Main Street Bank
Marlborough, MA · Insured depository institution
Sonar Score
Caution
out of 100 · from public FDIC data
Reported March 31, 2026. The Sonar Score is an informational signal from public FDIC data — not a rating or financial advice.
Key figures
- Total assets
- $1.6B
- Total deposits
- $1.3B
- Branches
- 6
- Return on assets
- 0.53%
- Return on equity
- 4.86%
- Charter type
- Insured depository institution
- Established
- 1860
- FDIC cert #
- 90235
How the 49 breaks down
Capital ratio not reported.
Modest but positive returns.
Positive but moderate equity returns.
Mid-size institution.
Your deposits at Main Street Bank
Main Street Bank is an FDIC-insured institution (Cert #90235). Deposits are insured up to $250,000 per depositor, per ownership category, by the full faith and credit of the US government. Learn how to maximize your coverage →
6 branch locations
7 Main St
Ayer, MA 01432
81 Granger Blvd
Marlborough, MA 01752
80 Main St
Pepperell, MA 01463
6 E Main St
Southborough, MA 01772
101 W Main St
Northborough, MA 01532
186 Main St
Hudson, MA 01749
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