tarrant_county,_texas | largestcity | fort_worth,_texas <tsp> texas | capital | austin,_texas <tsp> arlington,_texas | ispartof | tarrant_county,_texas <tsp> arlington,_texas | ispartof | texas <tsp> tarrant_county,_texas | country | united_states <sep> tarrant county is located in the us state of texas as of 2020, it had a population of 2,110,640 it is texas' third-most populous county and the 15th-most populous in the united states its county seat is fort worth 
the capital of texas in the united states is austin and the state is the location of arlington. part of tarrant county. the county contains the largest city in texas which is fort worth.it is texas' third-most populous county and the 15th-most populous in the united states