Penryn, California

Del Oro High School is located in Loomis, California, and is a part of the Placer Union High School District. Del Oro High School opened for the instruction of freshmen and sophomores on September 28, 1959, one week after Colfax opened. It was founded in 1958 and currently has over 1600 students attending. The dropout rate is 2%, which is below the California state average.

Newcastle is an unincorporated community and census-designated place (CDP) in Placer County, California. Nestled in the Sierra Nevada foothills, Newcastle is located 8 miles (12.9 km) northeast of Rocklin and 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 (288 m). The town's zip code is 95658 and is in area codes 916 and 279. The population of the CDP as of the 2010 U.S. Census is 1,224.

Loomis (formerly Pine, Pino, Smithville, and Placer) is an incorporated town in Placer County, California, United States. It is part of the Sacramento–Arden-Arcade–Roseville Metropolitan Statistical Area. The town's population was reported as 6,836 in the 2020 United States Census. It shares borders with the city of Rocklin and the Census-Designated Places Penryn and Granite Bay.

KKFS (103.9 MHz The Fish) is a commercial FM radio station licensed to Lincoln, California, and serving the Sacramento metropolitan area. The station carries a Christian contemporary radio format and is owned by the Salem Media Group, which also owns KFIA, KTKZ and KSAC-FM. Salem uses "The Fish" as its branding for Christian contemporary stations in Los Angeles, Atlanta, Nashville and Cleveland. KKFS has an effective radiated power (ERP) of 6,000 watts. The transmitter is on Cherry Hill Road near Interstate 80 in Newcastle.

Gold Hill (formerly, Orr City) is an unincorporated community in Placer County, California. Gold Hill is located 6 miles (9.7 km) west of Auburn. It lies at an elevation of 354 feet (108 m).Gold Hill is located within the Sierra Nevada foothills, in a geologic region known as the West Belt, so named because it is west of the Mother Lode Belt. This West Belt contained scattered deposits of gold in quartz veins within the granitic bedrock. In 1851, after gold was discovered in Ophir and Auburn, Georgian prospectors followed the Auburn Ravine, looking for similar placer gold. They found gold in the ravine near an elevated area they named Gold Hill. In addition to the gravel deposits, the hill itself was developed by two companies, known as the Georgia and the Ohio, using ground sluicing from water in the ravine. The town's civil government was organized in the spring of 1852, with the election of a Justice of the Peace, and a Constable. The population of the mining community peaked in 1856.

Secret Ravine (also Auburn Station) is a former settlement in Placer County, California. Secret Ravine is located 3 miles (4.8 km) southwest of Newcastle. Correction: Gardiner writes in 1854 that the Secret Ravine Post Office is "near the Hawes Ranch." Elisha Hawes lived in Township 9, the 1860 census shows him continuing to receive mail at the Secret Ravine Post Office. Placer County records show that Elisha Hawes and his family sold the ranch in 1867, and that it was located on Secret Ravine near the intersection of what is now I-80 and Rocklin Road, in the area commonly called China Gardens. The Secret Ravine post office opened in 1854, changed its name to Auburn Station for a period in 1863 before changing back, and closed finally in 1868. Auburn Station was the Eastern Terminus of the Sacramento, Placer and Nevada Railroad, that town was active 1861 through 1863, at which time the railroad ceased to exist, the result being the Placer County Railroad War.

Ophir (also, Spanish Corral and Ophirville) is an unincorporated community in Placer County, California.Ophir is located 2.5 miles (4.0 km) west of Auburn. It lies at an elevation of 682 feet (208 m).Ophir addresses have the ZIP code of 95658, a Newcastle address.

Virginiatown (formerly, Virginia) is a former settlement in Placer County, California. Virginiatown is located on Auburn Ravine, 7.5 miles (12.1 km) west of Auburn.Virginiatown is California Historical Landmark #400. The town was the site of one of California's first railroads, built in 1852 to carry gold ore from the mines to Auburn Ravine. After the first wave of gold mining ended, wood-cutting became an important local industry, to support railroad construction and to fuel the kiln at the pottery mill in nearby Lincoln. A large number of Chinese miners moved into the area around this time and reworked the diggings; the white residents voted to expel the Chinese from town in 1860, claiming a "fire hazard", and the Chinese resettled just west of town. A Chinese temple stood outside Virginiatown as late as 1907, and two rammed-earth Chinese houses were still standing as of 1957.The site of Virginiatown is now occupied by rural homes and small farms.

Sierra College is a public community college in Rocklin, California. It is part of the Sierra Joint Community College District, a district that covers over 3,200 square miles (8,300 km2), serves Placer, Nevada and parts of El Dorado and Sacramento counties.

Hidden Valley (formerly, Union House) is a housing development in an unincorporated area of Placer County, California, adjacent to Granite Bay. Hidden Valley is located 4.25 miles (6.8 km) east-southeast of Rocklin. It lies at an elevation of 436 feet (133 m).Hidden Valley was established in 1950 and consists of semi-rural housing lots surrounding 180 acres of pasture and small lakes. It was originally planned as a retirement community, due to its rural setting, but it has since become a bedroom community for the Sacramento metropolitan area. It was once informally called the "Aerojet enclave" for the large number of executives of the aerospace company who resided in the area.

Rocklin High School is a public high school in Rocklin, California a northeastern suburb located near Sacramento, California. It is one of three high schools in Rocklin Unified School District.

The California Granite Company, at 5255 Pacific St. in Rocklin, California, dates from 1865. It was listed on the National Register of Historic Places in 2012.It is an extractive facility which has also been known as Capitol Granite Co., as Union Granite Co., and as Big Gun Mining Co..The listing included three contributing buildings, four contributing structures, and a contributing site, on 7.2 acres (2.9 ha).