Hollerback Open Space Park

Welcome to Hollerback Open Space Park in Mercer Island, Washington, a suburb of Seattle. This park helps protect over 5 acres of open space.

To contact the park office please call 206-275-7609.

Mercer Island Park Ordinances

*The following are prohibited; alcoholic beverages, defacing public property, explosives, harming of wildlife, illegal drugs, littering.

*The following are only allowed in designated areas; camping, fires, horses, motor vehicles (including watercraft), organized athletic play.

*The following require special permits; amplified sound, posting of signs, public assemblies, sales.

Please respect these rules the parks and all local, State of Washington, and United States statutes.