Washington County, Oregon ENGINEERING/PLANNING FIRM & CONSULTANTS Washington County, Oregon ENGINEERING/PLANNING FIRM & CONSULTANTS Search | Advanced Search | New Members | Coupons and Discounts | All Categories Sort alphabetically by... Name City NW Engineers _ 3409 NE John Olsen Ave.Hillsboro, OR 97124 (503) 601-4401 Learn More | Visit Site | Show on Map Prescient Transmission Systems _ 5680 SE Pine St.Hillsboro, OR 97123 (503) 718-8905 Learn More | Visit Site | Show on Map If your business isn't here, contact us today to get listed!