Terracon Consultants, Inc. Share: Civil EngineeringEnvironmental EngineeringGeotechnical Engineering Terracon Consultants, Inc. Visit Website 21905 64th Ave West Ste 100 Mountlake Terrace, WA 98043-2251 (425) 771-3304 (425) 771-3549 (fax) Map What's Nearby? Distance: 5 10 15 20 25 50 mi.