Hendricks County is a county in the U.S. state of Indiana. As of the 2020 United States Census, the population was 174,788. The county seat is the town of Danville. Hendricks County is the third largest county in the Indianapolis-Carmel-Anderson, IN Metropolitan Statistical Area. Hendricks County is currently the second fastest-growing county in Indiana and …Hendricks County is a county in the U.S. state of Indiana. As of the 2020 United States Census, the population was 174,788. The county seat is the town of Danville. Hendricks County is the third largest county in the Indianapolis-Carmel-Anderson, IN Metropolitan Statistical Area. Hendricks County is currently the second fastest-growing county in Indiana and 85th in the nation.