Inyo County is a county in the eastern central part of the U.S. state of California, located between the Sierra Nevada and the state of Nevada. In the 2020 census, the population was 19,016. The county seat is Independence. Inyo County is on the east side of the Sierra Nevada and southeast of Yosemite National Park in Central California. It contains the Owens River Valley; it is flanked to the west by the Sierra Nevada and to the east by the White Mountains and the Inyo Mountains. With an area of 10,192 square miles (26,400 km2), Inyo is the second-largest county by area in California, after San Bernardino County. Almost half of that area is within Death Valley National Park. However, with a population density of 1.8 people per square mile, it also has the second-lowest population density in California, after Alpine County.
Lassen County is a county located in the northeastern portion of the U.S. state of California. As of the 2020 census, the population was 32,730. The county seat and only incorporated city is Susanville. Lassen County comprises the Susanville, California, micropolitan statistical area. A former farming, mining, and lumber area, its economy now depends on employment at one federal and two state prisons; the former in Herlong and the latter two in Susanville. In 2007, half the adults in Susanville worked in one of the facilities.
Northern California is a geographic and cultural region that generally comprises the northern portion of the U.S. state of California, spanning the northernmost 48 of the state's 58 counties. Northern California in its largest definition is determined by dividing the state into two regions, the other being Southern California. The main northern population centers include the San Francisco Bay Area, the Greater Sacramento area, the Redding, California, area south of the Cascade Range, and the Metropolitan Fresno area. Northern California also contains redwood forests, along with most of the Sierra Nevada, including Yosemite Valley and part of Lake Tahoe, Mount Shasta, and most of the Central Valley, one of the world's most productive agricultural regions. Northern California is also home to Silicon Valley, the global headquarters for some of the most powerful tech and Internet-related companies in the world, including Meta, Apple, Google, and Nvidia.
U.S. Route 395, also known as U.S. Highway 395, is a north–south United States Numbered Highway that traverses the inland areas of the western states of California, Nevada, Oregon, and Washington. It travels for over 1,300 miles (2,100 km) from a junction in the Mojave Desert at Interstate 15 (I-15) in Hesperia to the Canada–U.S. border near Laurier, Washington. Major cities along its route include Carson City and Reno in Nevada; Kennewick and Pasco in Washington's Tri-Cities region; and Spokane, Washington. US 395 is an auxiliary route of US 95 but never intersects its parent route, which runs further east.
The Shasta Cascade region of California is located in the northeastern and north-central sections of the state bordering Oregon and Nevada, including far northern parts of the Central Valley and the Sierra Nevada mountain range.
The State Scenic Highway System in the U.S. state of California is a list of highways, mainly state highways, that have been designated by the California Department of Transportation (Caltrans) as scenic highways. They are marked by the state flower, a California poppy, inside either a rectangle for state-maintained highways or a pentagon for county highways.
Plumas National Forest is a 1,146,000-acre (4,640 km2) United States National Forest located at the northern terminus of the Sierra Nevada, in northern California. The Forest was named after its primary watershed, the Rio de las Plumas, or Feather River.
State Route 89 is a state highway in the U.S. state of California that travels in the north–south direction, serving as a major thoroughfare for many mountain communities in the Sierra Nevada and the Cascade Range. It starts from U.S. Route 395 near Topaz Lake, winding its way up to the 8,314-foot (2,534 m) Monitor Pass, down to the Carson River, and up again over the 7,740-foot (2,359 m) Luther Pass. From that point on, the route generally loses elevation on its way past Lake Tahoe, through Tahoe and Plumas National Forests until Lake Almanor. For roughly nine miles the route is then a part of State Route 36. The route then ascends to the 5,753-foot (1,754 m) Morgan Summit. After it enters Lassen Volcanic National Park it continues to gain elevation until it reaches its highest point in an unnamed pass in the middle of Lassen Peak and Bumpass Mountain. The road then descends and heads northwest, finally terminating at Interstate 5 at the foot of Mount Shasta at around 3,600 feet (1,100 m).
State Route 36 is an east–west state highway in the U.S. state of California that is routed from U.S. Route 101 in Humboldt County to U.S. Route 395 just east of Susanville in Lassen County. The highway passes through Red Bluff, the county seat of Tehama County, on the northern edge of the Sacramento Valley. The portion of SR 36 travelling past Lassen Volcanic National Park and Lake Almanor is part of the Volcanic Legacy Scenic Byway, a National Scenic Byway. Also, Route 36 between Alton and Susanville is a designated Blue Star Memorial Highway.
State Route 139 is a state highway in the U.S. state of California. Running from SR 36 in Susanville north to Oregon Route 39 at the Oregon state line, it forms part of the shortest route between Reno, Nevada, and Klamath Falls, Oregon. SR 139 cuts through much of Modoc National Forest and passes near Antelope Mountain and Tule Lake. North of SR 299 near Canby, SR 139 was built by the federal government and turned over to the state in about 1940; the remainder was built by a joint highway district of Lassen and Modoc Counties, completed in 1956, and given to the state in 1959.
Area code 530 is a telephone area code in the North American Numbering Plan (NANP) in northeastern and Northern California. It was created in 1997 in an area code split of 916.
The Nataqua Territory was a short-lived, unofficial territory of the United States. It consisted of a portion of what is now northeastern California and northwestern Nevada. Nataqua Territory was the first incarnation of the proposed "State of Jefferson". In 1849, the border between California and the Utah Territory was defined by geographical coordinates that were not surveyed. On April 26, 1856, local residents took advantage of this ambiguity and justified their resistance to tax collectors from Plumas County, California, by proclaiming themselves part of a new "Territory of Nataqua." The twenty men of the Susanville convention who announced the Nataqua Territory had defined a rectangle-shaped territory by latitude and longitude, which inadvertently did not include their own Honey Lake Valley but did encompass most of what soon became western Nevada, along with 600 unsuspecting inhabitants. The Territory of Nataqua was a frontier land club or claim association, designed to protect the property rights of individual settlers until regular government reached the area. The movement was led by Peter Lassen and Isaac Roop. Association with the Utah Territory was unpalatable to the residents due to anti-Mormonism.
Districts in California geographically divide the U.S. state into overlapping regions for political and administrative purposes.
U.S. Route 395 (US 395) is a United States Numbered Highway, stretching from Hesperia, California to the Canadian border in Laurier, Washington. The California portion of US 395 is a 557-mile (896 km) route which traverses from Interstate 15 (I-15) in Hesperia, north to the Oregon state line in Modoc County near Goose Lake. The route clips into Nevada, serving the cities Carson City and Reno, before returning to California.
The Sierra Nevada Conservancy is the largest conservancy in the U.S. state of California, and the largest state conservation effort of its kind in the nation.
The following outline is provided as an overview of and topical guide to the U.S. state of California:
There are 28 routes assigned to the "A" zone of the California Route Marker Program, which designates county routes in California. The "A" zone includes county highways in Lassen, Plumas, Shasta, Siskiyou, and Tehama counties.
