Region of California
|Time zone||Pacific Standard Time|
|• Summer (DST)||Pacific Daylight Time|
|Area codes||530, 442/760, 909, 951|
Eastern California is a region defined as either the strip to the east of the crest of the Sierra Nevada or as the easternmost counties of California.[ citation needed ]
According to the 2010 census, the population of the eastern border counties of California was 5,129,384. However, 4,224,851 (82.4%) lived in San Bernardino and Riverside counties, which are very large and whose populations are concentrated near Los Angeles and Orange counties to the southwest.
This section possibly contains original research .(February 2020)
Eastern California's history differs significantly from that of the coastal regions and the Central Valley. Northeastern California is very sparsely populated (except for the area around Lake Tahoe): the three least-populated counties of California lie in the northeast.  The area tends to be politically conservative, much like the rest of the rural Western United States. However, the counties of San Bernardino and Riverside form the 13th-largest metropolitan area of the United States,   and El Dorado and Placer Counties are part of the Greater Sacramento area  and are culturally influenced by their respective metropolitan areas. Imperial County in the Southeast, though rural and agrarian, is heavily Democratic and has ties with the Mexicali Valley to the south.
Northeastern California has had strong ties to Nevada, with the exact boundary between the two states having once been a matter of dispute.  Residents of an area near Susanville, California tried to break away from the state in 1856, first by declaring themselves part of the Nataqua Territory  and then through annexation to Nevada. The two states further squabbled over ownership of Susanville in 1863. The town of Aurora, Nevada, was temporarily the county seat of both Mono County, California, and Esmeralda County, Nevada. Finally, the line between the two states was settled by a survey in 1892.  Over time, droughts and wildfires have increased in frequency and become less seasonal and more year-round, further straining the region's water security.   
There are many unique historical aspects of Eastern California including the Manzanar internment camp and the historical Carson and Colorado Railway.  
The easternmost counties of California are (from north to south):
Cities within this region include San Bernardino, Riverside, Ontario, Corona, Rancho Cucamonga, Roseville, Victorville, Temecula, Palm Springs, Lincoln, El Centro, Barstow, South Lake Tahoe, Susanville, Truckee, Grass Valley, Placerville, and Alturas.
The following incorporated places have a population of 50,000 or greater, according to the 2020 census: 
Because Eastern California is generally in the rain shadow of the Sierra Nevada or the Transverse Ranges, the climate is extremely dry and can be considered a desert. Indeed, the hottest and lowest area in North America lies in Death Valley, in the heart of Eastern California.
Geologically, Eastern California is mostly part of the Basin and Range Province, marked by crustal extension, with horsts and grabens. Volcanism is also evident in this region.
The majority of Eastern California experiences two seasons, a long, dry summer and a milder winter in which the rain is concentrated. Most higher elevations experience four distinct seasons. There are some areas where the weather is very diverse. The Sierra Nevada mountain range has larger amounts of snowfall, while the Imperial Valley has more arid conditions.  The Sierra Nevada's average temperature is around 47 °F (8 °C) and the Imperial Valley is on average 73 °F (23 °C). A record-breaking heat temperature was recorded in Death Valley, at 134 °F (57 °C) on July 10, 1913.  With its low and often sporadic rainfall, California is susceptible to drought, and in many parts of the state including Eastern California, there is very high fire danger and there have been several devastating wildfires. 
The northern counties of Eastern California are heavily timbered areas. The timber industry is a major contributor to the economy from sale of timber and forest products and the number of jobs that it provides. These timbered areas not only provide valuable income, but are also the main growing sector for the economy for recreation and tourism. In the Sierra Nevada National Forests they experience 50 million recreational visitor days per year.  When California became a state, it was one of the leading producers of these timber and forest products. Since then, it has held the third place for the top producer of softwoods since the 1940s. In California there were five counties that contributed to 55 percent of the wood harvested for the state. One of those counties, Plumas, is located in Eastern California. 
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, Inyo is the second-largest county by area in California, after San Bernardino County. Almost one-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 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 state's northernmost 48 counties, its main 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.
U.S. Route 395 is a U.S. Route in the western United States. The southern terminus of the route is in the Mojave Desert at Interstate 15 near Hesperia. The northern terminus is at the Canada–US border near Laurier, where the road becomes Highway 395 upon entering British Columbia, Canada. Before 1964, the route extended south to San Diego. I-15, I-215, and California State Route 163 replaced the stretch of 395 that ran from San Diego to Hesperia through Riverside and San Bernardino. "Old Highway 395" can be seen along or near I-15 in many locations before it branches off at Hesperia to head north. It has also been referred to as the "Three Flags Route."
The United States District Court for the Eastern District of California is a federal court in the Ninth Circuit.
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.
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 Modoc National Forest and passes near Antelope Mountain and Tule Lake. North of SR 299 near Canby, the 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.
Sierra Highway or El Camino Sierra is a road in Southern California, United States. El Camino Sierra refers to the full length of a trail formed in the 19th century, rebuilt as highways in the early 20th century, that ran from Los Angeles to Lake Tahoe following parts of modern State Route 14, U.S. Route 395 and State Route 89. Two portions of this road are currently signed as Sierra Highway. The first is an old alignment of SR 14/U.S. Route 6 from Los Angeles to Mojave. This road is also signed with the unusual designation of State Route 14U through the city of Santa Clarita. The second part signed as Sierra Highway is a portion of US 395 in Bishop.
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.
The California High School Speech Association, or CHSSA, is a speech and debate organization offered to all schools in the state of California. It is the governing body for local and state speech and debate competitions in California, with higher-level competition under the auspices of the National Forensic League and the National Catholic Forensic League. The league held its first championship tournament in 1958, and continues to hold championship tournaments every April.
Eastern California Museum
Eastern California exists, or so I'm told
eastern California shear zone
Eastern California Shear Zone