List of numbered roads in Indiana
   Standard highway markers
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| System information | |
|---|---|
| Notes: | Indiana Routes are generally state-maintained. |
| Highway names | |
| Interstates: | Interstate X (I-X) |
| US Highways: | U.S. Route X (US X) |
| State: | Indiana Route X (SR X) |
| System links | |
The Indiana Department of Transportation (INDOT) is responsible for the establishment and classification of a state highway network which includes Interstate Highways, U.S. Highways, and State Roads. There is no rule preventing the same numbering between state roads, U.S. routes, and Interstate highways, although traditionally, INDOT has avoided state road numbers which are the same as those on U.S. routes within the state.
Indiana has a mileage cap of 12,000 miles (19,000 km) for its highway system.
Many Indiana cities have business routes, but by law they are maintained by local governments, not INDOT.
Most Indiana counties use a numbering system for designating county roads based on a grid. The system is similar to latitude and longitude on the globe, where numbering begins at the Equator and Greenwich Prime Meridian, respectively.
Typically, the north-south road that divides the county into east and west parts is named "Meridian Road", or "Base Road" and the east-west road that divides the county into north and south parts is named "Division Road", just as the north-south street that divides Indianapolis between "east" and "west" is named Meridian Street. However, roads along the baselines are given a variety of names in different counties. For example, Rush County designates them both as Base Road. Howard County designates the east-west baseline road as 00 NS. Some Counties, like Gibson, use state roads or other highways as baselines. Gibson County uses US 41 and most of Indiana 64's route in the county as base roads.
Other roads in the county are identified by the distance (in miles) from the baseline, multiplied by 100, followed by the compass direction from the baseline. For example, road "200 E" would be a north-south road located 2 miles (3.2 km) east of the meridian line, and road "350 N" would be an east-west road located 3.5 miles (5.6 km) north of the division line. Roads along a county line may be given a grid designation or may be referred to as County Line Road.
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