Pierce County Library cyber-attack leaks data of 340,000 people
Pierce County Library in Washington state was hit by a cyber-attack that leaked personal information. In September 2025, a lawsuit alleging negligence and the exposure of more than 300,000 personal records came to light, and in December the number of victims was put at more than 340,000.
Key facts
- Affected organisation
- Pierce County Library
- Incident type
- Data breach
- Occurred / detected
- Not confirmed
- Scale of damage
- Personal information of more than 340,000 people
- Cause / method
- Cyber-attack
- Location
- United States
If your data was exposed
- Don’t tap links in texts, calls or emails that mention this incident and offer compensation, refunds or breach checks. Check directly on the organisation’s official website or app.
Timeline
- A lawsuit alleging the exposure of more than 300,000 personal records and negligence by the library came to light.
- The number of people affected by the Pierce County Library data breach was put at 340,000.
- The number of cyber-attack victims was reported to exceed 340,000.
5 related reports
- Pierce County library was hit by data breach. What was in the stolen files
- Pierce County Library accused of negligence in massive cyberattack, court filings show
- Pierce County library data breach sparks lawsuit, over 300K personal records exposed
- Pierce County Library Data Breach Impacts 340,000
- More than 340,000 impacted by cyberattack on library in large Washington county
The summary and key facts are written by AI from related reports and may contain errors. Check the original articles and the organisation’s official statements for accurate details.