Most of Shoreline (first "city" north of Seattle) is zoned for 1 home per 10,000 sq ft. And, of course, their density is on arterials only.
Lake Forest Park, just next to Shoreline, is mostly zoned the same way. Even has some lots that *require* 20,000 square feet per home (that's a half acre!)
Most of Edmonds (just north of Shoreline) is zoned for 1 home per 10,000 sq ft. A lot of it is 2 homes per acre.
Burien, just south of Seattle. All this orange is 1 home per 7200 sq ft. All the yellow is 3 homes an acre
Lynnwood. 80% zoned for 1 home every 7200 sq ft. All density on the arterial (a dangerous urban highway)
SeaTac is nearly all 5 homes an acre. Most of the density is on the side adjacent to the airport. Great equity