madison_county,_indiana | country | united_states <tsp> alexandria,_indiana | ispartof | madison_county,_indiana <sep> madison county is a county in the us state of indiana the 2020 census states the population is standing at 130,129 the county seat since 1836 has been anderson, one of three incorporated cities within the county madison county is included in the indianapolis-carmel-anderson, in metropolitan statistical area 
alexandria is part of madison county. indiana. which is in the country of the united states.madison county is a county in the u.s. state of indiana