Credit Union Routing Number
Marin County Federal Credit Union Routing Number
The routing number for Marin County Federal Credit Union is 321177340. It is a credit union in San Rafael, California, NCUA charter 15659.
Data as of · size and membership from the NCUA 5300 call report. How we update
About Marin County Federal Credit Union
Marin County Federal Credit Union is based in San Rafael, California, and has been chartered since 1963. It reported $103.5M in assets for Q2 2026, the 149th largest of 239 credit unions headquartered in California and 1782nd of 4,252 nationally. Assets were $95.3M a year earlier (Q2 2025), so the credit union is larger now. It counted 4,120 members on that report. The NCUA lists 1 branch location for the credit union.
Record
- Routing number
- 321177340
- NCUA charter number
- 15659
- RSSD ID
- 472483
- Headquarters
- San Rafael, California 94903
- Chartered
- 1963
- NCUA insured since
- January 3, 1972
- Total assets (Q2 2026)
- $103.5M
- Members (Q2 2026)
- 4,120
- Branch locations
- 1
- Routing record refreshed
- October 8, 2026
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View Marin County Federal Credit Union's full profile →
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Regulator records: NCUA credit union profile (charter 15659) · FFIEC NIC profile (RSSD 472483)