Map for Cornerstone Tax Map for Cornerstone Tax Search | Advanced Search | New Members | Coupons and Discounts | All Categories Business & Professional Services >> TAX RETURN PREPARATION Cornerstone Tax 126 NE 3rd Ave.Hillsboro, OR 97124 | directions (503) 648-7336 | fax: (503) 640-2399 Visit Site If your business isn't here, contact us today to get listed!