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Although there is apparently only one city named "Seattle", it's conventional for US place names to include the name of the state - Washington, in this case. Making this a habit can avoid such little embarrassments as arriving in Portland, Oregon when you were invited to Portland, Maine, which is over 4,000km east.
I know this thread is about a spoken address, but for the sake of completeness, you might like to know that a written address for the USA should include the standard postal abbreviation of the state after the town or city: Seattle, WA; Portland, OR, as well as the zip code.
"in or at" unit (e.g. unit A)
"on" floor (e.g..14/floor)
"in" block (e.g. block B)
"of" building (e.g. May Building)
"at" street (e.g. George Street)
"in" district (e.g. Seattle)
"in" state (e.g. Washington)
"in" country (e.g. USA)