Bank routing number ยท Springfield, Illinois
Security Bank, S.B. Routing Number (ABA): 271173452
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The Security Bank, S.B. routing number is 271173452. It is the primary ABA routing transit number on the bank's FFIEC National Information Center record, refreshed here on October 25, 2026.
Security Bank, S.B. at a glance
Its CET1 capital ratio was 18.26% at Q2 2026, comfortably above the 7% level required once the capital conservation buffer is included.
- Total assets, Q2 2026
- $244.5M
- CET1 ratio, Q2 2026
- 18.26%
- Deposit insurance
- FDIC
- Regulator
- FDIC
- Domestic offices
- 3 FDIC institution directory, current count
- Established
- 1906
Full financial profile · Is Security Bank, S.B. safe? · Branch locations
Security Bank, S.B. routing numbers on file
| Routing number | Type | Status | Source |
|---|---|---|---|
| 271173452 | Primary ABA | Active | FFIEC NIC |
Record refreshed here on October 25, 2026. NIC holds one primary number per bank; Security Bank, S.B. publishes any other numbers it uses itself.
What the digits mean
The first two digits, 27, place this number in the Federal Reserve Bank of Chicago's district (District 7): prefixes 21 to 32 are the district numbers assigned to thrift institutions. Digits five through eight, 7345, identify the institution within that district. The last digit, 2, is a check digit, and the number passes the standard check: weight the nine digits 3, 7, 1, 3, 7, 1, 3, 7, 1 and the sum is a multiple of 10.
Before you send money to Security Bank, S.B.
A routing number tells the payment network which financial institution holds an account. You give it with an account number for ACH transfers through the automated clearing house, such as direct deposit, bill pay and transfers from a checking account, which usually settle in one to two business days. An international wire to a US account normally needs the bank's SWIFT code as well.
Match this number against the one on your Security Bank, S.B. checks or in its online banking. Ask the bank for wire instructions (www.securitybk.com). Our record does not show whether this number receives wires. The Federal Reserve's E-Payments Routing Directory shows it: its Fedwire participant search lists the numbers that can receive Fedwire transfers, and its FedACH search lists those that receive ACH payments. How to confirm any routing number.
About Security Bank, S.B.
Security Bank, S.B. is headquartered in Springfield, Illinois and was established in 1906. It is in the SPRINGFIELD, IL metro area. It reported $244.5M in total assets and $185.5M in deposits for Q2 2026, the 170th largest of the 319 banks headquartered in Illinois. See the largest banks in Illinois by total assets. It reports 3 domestic offices. Its deposits have been FDIC insured since 1989. Its primary federal regulator is the FDIC. 11 other banks and credit unions headquartered in Springfield have a routing number listed here.
What the digits in 271173452 mean
The first four digits, 2711, are the Federal Reserve routing symbol. The prefix 27 places the number in the 7th Federal Reserve District (Chicago), a range the ABA plan set aside for thrift institutions. That is also the district where the bank is headquartered. Digits five through eight, 7345, identify the institution within its Federal Reserve district. The last digit, 2, is a check digit. Weighting the digits 3, 7 and 1 in turn gives 3 x 7 + 7 x 19 + 6 = 160, a multiple of 10, so 271173452 is a well-formed routing number. A mistyped digit almost always breaks that sum.
What is the Security Bank, S.B. routing number?
The Security Bank, S.B. routing number is 271173452. It is the primary ABA routing transit number registered to Security Bank, S.B., headquartered in Springfield, IL. The number comes from the FFIEC National Information Center institution record, last refreshed here on October 25, 2026.
What is the Security Bank, S.B. wire routing number?
This page lists the primary routing number registered to Security Bank, S.B. The record does not say whether the bank uses the same number for wire transfers. Confirm the wire routing number with Security Bank, S.B. before sending a wire.
Is ABA number 271173452 the routing number for Security Bank, S.B.?
Yes. It is the primary routing number registered to Security Bank, S.B.
Which bank uses routing number 271173452?
It belongs to Security Bank, S.B., headquartered in Springfield, IL. It is the bank's primary ABA routing number (FDIC certificate 27723).
Routing numbers in Springfield, IL
- Bank
- INB, N.A.: 071109338
- Bank
- Bank of Springfield: 071108559
- Bank
- Prairie State Bank & Trust: 071114763
- Credit union
- Heartland Credit Union: 271189446
- Credit union
- Illinois State Police Federal Credit Union: 271189336
- Credit union
- Illinois Educators Credit Union: 271189433
- Credit union
- Springfield City Employees Credit Union: 271189488
- Credit union
- Financial Partners Credit Union: 271189491
View Security Bank, S.B.'s full profile →
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Regulator records: FDIC BankFind (cert 27723) · FFIEC NIC profile (RSSD 218878)