The Hamilton County Highway Department maintains roughly 370 miles of asphalt roads in the unincorporated areas of the county. As part of the maintenance conducted on the county's asphalt roads, around 15 - 25 miles of roads are resurfaced annually. The resurface program is administered by the Hamilton County Highway Department and carried out by INDOT approved paving contractors.
In 2021, 16.89 miles of asphalt roads have been resurfaced as part of the Contract Resurface program. For a list of roads which have recently been resurfaced, see the document below.