Kirby is a city in Bexar County, Texas, United States. According to the 2020 United States Census, there were 8,142 people in the city. It is an enclave of San Antonio and is part of the San Antonio metropolitan statistical area. Founded as an agricultural settlement along the Southern Pacific railroad, the city was transformed into a suburban community upon its incorporation in 1955. It is known as the "Hobo Capital of Texas."