Alliant Insurance Services, Inc. Share: Insurance & Bonding Alliant Insurance Services, Inc. Visit Website 1420 5th Ave Suite 1500 Seattle, WA 98101 (206) 454-8049 About Map About A consultative Insurance Broking Team with over 30 years of experience focused on Professional Liability Insurance and a fitted insurance program for design professionals including their education. What's Nearby? Distance: 5 10 15 20 25 50 mi.