| Official Name: | Newcastle |
| Settlement Type: | census-designated place & unincorporated community |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Placer |
| Population Total: | 1321 |
| Population As Of: | 2020 |
| Population Density Km2: | auto |
| Population Footnotes: | [1] |
| Unit Pref: | Imperial |
| Area Footnotes: | [2] |
| Area Total Sq Mi: | 2.396 |
| Area Land Sq Mi: | 2.392 |
| Area Water Sq Mi: | 0.004 |
| Area Total Km2: | 6.206 |
| Area Land Km2: | 6.195 |
| Area Water Km2: | 0.011 |
| Area Water Percent: | 0.18 |
| Timezone: | Pacific (PST) |
| Utc Offset: | -8 |
| Timezone Dst: | PDT |
| Utc Offset Dst: | -7 |
| Elevation Ft: | 797 |
| Pushpin Map: | California#USA |
| Pushpin Map Caption: | Position in California. |
| Coordinates: | 38.8722°N -121.1306°W |
| Postal Code Type: | ZIP Code |
| Postal Code: | 95658 |
| Area Code: | 916, 279 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 2583089 |
Newcastle is an unincorporated community and census-designated place (CDP) in Placer County, California. Nestled in the Sierra Nevada foothills, Newcastle is located 8miles northeast of Rocklin and 31 miles northeast of Sacramento. Newcastle generally has moderate winters and warm summers.
The population of the CDP as of the 2010 U.S. Census is 1,224.
Newcastle was founded in the 19th century. According to Transcontinental Railroad Landmarks the "Regular freight and passenger trains began operating over the first 31 miles of Central Pacific's line to Newcastle June 10, 1864, when political opposition and lack of money stopped further construction during that mild winter. Construction was resumed in April, 1865." The region is also in the vicinity of what was the cradle of "gold country", where in the mid-19th century a flurry of miners and gold prospectors searched for their fortune. During this time, however, the town of Newcastle was known more for its orchards rather than abundant gold mines.
The Newcastle post office opened in 1864.
According to the United States Census Bureau, the CDP covers an area of 2.4 square miles (6.2 km), 99.82% of it land, and 0.18% of it water.
The 2010 United States Census[3] reported that Newcastle had a population of 1,224. The population density was 510.8sp=usNaNsp=us. The racial makeup of Newcastle was 1,113 (90.9%) White, 104 (8.5%) Hispanic or Latino of any race, 19 (1.6%) Native American, 17 (1.4%) Asian, 7 (0.6%) African American, 35 (2.9%) from other races, and 33 (2.7%) were from two or more races.
The Census reported that 1,216 people (99.3% of the population) lived in households, 8 (0.7%) lived in non-institutionalized group quarters, and 0 (0%) were institutionalized.
There were 545 households, out of which 115 (21.1%) had children under the age of 18 living in them, 258 (47.3%) were opposite-sex married couples living together, 42 (7.7%) had a female householder with no husband present, 23 (4.2%) had a male householder with no wife present. There were 25 (4.6%) unmarried opposite-sex partnerships, and 2 (0.4%) same-sex married couples or partnerships. 186 households (34.1%) were made up of individuals, and 117 (21.5%) had someone living alone who was 65 years of age or older. The average household size was 2.23. There were 323 families (59.3% of all households); the average family size was 2.86.
The population was spread out, with 220 people (18.0%) under the age of 18, 83 people (6.8%) aged 18 to 24, 191 people (15.6%) aged 25 to 44, 416 people (34.0%) aged 45 to 64, and 314 people (25.7%) who were 65 years of age or older. The median age was 51.3 years. For every 100 females, there were 91.3 males. For every 100 females age 18 and over, there were 92.3 males.
There were 597 housing units at an average density of 249.1sp=usNaNsp=us, of which 430 (78.9%) were owner-occupied, and 115 (21.1%) were occupied by renters. The homeowner vacancy rate was 4.4%; the rental vacancy rate was 12.2%. 923 people (75.4% of the population) lived in owner-occupied housing units and 293 people (23.9%) lived in rental housing units.