arlington,_texas | ispartof | tarrant_county,_texas <tsp> arlington,_texas | ispartof | texas <tsp> texas | country | united_states <tsp> texas | largestcity | houston <sep> arlington is a city in the us state of texas, located in tarrant county it forms part of the mid-cities region of the dallas–fort worth–arlington metropolitan statistical area, and is a principal city of the metropolis and region the city had a population of 394,266 in 2020, making it the second-largest city in the county, after fort worth, and the third-largest city in the metropolitan area, after dallas and fort worth arlington is the 50th-most populous city in the united states, the seventh-most populous city in the state of texas, and the largest city in the state that is not a county seat 
arlington. tarrant county is in texas. which has its largest city as houston. and is located in the united states.arlington is the 50th-most populous city in tarrant county texas texas united states