Arlington is located in Tarrant County, Texas within the Dallas–Fort Worth metropolitan area. According to the 2010 census results, the city had a population of 365,438, making it the third largest municipality in the Metroplex. Arlington is the fiftieth most populous city in the United States of America and the seventh most populous city in the state of Texas; it is also the largest city in the state that is not a county seat.

The median income for a household in the city was $47,622, and the median income for a family was $56,080. Males had a median income of $38,612 versus $29,339 for females. The per capita income for the city was $22,445. About 7.3% of families and 9.9% of the population were below the poverty line, including 12.3% of those under age 18 and 6.4% of those age 65 or over. Average rents in Arlington in 2005 were $537 for a one bedroom apartment, and $701 for a two bedroom apartment.