On the street addresses, the rule is that even numbers run out from the center on the right side and Odd numbers are on the left. I used to be a postal carrier between the military and being in IT.

Seattle is broken down into quadrants E, N, W, S with sub quads of NE, NW, etc. They run out from the cener of Seattle proper. The numbered Streets go EW, Numbered Avenues go NS. Really screwy system but, it's Seattle. I get so lost without a GPS. Probably explains why I stay on the East side of the mountains for the most part.

Keith