7% | $88.1M | $826.1M |
| Williamson, IL (2 branches) | 12 of 14 | 1.4% | $26.1M | $1.90B |
Metro areas
| Metro area | Rank | Deposit share | Deposits | Metro total |
|---|---|---|---|---|
| Carbondale-Marion, IL (2 branches) | 16 of 18 | 0.8% | $26.1M | $3.40B |
| Branch | Location | ZIP | Deposits |
|---|---|---|---|
| West Frankfort Branch | West Frankfort, IL | 62896 | $63.6M |
| Southern Illinois Bank (main office) | Johnston City, IL | 62951 | $22.1M |
| Zeigler Branch | Zeigler, IL | 62999 | $12.5M |
| Thompsonville Branch | Thompsonville, IL | 62890 | $12.0M |
| Herrin Branch | Herrin, IL | 62948 | $4.0M |
Source: FDIC Summary of Deposits, June 30, 2026. How the survey works.
Regulator records: FDIC BankFind (cert 35229) · FFIEC NIC profile (RSSD 2847085)