Bank routing number ยท Wauwatosa, Wisconsin
Waterstone Bank Routing Number (ABA): 275071770
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The Waterstone Bank routing number is 275071770. It is the primary ABA routing transit number on the bank's FFIEC National Information Center record, refreshed here on October 28, 2026.
Waterstone Bank at a glance
Its CET1 capital ratio was 18.66% at Q2 2026, comfortably above the 7% level required once the capital conservation buffer is included.
- Total assets, Q2 2026
- $2.25B
- CET1 ratio, Q2 2026
- 18.66%
- Deposit insurance
- FDIC
- Regulator
- FDIC
- Domestic offices
- 16 FDIC institution directory, current count
- Latest call report
- Q2 2026, FFIEC 041
- Established
- 1921
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Waterstone Bank routing numbers on file
| Routing number | Type | Status | Source |
|---|---|---|---|
| 275071770 | Primary ABA | Active | FFIEC NIC |
Record refreshed here on October 28, 2026. NIC holds one primary number per bank; Waterstone Bank 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, 7177, 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 Waterstone 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 Waterstone Bank checks or in its online banking. Ask the bank for wire instructions (www.wsbonline.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 Waterstone Bank
Waterstone Bank is headquartered in Wauwatosa, Wisconsin and was established in 1921. It is in the MILWAUKEE-WAUKESHA, WI metro area. It reported $2.25B in total assets and $1.47B in deposits for Q2 2026, the 13th largest of the 153 banks headquartered in Wisconsin. It reports 16 domestic offices. Its deposits have been FDIC insured since 1989. Its primary federal regulator is the FDIC. 2 other banks and credit unions headquartered in Wauwatosa have a routing number listed here.
What the digits in 275071770 mean
The first four digits, 2750, 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, 7177, 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 9 + 7 x 21 + 6 = 180, a multiple of 10, so 275071770 is a well-formed routing number. A mistyped digit almost always breaks that sum.
What is the Waterstone Bank routing number?
The Waterstone Bank routing number is 275071770. It is the primary ABA routing transit number registered to Waterstone Bank, headquartered in Wauwatosa, WI. The number comes from the FFIEC National Information Center institution record, last refreshed here on October 28, 2026.
What is the Waterstone Bank wire routing number?
This page lists the primary routing number registered to Waterstone Bank. The record does not say whether the bank uses the same number for wire transfers. Confirm the wire routing number with Waterstone Bank before sending a wire.
Is ABA number 275071770 the routing number for Waterstone Bank?
Yes. It is the primary routing number registered to Waterstone Bank.
Which bank uses routing number 275071770?
It belongs to Waterstone Bank, headquartered in Wauwatosa, WI. It is the bank's primary ABA routing number (FDIC certificate 28513).
Routing numbers of similar-size institutions in Wisconsin
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Regulator records: FDIC BankFind (cert 28513) · FFIEC NIC profile (RSSD 310978)