Branch Network
MainStreet Bank Locations & Branches Fairfax, Virginia
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MainStreet Bank operates 7 branches from its headquarters in Fairfax, VA, . Its main office is at 10089 Fairfax Blvd, Fairfax, VA 22030.
MainStreet Bank branch network
Its 7 branches span 2 states and 7 cities. The most are in VIRGINIA (6) and DISTRICT OF COLUMBIA (1). VIRGINIA holds 77.8% of its branch deposits. Its largest office by deposits is its main office in Fairfax, VA, with $755.4M (39.0% of its branch deposits). On June 30, 2025 it had 6 branches, 1 fewer than in 2026.
MainStreet Bank at a glance
Its CET1 capital ratio was 14.10% at Q3 2026, comfortably above the 7% level required once the capital conservation buffer is included.
- Total assets, Q3 2026
- $2.23B
- CET1 ratio, Q3 2026
- 14.10%
- Deposit insurance
- FDIC
- Regulator
- Federal Reserve
- Latest call report
- Q3 2026, FFIEC 041
- Established
- 2004
Full financial profile · Is MainStreet Bank safe? · MainStreet Bank call report · Routing number
Deposit market share
Share of all FDIC-insured deposits held in each area, from the June 30, 2026 Summary of Deposits. Rank 1 is the largest holder. Shares are by bank charter, not by holding company.
| Area | Rank | Deposit share | Deposits |
|---|---|---|---|
| City: Fairfax, VA (1 branch) | 4 of 14 | 7.0% | $755.4M |
| State: VA (6 branches) | 26 of 102 | 0.5% | $1.51B |
Ranked by total assets among banks headquartered in the state: Largest banks in Virginia.
Share by county and metro area
MainStreet Bank's share of FDIC-insured deposits in the counties and metro areas where it has branches, from the June 30, 2026 Summary of Deposits. Up to the ten largest of each are shown, by the bank's deposits. Rank 1 is the largest holder. Banks only: credit unions are not in the Summary of Deposits.
Counties
| County | Rank | Deposit share | Deposits | County total |
|---|---|---|---|---|
| Fairfax City, VA (1 branch) | 3 of 12 | 13.1% | $755.4M | $5.76B |
| Fairfax, VA (2 branches) | 19 of 38 | 0.4% | $520.4M | $116.71B |
| District Of Columbia, DC (1 branch) | 16 of 34 | 0.8% | $429.7M | $55.87B |
| Loudoun, VA (2 branches) | 13 of 20 | 2.1% | $198.1M | $9.41B |
| Arlington, VA (1 branch) | 22 of 24 | 0.4% | $34.6M | $8.99B |
Metro areas
| Metro area | Rank | Deposit share | Deposits | Metro total |
|---|---|---|---|---|
| Washington-Arlington-Alexandria, DC-VA-MD-WV (7 branches) | 20 of 71 | 0.6% | $1.94B | $303.89B |
Deposits by county
Every county where MainStreet Bank has branches (5 in all), from the June 30, 2026 Summary of Deposits: the bank's deposits, its share of all FDIC-insured deposits in the county, its rank and its branch count there. Largest deposits first.
Show all 5 counties
| County | Branches | Deposits | Share | Rank |
|---|---|---|---|---|
| Fairfax City, VA | 1 | $755.4M | 13.1% | 3 of 12 |
| Fairfax, VA | 2 | $520.4M | 0.4% | 19 of 38 |
| District Of Columbia, DC | 1 | $429.7M | 0.8% | 16 of 34 |
| Loudoun, VA | 2 | $198.1M | 2.1% | 13 of 20 |
| Arlington, VA | 1 | $34.6M | 0.4% | 22 of 24 |
| Branch | Location | ZIP | Deposits |
|---|---|---|---|
| MainStreet Bank (main office) | Fairfax, VA | 22030 | $755.4M |
| Dc Branch | Washington, DC | 20036 | $429.7M |
| Mclean Branch | Mclean, VA | 22101 | $412.5M |
| Herndon Branch | Herndon, VA | 20170 | $107.9M |
| Middleburg Branch | Middleburg, VA | 20117 | $103.8M |
| Leesburg Branch | Leesburg, VA | 20176 | $94.3M |
| Arlington Branch | Arlington, VA | 22201 | $34.6M |
Source: FDIC Summary of Deposits, June 30, 2026. How the survey works.
Regulator records: FDIC BankFind (cert 57742) · FFIEC NIC profile (RSSD 3248849)