Court directory

# King County - Municipal Courts - Mercer Island

## Court information

### Mercer Island Municipal Court

Physical address

12835 Newcastle Way, Ste 301, Newcastle, WA 98056

[Official court website](https://www.courts.wa.gov/court_dir/courtdirectory.pdf) Checked Aug 15, 2026 [Official court website](https://www.mercerisland.gov/municipalcourt) Checked Aug 15, 2026

Aliases: WA King County - Municipal Courts - Mercer Island · Washington King County - Municipal Courts - Mercer Island

## Assigned Judges

- [Jeff Gregory Judge](/kyj/judge/jeff-gregory-judge-king-county-municipal-courts-mercer-island-1844-wa)