The Washington Statistical Analysis Center (SAC) at the Office of Financial Management provides access to crime statistics through several methods; CrimeStats Online, the Uniform Crime Report (UCR), and the National Incident Based Reporting System (NIBRS). There is a web-based interface that allow users to query Washington crime data online, and the UCR and NIBRS data are available in Excel spreadsheets and SAS datasets. County-level summaries from the Criminal Justice Data Book are available in Excel as well.
Some of this data is also available from data.wa.gov in table and chart formats. Here's a sample: