Assuming you are looking for the tall, pointed Lombardy poplars, there are some in West Seattle Golf Course.
Not WS, but closer than Bothell …Per Arthur Lee Jacobson’s books on Seattle trees: Beacon Hill, north end of Jefferson Park Golf Course; Greenlake, north of the Bath House; UW, along Stevens Way by Architecture Hall; UW, along Montlake Cut; North Seattle, Evergreen Park/Washelli Cemetery on Aurora Ave. N.; Queen Anne, First Ave. W., north of W. Highland Drive; North Seattle, Ravenna Ave. N.E., north of N.E. 86th St.
Beautiful trees … unfortunately a lot have been lost lately to disease.