List of former state highways in Indiana (1–199)

The Indiana State Highway system has undergone numerous changes throughout its history, leading to the decommissioning and renumbering of many routes. This list details former state highways in Indiana, numbered 1 through 199. Note that this is not an exhaustive list, and the exact routes and dates of decommissioning may be difficult to verify comprehensively for all numbers in this range. Many routes were re-designated as county roads or absorbed into other state highways. Further research in state archives and historical highway maps is recommended for complete information on individual routes. Specific details for each route are generally lacking in readily available sources, hence this entry is a framework requiring significant expansion.

{| class="wikitable" |+ Former Indiana State Highways (1-199) |- ! Number !! Former Designation !! Approximate Route (If Known) !! Year(s) Decommissioned !! Notes |- | 1 || || || ||
|- | 2 || || || ||
|- | 3 || || || ||
|- | ... || || || ||
|- | 199 || || || || |}

This table is intended to be expanded upon with accurate information for each former highway number. Information needed includes the original route designation, the approximate path the highway followed, the year(s) it was decommissioned, and any relevant notes regarding its history or re-designation. Sources should be cited for all information added to ensure accuracy and verifiability.

Further research is needed to provide a complete and accurate entry. Many sources focusing on Indiana's highway history are likely necessary to populate this table effectively.