Coffman Engineers, Inc. Share: Civil EngineeringElectrical EngineeringMechanical EngineeringStructural Engineering Coffman Engineers, Inc. Visit Website 1101 2nd Ave Ste 400 Seattle, WA 98101-2923 (206) 623-0717 (206) 624-3775 (fax) Map What's Nearby? Distance: 5 10 15 20 25 50 mi.