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1st Security Bank of Washington Locations & Branches Mountlake Terrace, Washington
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1st Security Bank of Washington operates 30 branches from its headquarters in Mountlake Terrace, WA, .
1st Security Bank of Washington branch network
Its 30 branches span 2 states and 28 cities. The most are in WASHINGTON (25) and OREGON (5). WASHINGTON holds 87.8% of its branch deposits. Aberdeen, WA has the most of its branches, 2. Its largest office by deposits is its main office in Mountlake Terrace, WA, with $502.8M (20.4% of its branch deposits). On June 30, 2025 it had 29 branches, 1 fewer than in 2026.
1st Security Bank of Washington at a glance
Its CET1 capital ratio was 12.84% at Q2 2026, above regulatory requirements.
- Total assets, Q2 2026
- $3.18B
- CET1 ratio, Q2 2026
- 12.84%
- Deposit insurance
- FDIC
- Regulator
- FDIC
- Latest call report
- Q2 2026, FFIEC 051
- Established
- 2004
Full financial profile · Is 1st Security Bank of Washington safe? · 1st Security Bank of Washington 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: Mountlake Terrace, WA (1 branch) | 1 of 3 | 76.9% | $502.8M |
| State: WA (25 branches) | 13 of 61 | 1.0% | $2.16B |
Ranked by total assets among banks headquartered in the state: Largest banks in Washington.
Share by county and metro area
1st Security Bank of Washington'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 |
|---|---|---|---|---|
| Snohomish, WA (4 branches) | 7 of 22 | 4.0% | $798.8M | $20.10B |
| Grays Harbor, WA (6 branches) | 3 of 7 | 18.5% | $264.9M | $1.43B |
| Clallam, WA (2 branches) | 4 of 10 | 9.3% | $256.5M | $2.76B |
| Jefferson, WA (2 branches) | 1 of 7 | 25.0% | $232.5M | $928.4M |
| King, WA (2 branches) | 24 of 38 | 0.2% | $161.1M | $104.11B |
| Lincoln, OR (2 branches) | 4 of 8 | 10.5% | $130.6M | $1.25B |
| Thurston, WA (2 branches) | 12 of 15 | 2.3% | $120.8M | $5.34B |
| Pierce, WA (2 branches) | 14 of 22 | 0.6% | $120.8M | $18.77B |
| Klickitat, WA (2 branches) | 3 of 4 | 26.0% | $112.9M | $434.2M |
| Kitsap, WA (2 branches) | 10 of 13 | 2.3% | $95.5M | $4.22B |
Metro areas
| Metro area | Rank | Deposit share | Deposits | Metro total |
|---|---|---|---|---|
| Seattle-Tacoma-Bellevue, WA (8 branches) | 14 of 43 | 0.8% | $1.08B | $142.98B |
| Aberdeen, WA (6 branches) | 3 of 7 | 18.5% | $264.9M | $1.43B |
| Port Angeles, WA (2 branches) | 4 of 10 | 9.3% | $256.5M | $2.76B |
| Newport, OR (2 branches) | 4 of 8 | 10.5% | $130.6M | $1.25B |
| Olympia-Lacey-Tumwater, WA (2 branches) | 12 of 15 | 2.3% | $120.8M | $5.34B |
| Bremerton-Silverdale-Port Orchard, WA (2 branches) | 10 of 13 | 2.3% | $95.5M | $4.22B |
| Ontario, OR-ID (1 branch) | 6 of 11 | 7.6% | $78.0M | $1.02B |
| Kennewick-Richland, WA (1 branch) | 17 of 17 | <0.1% | $54K | $3.92B |
| Branch | Location | ZIP | Deposits |
|---|---|---|---|
| 1st Security Bank of Washington (main office) | Mountlake Terrace, WA | 98043 | $502.8M |
| Port Townsend Branch | Port Townsend, WA | 98368 | $133.3M |
| Sequim Branch | Sequim, WA | 98382 | $131.3M |
| Edmonds | Edmonds, WA | 98020 | $128.9M |
| Eighth Street Branch | Port Angeles, WA | 98362 | $125.2M |
| Lynnwood | Lynnwood, WA | 98036 | $116.2M |
| Aberdeen Branch | Aberdeen, WA | 98520 | $110.1M |
| Hadlock Branch | Hadlock, WA | 98339 | $99.3M |
| Puyallup-Downtown | Puyallup, WA | 98371 | $90.6M |
| Crossroads Branch | Bellevue, WA | 98007 | $89.7M |
| Newport Branch | Newport, OR | 97365 | $78.7M |
| Ontario Branch | Ontario, OR | 97914 | $78.0M |
| Poulsbo | Poulsbo, WA | 98370 | $76.1M |
| 04 - Olympia Branch | Olympia, WA | 98502 | $72.1M |
| Capitol Hill Branch | Seattle, WA | 98102 | $71.4M |
| Manzanita Branch | Manzanita, OR | 97130 | $60.1M |
| White Salmon Branch | White Salmon, WA | 98672 | $59.2M |
| Goldendale Branch | Goldendale, WA | 98620 | $53.7M |
| Waldport Branch | Waldport, OR | 97394 | $51.9M |
| Mill Creek | Mill Creek, WA | 98012 | $50.9M |
| 05 - Ocean Shores Branch | Ocean Shores, WA | 98569 | $48.9M |
| 06 - Lacey Branch | Lacey, WA | 98503 | $48.8M |
| 03 - Westport Branch | Westport, WA | 98595 | $46.5M |
| 02 - Elma Branch | Elma, WA | 98541 | $34.9M |
| Tillamook Branch | Tillamook, OR | 97141 | $32.9M |
| Puyallup Branch | Puyallup, WA | 98374 | $30.1M |
| 08 - Montesano Branch | Montesano, WA | 98563 | $24.6M |
| Silverdale Branch | Silverdale, WA | 98383 | $19.3M |
| Tri-Cities Branch | Kennewick, WA | 99336 | $54K |
| Aberdeen Branch | Aberdeen, WA | 98520 | $0 |
Source: FDIC Summary of Deposits, June 30, 2026. How the survey works.
Regulator records: FDIC BankFind (cert 57633) · FFIEC NIC profile (RSSD 1018927)