19 99 523 | The date Alki changed its name to Seattle, May 23, 1853 +Denny & Seattle

Seattle founded by the Denny Party.

Notice the date of founding, November 18, 1851, the 322nd day of the year.  The Seal of the City of Portland was established March 22, not too far off.  That's Seattle's southern neighbor.
http://freetofindtruth.blogspot.com/2014/11/119-322-seal-of-portland-oregon.html

11/18/1851 = 11+18+18+51 = 98 (Seattle = 98, Kabbalah Cipher)
11/18/1851 = 11+18+(1+8+5+1) = 44 (Seattle = 44, RR) (Space Needle = 44, R)
11/18/1851 = 1+1+1+8+1+8+5+1 = 26 (206 area code)
11/18/51 = 11+18+51 = 80

The city was called Alki then.   Alki = 1+12+11+9 = 33

On May 23, 1953, it changed it's name to Seattle, a fitting change for the date.

523 is the 99th prime (May 23, or 5/23)
5/23/1853 = 5+23+18+53 = 99 (Thirteen = 99)

5/23/1853 = 5+23+(1+8+5+3) = 45
5/23/1853 = 5+2+3+1+8+5+3 = 27
5/23/53 = 5+23+53 = 81

Seattle, on December 2, 1869, was also incorporated.  Notice it is on the 122nd Meridian as well, something like 12/2, for December 2.