Washington 509

SB Miles	Southbound down	Northbound up	NB Miles	Multiplex	Near City or Town	County
0.0	E Marginal Way		36.3		Seattle	King
0.9			35.4
1.3			34.7
3.0
4.0			31.9
5.2			30.6		Burien
6.1			29.8
7.5	Des Moines Memorial Dr	Des Moines Memorial Dr	28.3	Des Moines Memorial Dr
8.2	S Normandy Rd		27.8	Ambaum Blvd S
8.5	Ambaum Blvd S		27.6	S 174th St
8.6	S 174th St		27.4	1st Ave S
9.0	SW Normandy Rd		27.0
10.3	S 199th St		25.8
10.3	S 200th St		25.8
11.7	Des Moines Memorial Dr		24.4	Marine View Dr S	Des Moines
11.8	7th Pl S		24.3	Marine View Dr S
12.5	Marine View Dr S Kent Des Moines Rd		23.6	Kent Des Moines Rd
13.2	Kent Des Moines Rd 16th Ave S		22.9	16th Ave S
14.8	S 260th St Woodmont Dr S		21.2
15.6	S 272nd St		20.5
16.0	Pacific Hwy S		20.0	Pacific Hwy S	Federal Way
16.6	S 288th St		19.5	Pacific Hwy S
17.1	Pacific Hwy S		18.9	S Dash Point Rd
18.5	1st Ave S		17.6	SW Dash Point Rd
18.6	SW 301st St		17.4
19.9	SW 312th St		16.2
20.1	21st Ave SW		15.9
22.3	47th Ave SW		13.7
23.2	Dash Point State Park		12.9
25.6	Slayden Rd NE		10.5	East Side Dr NE Marine View Dr	Tacoma	Pierce
28.2	E 11th St		7.9	Marine View Dr
28.4	McMurray Rd NE		7.7
28.9	Norpoint Way NE		7.2
30.7	Taylor Way E		5.3	Marine View Dr Frontage Rd
32.7			3.4
			2.3
34.6			1.5
34.6			1.4
34.7	Pacific Ave S 21st St		1.4	S 21st St Pacific Ave
35.0	S 25th St		1.1	Pacific Ave
35.0	S Tacoma Way S 26th St		1.0
35.1	S 27th St		1.0
35.2
36.0	S 38th St Pacific Ave		0.0

Termini	WA-99 at E Marginal Way at the 1st Ave bridge in Seattle to WA-7 at S 38th St in Tacoma
Length	36.0 miles southbound; 36.3 northbound
"Where does it go?"	WA-509 is as close Washington gets to a "signature" state highway (example CA-1, FL-A1A), at least in the west. It runs along the eastern shore of Puget Sound from South Seattle to Tacoma, via Burien, Des Moines and Federal Way.