Ingleside is a city primarily in San Patricio County, with small parts in Nueces County, in the U.S. state of Texas. Its population was 9,519 at the 2020 census. According to the United States Census Bureau, the city has a total area of 14.5 sq mi, of which 0.1 sq mi is covered by water. The city is almost entirely in San Patricio County, with slivers to the southeast in Nueces County.