Bank routing number ยท Aurora, Illinois
Old Second National Bank Routing Number (ABA): 071900760
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The Old Second National Bank routing number is 071900760. It is the primary ABA routing transit number on the bank's FFIEC National Information Center record, refreshed here on October 27, 2026.
Old Second National Bank at a glance
Its CET1 capital ratio was 13.72% at Q2 2026, comfortably above the 7% level required once the capital conservation buffer is included.
- Total assets, Q2 2026
- $6.86B
- CET1 ratio, Q2 2026
- 13.72%
- Deposit insurance
- FDIC
- Regulator
- OCC
- Domestic offices
- 57 FDIC institution directory, current count
- Latest call report
- Q2 2026, FFIEC 041
- Established
- 1887
Full financial profile · Is Old Second National Bank safe? · Old Second National Bank call report · Branch locations
Old Second National Bank routing numbers on file
| Routing number | Type | Status | Source |
|---|---|---|---|
| 071900760 | Primary ABA | Active | FFIEC NIC |
Record refreshed here on October 27, 2026. NIC holds one primary number per bank; Old Second National Bank publishes any other numbers it uses itself.
What the digits mean
The first two digits, 07, place this number in the Federal Reserve Bank of Chicago's district (District 7). Digits five through eight, 0076, identify the institution within that district. The last digit, 0, 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 Old Second National Bank
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 Old Second National Bank checks or in its online banking. Ask the bank for wire instructions (www.oldsecond.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 Old Second National Bank
Old Second National Bank is headquartered in Aurora, Illinois and was established in 1887. It is in the CHICAGO-NAPERVILLE-ELGIN, IL-IN metro area. It reported $6.86B in total assets and $5.47B in deposits for Q2 2026, the 10th largest of the 319 banks headquartered in Illinois. It reports 57 domestic offices. Its deposits have been FDIC insured since 1934. Its primary federal regulator is the OCC. 4 other banks and credit unions headquartered in Aurora have a routing number listed here.
What the digits in 071900760 mean
The first four digits, 0719, are the Federal Reserve routing symbol. The prefix 07 places the number in the 7th Federal Reserve District (Chicago). That is also the district where the bank is headquartered. Digits five through eight, 0076, identify the institution within its Federal Reserve district. The last digit, 0, is a check digit. Weighting the digits 3, 7 and 1 in turn gives 3 x 16 + 7 x 13 + 1 = 140, a multiple of 10, so 071900760 is a well-formed routing number. A mistyped digit almost always breaks that sum.
What is the Old Second National Bank routing number?
The Old Second National Bank routing number is 071900760. It is the primary ABA routing transit number registered to Old Second National Bank, headquartered in Aurora, IL. The number comes from the FFIEC National Information Center institution record, last refreshed here on October 27, 2026.
What is the Old Second National Bank wire routing number?
This page lists the primary routing number registered to Old Second National Bank. The record does not say whether the bank uses the same number for wire transfers. Confirm the wire routing number with Old Second National Bank before sending a wire.
Is ABA number 071900760 the routing number for Old Second National Bank?
Yes. It is the primary routing number registered to Old Second National Bank.
Which bank uses routing number 071900760?
It belongs to Old Second National Bank, headquartered in Aurora, IL. It is the bank's primary ABA routing number (FDIC certificate 3603).
Routing numbers in Aurora, IL
- Credit union
- Fox Valley Credit Union: 271975456
- Credit union
- Aurora Policemen Credit Union: 271975498
- Credit union
- Aurora Firefighters Credit Union: 271975485
- Credit union
- Aurora Postal Employees Credit Union: 271975508
View Old Second National Bank's full profile →
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Regulator records: FDIC BankFind (cert 3603) · FFIEC NIC profile (RSSD 936136)