Tarrant_County,_Texas | countySeat | Fort_Worth,_Texas Arlington,_Texas | isPartOf | Tarrant_County,_Texas Arlington,_Texas | isPartOf | Texas Tarrant_County,_Texas | country | United_States Texas | largestCity | Houston
Arlington is part of Tarrant County in the state of Texas but Houston is the largest city there. Tarrant County, Texas is located within the United States and their county seat is Fort Worth.