(Portland, OR)  --  Police in Washington County are searching for a missing and endangered woman.  The Washington County Sheriff's Office says 20-year-old Leah Stringer was last heard from on October 31st.  Investigators say there's been no activity on her social media accounts, and it's unclear whether she's still in the metro area.  She's described as five-foot-four and 130 pounds with a large tattoo of a lion and the St. Johns Bridge on her left thigh.