Carmel is a suburban city in Hamilton County, Indiana, United States, immediately north of Indianapolis. With a population of 99,757 as of the 2020 census, the city spans 49 square miles across Clay Township and is bordered by the White River to the east and the Boone County line to the west. Although Carmel was home to one of the first electronic automated traffic signals in the country, the city has constructed 141 roundabouts between 1988 and 2022.