The 2012 NAICS (North American Industrial Classification System) Code for horizontal drilling (directional boring) falls under category 237990 “Other Heavy and Civil Engineering Construction”. Midland Boring Contractors NAICS | United Midlands Census Bureau Midland Boring Contractors NAICS | United Midlands Census Bureau The United Midlands Census Bureau is a principal agency of the U.S. Federal … Continue reading Boring NAICS Code