California's 4th congressional district is a U.S. congressional district in

California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...

. The district is located in the northwestern part of the state, and includes all of Lake County and

Napa County Napa County () is a County (United States), county north of San Pablo Bay located in the Northern California, northern portion of the U.S. state of California. As of the 2020 United States census, the population was 138,019. The county seat i ...

, most of Yolo County, and parts of Solano County and

Sonoma County Sonoma County ( ) is a county located in the U.S. state of California. As of the 2020 United States census, its population was 488,863. Its seat of government and largest city is Santa Rosa. Sonoma County comprises the Santa Rosa-Petaluma ...

. Major cities in the district include Davis,

Woodland A woodland () is, in the broad sense, land covered with woody plants (trees and shrubs), or in a narrow sense, synonymous with wood (or in the U.S., the '' plurale tantum'' woods), a low-density forest forming open habitats with plenty of sunli ...

, Napa,

Vacaville Vacaville is a city located in Solano County, California, United States. It is located from Sacramento, California, Sacramento and from San Francisco, it is on the edge of the Sacramento Valley in Northern California. The city was founded in ...

, and most of Santa Rosa. The new 4th district is solidly Democratic, and is represented by Mike Thompson. From 2013 to 2023, the district encompassed the Sierras from Truckee to the Sequoia National Forest, as well as a largely suburban area on the edge of the

Sacramento Valley The Sacramento Valley is the area of the Central Valley of the U.S. state of California that lies north of the Sacramento–San Joaquin River Delta and is drained by the Sacramento River. It encompasses all or parts of ten Northern California ...

in southwestern Placer County. It consisted of Alpine, Amador, Calaveras,

El Dorado El Dorado () is a mythical city of gold supposedly located somewhere in South America. The king of this city was said to be so rich that he would cover himself from head to foot in gold dust – either daily or on certain ceremonial occasions � ...

, Mariposa, and Tuolumne counties plus most of Placer County and portions of

Fresno Fresno (; ) is a city in the San Joaquin Valley of California, United States. It is the county seat of Fresno County, California, Fresno County and the largest city in the greater Central Valley (California), Central Valley region. It covers a ...

, Madera, and

Nevada Nevada ( ; ) is a landlocked state in the Western United States. It borders Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, and Utah to the east. Nevada is the seventh-most extensive, th ...

counties. The district was represented by Republican

Tom McClintock Thomas Miller McClintock II (born July 10, 1956) is an American politician serving as the U.S. representative for since 2009 (known as the 4th congressional district until 2023). His district stretches from the Sacramento suburbs to the out ...

Competitiveness

In 2006, Republicans had 48 percent of voter registrations, Democrats had 30 percent, and

Libertarians Libertarianism (from ; or from ) is a political philosophy that holds freedom, personal sovereignty, and liberty as primary values. Many libertarians believe that the concept of freedom is in accord with the Non-Aggression Principle, according ...

had roughly 5 percent. A Democratic congressional candidate nearly won the district in 2008, losing by only half a percentage point and less than 1,600 votes, indicating that the district was much more competitive than it appeared to be. New district boundaries for the 2012 elections shifted the population center to the south and east. Registered Democrats and Independents/Decline to State voters in the new district area outnumber registered Republicans by 12%. However, Republicans, Independents/Decline to State, and small third parties outnumber Democrats well over a 2 to 1 ratio. There were 183,800 Republicans, 117,300 Democrats, and 97,200 others. In presidential elections,

Donald Trump Donald John Trump (born June 14, 1946) is an American politician, media personality, and businessman who is the 47th president of the United States. A member of the Republican Party (United States), Republican Party, he served as the 45 ...

won the district in

2016 2016 was designated as: * International Year of Pulses by the sixty-eighth session of the United Nations General Assembly. * International Year of Global Understanding (IYGU) by the International Council for Science (ICSU), the Internationa ...

with 54% of the vote and won in

2020 The year 2020 was heavily defined by the COVID-19 pandemic, which led to global Social impact of the COVID-19 pandemic, social and Economic impact of the COVID-19 pandemic, economic disruption, mass cancellations and postponements of even ...

with 53.7% of the vote. In the 2018 and 2020 elections, the Republican candidate won over 53% of the vote. In the 2020 redistricting, the district was shifted again to the San Francisco Bay Area. It includes all of Lake County and

, most of Yolo County, and parts of Solano County and

. Major cities in the district include Davis,

, Napa,

, and most of Santa Rosa. The new 4th district is solidly Democratic, and is represented by Mike Thompson.

Recent election results from statewide races

Composition

Under the 2020 redistricting, California's 4th congressional district encompasses

Lake A lake is often a naturally occurring, relatively large and fixed body of water on or near the Earth's surface. It is localized in a basin or interconnected basins surrounded by dry land. Lakes lie completely on land and are separate from ...

, Napa, and Yolo Counties, and parts of Sonoma and Solano Counties. The area in Sonoma County includes the cities of Santa Rosa, Rohnert Park, Sonoma,

Petaluma Petaluma is a city in Sonoma County, California, United States, located in the North Bay region of the San Francisco Bay Area. Its population was 59,776 according to the 2020 census. Petaluma's name comes from the Miwok village named ''Péta ...

, and Cotati; and the census-designated places Boyes Hot Spring, El Verano, Penngrove,

Sonoma State University Sonoma State University (SSU, Sonoma State, or Sonoma) is a public university in Sonoma County, California, United States. It is part of the California State University system. Sonoma State offers 92 bachelor's degree programs, 19 master's de ...

, Kenwood, Glen Ellen, Eldridge, Fetters Hot Springs-Agua Caliente, and Temelec. The area in Solano County includes the cities of

, Dixon, and Rio Vista; and the census-designated places

Hartley Hartley may refer to: Places Australia *Hartley, New South Wales * Hartley, South Australia ** Electoral district of Hartley, a state electoral district Canada * Hartley Bay, British Columbia United Kingdom * Hartley, Cumbria * Hartley, P ...

and Allendale. Sonoma County is split between this district and the 2nd district. They are partitioned by Petaluma River, Highway 116, Redwood Highway, Robber Rd, Petersen Rd, Llano Rd, S Wright Rd, W College Ave, Jennings Ave, Administration Dr, Bicentennial Way, Cleveland Ave, Old Redwood Highway, Cross Creek Rd, Sonoma Highway, and Sonoma Creek. Solano County is split between this district and the 8th district. They are partitioned by Soda Springs Rd, Union Pacific, Alamo Dr, Leisure Town Rd, Hawkins Rd, Bay Area Exxextric, Shilo Rd, Collinsville Rd, and Montezuma Slough.

Cities and CDPs with 10,000 or more people

* Santa Rosa – 178,127 *

– 102,386 * Napa – 77,480 * Davis – 66,850 *

– 61,032 *

– 59,776 *

West Sacramento West Sacramento (also known as West Sac) is a city in Yolo County, California, United States. The city is separated from Sacramento by the Sacramento River, which also separates Sacramento and Yolo counties. The population was 53,915 at the 2 ...

– 53,519 * Rohnert Park – 44,390 *

American Canyon American Canyon (previously known as Napa Junction) is a city located in southern Napa County, California, United States, northeast of San Francisco, part of the San Francisco Bay Area. The 2020 United States census, 2020 census reported the c ...

– 21,837 * Dixon – 18,988 * Clearlake – 16,685 * Sonoma – 11,024 * Rio Vista – 10,217

2,500 – 10,000 people

University of California, Davis The University of California, Davis (UC Davis, UCD, or Davis) is a Public university, public Land-grant university, land-grant research university in Davis, California, United States. It is the northernmost of the ten campuses of the University ...

– 8,525 * Cotati – 7,584 * Winters – 7,195 * Hidden Valley Lake – 6,235 * Boyes Hot Springs – 6,215 *

St. Helena Saint Helena (, ) is one of the three constituent parts of Saint Helena, Ascension and Tristan da Cunha, a remote British overseas territory. Saint Helena is a volcanic and tropical island, located in the South Atlantic Ocean, some 1,874 km ...

– 5,438 * Calistoga – 5,228 * Lakeport – 5,026 * Penngrove – 4,172 * Fetters Hot Springs-Agua Caliente – 4,144 * El Verano – 3,867 * Yountville – 3,436 * Kelseyville – 3,382 * Clearlake Riviera (Kelseyville Riviera) – 3,410 * North Lakeport – 3,314 *

Esparto Esparto, halfah grass, or esparto grass is a fiber produced from two species of perennial grasses of north Africa, Spain and Portugal. It is used for crafts, such as cords, basketry, and espadrilles. '' Stipa tenacissima'' and '' Lygeum spar ...

– 3,108 *

Lucerne Lucerne ( ) or Luzern ()Other languages: ; ; ; . is a city in central Switzerland, in the Languages of Switzerland, German-speaking portion of the country. Lucerne is the capital of the canton of Lucerne and part of the Lucerne (district), di ...

– 3,067 *

– 2,877 *

Nice Nice ( ; ) is a city in and the prefecture of the Alpes-Maritimes department in France. The Nice agglomeration extends far beyond the administrative city limits, with a population of nearly one million Sonoma State University Sonoma State University (SSU, Sonoma State, or Sonoma) is a public university in Sonoma County, California, United States. It is part of the California State University system. Sonoma State offers 92 bachelor's degree programs, 19 master's de ...

– 2,679 * Angwin – 2,633 * Clearlake Oaks – 2,551 *

– 2,510

List of members representing the district

Election results for representatives

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In 2018, six Democratic candidates filed statements of candidacy with the

Federal Election Commission The Federal Election Commission (FEC) is an independent agency of the United States government that enforces U.S. campaign finance laws and oversees U.S. federal elections. Created in 1974 through amendments to the Federal Election Campaign ...

(FEC). They were, in alphabetical order by last name
Regina BatesonRoza Calderon
Richard Martin; Robert Lawton
Jessica Morse
an
Rochelle Wilcox
Martin and Wilcox dropped out of the race, with Wilcox endorsing Morse in February. Retired Air Force Lieutenant Colonel Charlie Brown, who was the Democratic nominee for this seat in

2006 2006 was designated as the International Year of Deserts and Desertification. Events January * January 1– 4 – Russia temporarily cuts shipment of natural gas to Ukraine during a price dispute. * January 12 – A stampede during t ...

and

2008 2008 was designated as: *International Year of Languages *International Year of Planet Earth *International Year of the Potato *International Year of Sanitation The Great Recession, a worldwide recession which began in 2007, continued throu ...

, was "seriously considering" running in 2018, but decided in June 2017 against a third campaign. In January 2018, Brown endorsed Morse for the nomination. Bob Derlet, the Democratic nominee in

, also endorsed Morse in January. On the Republican side, McClintock had one challenger
Mitchell Kendrick White
who filed with the FEC in January. In February, the

California Democratic Party The California Democratic Party is the affiliate of the Democratic Party in the U.S. state of California. It is headquartered in Sacramento, the state capital. With 46.59% of the state's registered voters as of February 2024, the Democratic ...

(CDP) endorsed Jessica Morse in a contested nomination. Roza Calderon was able to successfully collect 322 CDP-credentialed delegate signatures needed to block the endorsement, in which Morse only received 44 delegate votes. However, CDP staff refused to accept the forms after it was alleged they closed doors early to prevent the submission. A petition was later filed with the Compliance Review Commission (CRC) by Calderon. The CRC voted to accept and count the signatures, ultimately disqualifying enough signatures to proceed with Morse's endorsement. California allows candidates to include their professional description under their names on the ballot. Regina Bateson challenged Morse's ballot designation title of "National Security Fellow" at the Sacramento Superior Court after months of controversy that Morse was "fluffing" her credentials. California's Secretary of State,

Alex Padilla Alejandro Padilla (born March 22, 1973) is an American politician serving as the Seniority in the United States Senate, senior United States Senate, United States senator from California, a seat he has held since 2021. A member of the Democrati ...

, struck down Morse's three ballot designations before Judge Gevercer ruled that she presented "no credible evidence" to use the ballot designation of "National Security Fellow". Instead, he held that this title would mislead the average person about her recent activities. In the official Certified Candidate List for the primary election, Morse's ballot designation was left blank. Under the California nonpartisan blanket ("jungle") primary system, only the two candidates with the most votes on June 5, regardless of party, went on to the general election on November 6. Two Republicans and four Democrats appeared on the primary ballot. Morse finished second, qualifying for the general election ballot, along with McClintock. For the November ballot, Morse was also denied "National Security" as her designation. In the November general election, McClintock held the district with an advantage of more than eight percentage points.

2020

2022

2024

References

External links

* GovTrack.us
California's 4th congressional district
* California Citizens Redistricting Commission
wedrawthelines.ca.gov 2012 final district maps
{{Coord, 38.3, -119.7, region:US-CA_type:adm2nd_dim:220km , display=title 04 Government of Lake County, California Government of Napa County, California Government of Solano County, California Government of Sonoma County, California Government of Yolo County, California Constituencies established in 1873 1873 establishments in California