Newcastle is an unincorporated town in Placer County, California. It is nestled in the Sierra Nevada foothills, 31 miles northeast of Sacramento. Newcastle generally has moderate winters and warm summers. The latitude of Newcastle is 38.874N, the longitude is -121.132W, and an elevation of 945 ft. The town's zip code is 95658 and area code 916. There is small town charm in this foothill community. Known to be family friendly, it is close to Folsom Lake, the American River and an abundance of fresh produce from area growers. It is centrally located between San Francisco and Lake Tahoe on Interstate 80, approximately 2 hours from both. Its location allows the residents the opportunity to enjoy the peacefulness of the country while being conveniently located only 30 miles from the hub of the Sacramento metropolitan area.