About This Place
Newcastle is a city in and the county seat of Weston County, Wyoming, United States. The population was 3,065 at the 2000 census.
Newcastle is located at 43°51′11″N 104°12′34″W / 43.85306°N 104.20944°W / 43.85306; -104.20944 (43.853183, -104.209343).
According to the United States Census Bureau, the city has a total area of 2.5 square miles (6.4 km²), all land.