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Mass Bay routing numbers

Mass Bay's routing number is listed as 211 083 557 — use it for direct deposit, ACH, and domestic wires. (cross-checked against public directories — confirm before you send)

Cross-checkedNCUA 5300 Call Reportchecked June 28, 2026
⑆ Routing numbersMass Bay
Direct deposit, ACH & wiresCross-checked

Direct deposit, payroll, ACH transfers, and domestic wires

211 083 557

Cross-checked against public routing directories, not the bank itself. Always confirm with the bank before you send money.

Type
credit union
Headquarters
South Boston, MA
NCUA charter
68137
NCUA reported assets
$367.7M
All numbers

Every Mass Bay routing number

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Find it yourself

Find your Mass Bay number in your account

Find your Mass Bay routing number

Where to look: a check, online banking, the mobile app.

  1. Look at the bottom-left of a Mass Bay check — the first 9 digits are your routing number.
  2. Or sign in to online or mobile banking and open your account or routing details.
  3. Or call the number on the back of your card and ask for the ABA routing number for your account.
  4. Confirm the number with the bank before using it for direct deposit or a transfer.
Before you send

Check these before you send money

  • Confirm the bank name on the transfer matches Mass Bay.
  • Match the number to the transfer type — ACH and direct deposit use one number, domestic wires another.
  • For wires, double-check the recipient's name and address too.
  • If instructions arrived by email, confirm them on Mass Bay's official site or phone line before sending.
  • No one should ever need your password or full card number to confirm a routing number — that's a scam.
FAQ

Mass Bay routing number FAQ

What is Mass Bay's routing number?

Mass Bay's routing number is listed as 211 083 557 — use it for direct deposit, ACH, and domestic wires. (cross-checked against public directories — confirm before you send) The 9-digit routing number identifies the bank on a transfer; your account number identifies you.

How do I find my Mass Bay routing number?

Your routing number is the first 9 digits in the bottom-left of a Mass Bay check, or in your online and mobile banking under account or routing details. If anyone asks for your online-banking password or full card number to "verify" a routing number, it's a scam — a routing number alone is public.

Where is Mass Bay headquartered?

Mass Bay is a credit union headquartered in South Boston, MA.

How does fin.codes check Mass Bay's routing numbers?

Every number passes the standard ABA checksum. 1 is cross-checked against multiple public routing directories. fin.codes is an independent reference, not a bank — always confirm transfer details with Mass Bay before sending money.

Is fin.codes affiliated with Mass Bay?

No. fin.codes is an independent reference and is not affiliated with, authorized by, or endorsed by Mass Bay.

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Independent reference. Not affiliated with, endorsed by, or authorized by any financial institution. Confirm routing or SWIFT details directly with your bank before sending money.