Welcome to the top site for Mercer Island homes for sale, covering all types of Mercer Island homes and real estate. This upscale Washington community is an exclusive place to live in the Seattle area, with Mercer Island homes ranging in price from $475,000 to $32 million. Mercer Island condos start in the $150,000 range for a 750 s.f. bachelor pad, but can sell for upwards of $1 million on the high end.