Mainline Information Systems, Inc. Mainline Information Systems, Inc. Search | Advanced Search | New Members | Coupons and Discounts | All Categories Computers, IT & Technology >> Computers >> Computers - Consultants: Information Technology Mainline Information Systems, Inc. 1700 Summit Lake Dr.Tallahassee, FL 32317 | map | directions Doug Harell (850) 219-5000 Visit Site Connect With Us Member Since: 1995 If your business isn't here, contact us today to get listed!