About This Place
Newcastle is the largest city in McClain County, Oklahoma, United States, and a part of the Oklahoma City Metropolitan Area. The population was 7,685 at the 2010 census.
Newcastle is located at 35°14′50.82″N 97°36′.22″W / 35.24745°N 97.6000611°W / 35.24745; -97.6000611 (35.145082, -97.360022).
According to the United States Census Bureau, the city has a total area of 62.5 square miles (162 km2), of which, 55.8 square miles (145 km2) of it is land and 6.7 square miles (17 km2) of it (6.01%) is water.