Credit Union Routing Number
Mass Bay Credit Union Routing Number
The routing number for Mass Bay Credit Union is 211083557. It is a credit union in South Boston, Massachusetts, NCUA charter 68137.
Data as of · size and membership from the NCUA 5300 call report. How we update
About Mass Bay Credit Union
Mass Bay Credit Union is based in South Boston, Massachusetts, and has been chartered since 1979. It reported $366.7M in assets for Q2 2026, the 31st largest of 120 credit unions headquartered in Massachusetts and 918th of 4,252 nationally. Assets were $359.0M a year earlier (Q2 2025), so the credit union is larger now. It counted 17,761 members on that report. The NCUA lists 4 branch locations for the credit union.
Record
- Routing number
- 211083557
- NCUA charter number
- 68137
- RSSD ID
- 22196
- Headquarters
- South Boston, Massachusetts 02127
- Chartered
- 1979
- NCUA insured since
- April 11, 1994
- Total assets (Q2 2026)
- $366.7M
- Members (Q2 2026)
- 17,761
- Branch locations
- 4
- Routing record refreshed
- October 8, 2026
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View Mass Bay Credit Union's full profile →
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Regulator records: NCUA credit union profile (charter 68137) · FFIEC NIC profile (RSSD 22196)