FDIC-insured bank
1st Security Bank of Washington — Mountlake Terrace, WA
Bank headquartered in Mountlake Terrace, Washington, part of FS BCORP INC.
Source: FDIC BankFind Suite, data as of June 30, 2026, fetched September 5, 2026
Headquarters and contact
| Address | 6920 220th St Sw Mountlake Terrace, WA 98043 |
| County | Snohomish |
| Metro area | Seattle-Tacoma-Bellevue, WA |
| Website | WWW.FSBWA.com |
| Phone | not published in FDIC data, see the bank's website |
FDIC record
| FDIC Certificate | 57633 |
| Federal Reserve RSSD ID | 1018927 |
| Status | Active |
| Charter class | SI (STATE) |
| Holding company | FS BCORP INC |
| Domestic offices | 31 |
| Financials as of | June 30, 2026 |
How to find your 1st Security Bank of Washington routing number
FDIC does not publish ABA routing numbers, and many banks use different routing numbers by state or by account type. The reliable places to find yours: the bottom left of a check from this bank, the "account details" screen in its online banking, or its official website at WWW.FSBWA.com.
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Offices nearest to headquarters
| 1St Security Bank Of Washington main office Mountlake Terrace, WA |
6920 220th St Sw, 98043 |
| Edmonds Edmonds, WA |
620 Edmonds Way, 98020 |
| Lynnwood Lynnwood, WA |
19002 33rd Ave W, 98036 |
| Mill Creek Mill Creek, WA |
15224 Main St, 98012 |
| Capitol Hill Branch Seattle, WA |
614 Broadway E, 98102 |
| Crossroads Branch Bellevue, WA |
1320 156th Ave Ne, 98007 |
| Poulsbo Poulsbo, WA |
21650 Market Pl Nw, 98370 |
| Silverdale Branch Silverdale, WA |
10574 Silverdale Way Nw, 98383 |
| Hadlock Branch Hadlock, WA |
10 Oak Bay Rd, 98339 |
| Port Townsend Branch Port Townsend, WA |
734 Water St, 98368 |
| Puyallup-Downtown Puyallup, WA |
307 W Stewart, 98371 |
| Puyallup Branch Puyallup, WA |
10514 156th St E, 98374 |
34 offices in total. Browse them by city through the state pages.
Where 1st Security Bank of Washington has offices
Cities with the most 1st Security Bank of Washington offices
Largest banks headquartered elsewhere in Washington
| WaFd Bank Seattle | $27.58 billion |
| Banner Bank Walla Walla | $16.59 billion |
| Washington Trust Bank Spokane | $10.54 billion |
| Heritage Bank Olympia | $8.42 billion |
| Coastal Community Bank Everett | $5.45 billion |
| Peoples Bank Bellingham | $2.42 billion |
| Cashmere Valley Bank Cashmere | $2.32 billion |
| First Fed Bank Port Angeles | $2.11 billion |
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