Photo of Coastal Environmental Systems, Inc. Headquarters

Location & Directions

Coastal Environmental Systems, Inc.

820 First Avenue South
Seattle, WA 98134
Phone: 206-682-6048
Fax: 206-682-5658

Get MapQuest® Directions to Coastal

Seattle Area Sites of Interest

Olympic National Park
Seattle Symphony
Seattle-KC Convention and Visitors Bureau
Seattle.com Hotel Information
Seattle Harbor Tours (Argosy Cruises)

Directions to Coastal from Sea-Tac International Airport:

  1. Head south on Departures Dr (.4 mi)
  2. Continue onto Airport Expressway (1.3 mi)
  3. Keep right at the fork, follow signs for Washington 518 E/Interstate 5/Interstate 405 and merge onto WA-518 E (1.5 mi)
  4. Take the I-5 N exit on the left toward Seattle (0.6 mi)
  5. Merge onto I-5 N (9.4 mi)
  6. Take EXIT 164B for Edgar Martinez Dr S (0.7 mi)
  7. Turn right onto WA-519/Edgar Martinez Dr S (0.2 mi)
  8. Take the first right onto 1st Ave S (0.3 mi)
    • 1st Ave S is just past Occidental Ave S
  9. 820 1ST AVE S is on the right
    • Your destination is 0.2 miles past S Royal Brougham Way
    • If you reach Railroad Way S you've gone a little too far
    (Total 14.4 miles / Last updated 10/21/13)

Aerial View of Coastal

  Close Up Aerial Map