Seattle allows up to 8 un-related people in a single family home!
Another house hacking tidbit.
Despite the unfriendly landlord laws in the City of Seattle, land use and zoning regulations are quite favorable.
If you want to legally rent out rooms, Seattle explicitly allows up to 8 un-related people in a single family home!
Note that ADUs count towards the main house's 8 person limit though.
Best of luck!