Start with Mercer Island’s actual service boundary
Mercer Island is a municipality in King County, Washington. The 2020–2024 American Community Survey 5-year estimate records 25,307 residents, with a margin of error of 32. That figure describes population; it does not establish legal demand, advertising competition, search volume, lead volume, or revenue. For Local Service Ads, the useful question is narrower: which service areas can your firm responsibly accept and serve? A profile limited to the firm’s real coverage may produce a more relevant inquiry mix than a broad area chosen only for apparent scale. The consultation should distinguish Mercer Island from King County and from any wider metropolitan coverage your firm may consider.
Recommended approach
Map each practice area against the places your firm serves, the matters it accepts, and the locations it can reach. Treat Mercer Island and King County as separate geographic decisions, not interchangeable labels. Review whether a wider service area would improve fit or simply increase unsuitable inquiries.
