Sinton is a city in San Patricio County, Texas, United States. The population was 5,676 at the 2000 census. It is the county seat of San Patricio County. It is named in honour of David Sinton.
Sinton is located at 28°2′5″N 97°30′32″W / 28.03472°N 97.50889°W / 28.03472; -97.50889 (28.034824, -97.508942).
According to the United States Census Bureau, the city has a total area of 2.2 square miles (5.7 km²), all of it land.