Johnston Engineering Johnston Engineering Search | Advanced Search | New Members | Coupons and Discounts | All Categories   Business & Professional Services >> Professional Services >> Product Development Johnston Engineering 3009 S. Mt. Vernon St.STE. 4Spokane, WA 99223 (509) 290-1034 Visit Site Connect With Us Member Since: 2017 Send a message to: Johnston Engineering Your Name: Your Email: Subject: Message: (Date: 8/15/2022)