South Boston, MA
Credit union Mass Bay
Mass Bay is a federally insured credit union based in South Boston, Massachusetts.
- Type
- Credit union
- Charter
- State-chartered, federally insured credit union
- Primary regulator
- NCUA
- Established
- January 1, 1936
- Headquarters
- South Boston, MA
- NCUA charter #
- 68137
- Fed RSSD ID
- 22196
$367.7M
Total assets Data as of Q1 2026
$260.5M
Total deposits Data as of Q1 2026
4
Branch locations Data as of Q1 2026
17,688
Members Data as of Q1 2026
0.50%
Return on assets Data as of Q1 2026
Source: U.S. FDIC BankFind & NCUA 5300 Call Report (public data). Data sources · Data as of Q1 2026
Branches by state
Mass Bay operates 4 branch locations in Massachusetts. Select a state to drill down to its towns and individual branches.
Ownership
Mass Bay is not currently recorded under a holding company in the federal data — it appears to be independently held. See its structure & merger history for any past changes.
Other credit unions in Massachusetts
Federally insured credit unions headquartered in Massachusetts, by total assets.
- Rockland $3.74B
- Metro $3.3B
- Workers $2.51B
- Brightbridge $2.39B
- Hanscom $2.19B
- Jeanne D'Arc $2.19B
- Greylock $1.71B
- Webster First $1.5B
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- Marshall Community $369.6M