Quadri-, quadru-, quadr-is a Latin prefix related to the verb quadrare âto make squareâ, quadratus âsquareâ etc. Quad is simply an English shortening of quadrangle, quadruplet etc. So quadri-and quad are actually the same word.
Seattle, WA Sales Tax Rate. The current total local sales tax rate in Seattle, WA is 9.600% . The December 2014 total local sales tax rate was 9.500% .
A county-wide sales tax rate of 1.30% is applicable to localities in Cowlitz County, in addition to the 6.50% Washington sales tax. Some cities and local governments in Cowlitz County collect additional local sales taxes, which can be as high as 0.3%.