NCUA-insured credit union
Mass Bay
Credit Union headquartered in South Boston, Massachusetts.
Source: NCUA call report data, data as of March 31, 2026, fetched September 5, 2026
Headquarters and contact
| Address | 147 W 4Th St South Boston, MA 02127 |
| County | Suffolk |
| Website | not published in NCUA data |
| Phone | (617) 269-2700 |
NCUA record
| NCUA Charter | 68137 |
| Federal Reserve RSSD ID | 22196 |
| Status | Active |
| Charter type | 2 (STATE) |
| Financials as of | March 31, 2026 |
Routing number
NCUA does not publish ABA routing numbers, and many credit unions use different routing numbers by state or by account type. The reliable places to find yours: the bottom left of a check from this credit union, the "account details" screen in its online banking, or its official website.
See how your odds compare before you apply at Mass Bay.
Offices
| South Boston main office South Boston, MA |
147 W 4Th St, 02127 (617) 269-2700 8:45 AM to 4:15 PM |
| Everett Everett, MA |
183 Main St, 02149 (617) 269-2700 8:45am-4:15pm |
| Quincy Center Quincy, MA |
1250 Hancock St, 02169 (617) 269-2700 8:45 AM to 4:15 PM |
| Seaport Branch South Boston, MA |
409 D Street, 02127 (617) 269-2700 8:45 to 4:15 M-W, F8:45 to 6:00 Th |
Where Mass Bay has offices
Other credit unions headquartered in South Boston
| City of Boston | $546.18 million |
| Taupa Lithuanian | $29.58 million |