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California's 4th congressional district

U.S. House district for California

U.S. House district for California

FieldValue
stateCalifornia
district number4
image name{{switcher
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image captionInteractive map of district boundaries
representativeMike Thompson
partyDemocratic
residenceSt. Helena
population760,875
population year2024
median income$98,067
percent white51.3
percent hispanic31.4
percent black2.8
percent asian7.6
percent more than one race5.3
percent other race1.6
cpviD+17

| |From 2023 to 2027, starting with the 2022 elections | |From 2027, starting with the 2026 elections | percent more than one race = 5.3

California's 4th congressional district is a U.S. congressional district in California. The district is located in the northwestern part of the state, and includes all of Lake County and Napa County, most of Yolo County, and parts of Solano County and Sonoma County. Major cities in the district include Davis, Woodland, Napa, Vacaville, and most of Santa Rosa. The 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 in southwestern Placer County. It consisted of Alpine, Amador, Calaveras, El Dorado, Mariposa, and Tuolumne counties plus most of Placer County and portions of Fresno, Madera, and Nevada counties. The district was represented by Republican Tom McClintock.

Competitiveness

In 2006, Republicans had 48 percent of voter registrations, Democrats had 30 percent, and Libertarians 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 won the district in 2016 with 54% of the vote and won in 2020 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 Napa County, most of Yolo County, and parts of Solano County and Sonoma County. Major cities in the district include Davis, Woodland, Napa, Vacaville, and most of Santa Rosa. The new 4th district is solidly Democratic, and is represented by Mike Thompson.

Recent election results from statewide races

2023–2027 boundaries

YearOfficeResults
2008PresidentObama 67% - 32%
2010GovernorBrown 59% - 36%
Lt. GovernorNewsom 57% - 34%
Secretary of StateBowen 58% - 33%
Attorney GeneralHarris 51% - 39%
TreasurerLockyer 61% - 31%
ControllerChiang 61% - 29%
2012PresidentObama 66% - 34%
2014GovernorBrown 68% - 32%
2016PresidentClinton 64% - 29%
2018GovernorNewsom 65% - 35%
Attorney GeneralBecerra 66% - 34%
2020PresidentBiden 67% - 30%
2022Senate (Reg.)Padilla 66% - 34%
GovernorNewsom 63% - 37%
Lt. GovernorKounalakis 65% - 35%
Secretary of StateWeber 65% - 35%
Attorney GeneralBonta 64% - 36%
TreasurerMa 64% - 36%
ControllerCohen 61% - 39%
2024PresidentHarris 64% - 33%
Senate (Reg.)Schiff 64% - 36%

Composition

FIPS County CodeCountySeatPopulation
33LakeLakeport68,878
55NapaNapa133,216
95SolanoFairfield449,218
97SonomaSanta Rosa481,812
113YoloWoodland220,544

Under the 2020 redistricting, California's 4th congressional district encompasses Lake, 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, and Cotati; and the census-designated places Boyes Hot Spring, El Verano, Penngrove, Sonoma State University, Kenwood, Glen Ellen, Eldridge, Fetters Hot Springs-Agua Caliente, and Temelec. The area in Solano County includes the cities of Vacaville, Dixon, and Rio Vista; and the census-designated places Hartley 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
  • Vacaville – 102,386
  • Napa – 77,480
  • Davis – 66,850
  • Woodland – 61,032
  • Petaluma – 59,776
  • West Sacramento – 53,519
  • Rohnert Park – 44,390
  • American Canyon – 21,837
  • Dixon – 18,988
  • Clearlake – 16,685
  • Sonoma – 11,024
  • Rio Vista – 10,217

2,500 – 10,000 people

  • University of California, Davis – 8,525
  • Cotati – 7,584
  • Winters – 7,195
  • Hidden Valley Lake – 6,235
  • Boyes Hot Springs – 6,215
  • St. Helena – 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 – 3,108
  • Lucerne – 3,067
  • Esparto – 2,877
  • Nice – 2,731
  • Sonoma State University – 2,679
  • Angwin – 2,633
  • Clearlake Oaks – 2,551
  • Hartley – 2,510

List of members representing the district

MemberPartyDatesCong
ressElectoral historyCounties
District created March 4, 1873
[[File:ShermanOtisHoughton.jpg100px]]
Sherman Otis Houghton
(San Jose)RepublicannowrapMarch 4, 1873 –
March 3, 1875Redistricted from the and re-elected in 1872.
lost re-election.Fresno, Inyo, Kern, Los Angeles, Mariposa, Merced, Mono, Monterey, San Bernardino, San Diego, San Luis Obispo, San Mateo, Santa Barbara, Santa Clara, Santa Cruz, Stanislaus, Tulare, Ventura
[[File:PeterDWigginton.jpg100px]]
Peter D. Wigginton
(Merced)DemocraticnowrapMarch 4, 1875 –
March 3, 1877Elected in 1875.
Retired.
[[File:Romualdo Pacheco - Brady-Handy.jpg100px]]
Romualdo Pacheco
(San Luis Obispo)RepublicannowrapMarch 4, 1877 –
February 7, 1878Lost contested election.
[[File:PeterDWigginton.jpg100px]]
Peter D. Wigginton
(Merced)DemocraticnowrapFebruary 7, 1878 –
March 3, 1879Won contested election.
Retired.
[[File:Romualdo Pacheco - Brady-Handy.jpg100px]]
Romualdo Pacheco
(San Luis Obispo)RepublicannowrapMarch 4, 1879 –
March 3, 1883Elected in 1879.
Re-elected in 1880.
Retired.
[[File:Pleasant B. Tully circa 1891.jpg100px]]
Pleasant B. Tully
(Gilroy)DemocraticnowrapMarch 4, 1883 –
March 3, 1885Elected in 1882.
Retired.San Francisco
[[File:Morrow, W.W. Crop.jpg100px]]
William W. Morrow
(San Francisco)RepublicannowrapMarch 4, 1885 –
March 3, 1891Elected in 1884.
Re-elected in 1886.
Re-elected in 1888.
Retired.
[[File:Cutting, Hon. J.L. Trim.jpg100px]]
John T. Cutting
(San Francisco)RepublicannowrapMarch 4, 1891 –
March 3, 1893Elected in 1890.
Retired.
[[File:Maguire, Hon. J.G Trim Crop.jpg100px]]
James G. Maguire
(San Francisco)DemocraticnowrapMarch 4, 1893 –
March 3, 1899Elected in 1892.
Re-elected in 1894.
Re-elected in 1896.
Lost re-election.
[[File:Kahn, Hon. J. Trim.jpg100px]]
Julius Kahn
(San Francisco)RepublicannowrapMarch 4, 1899 –
March 3, 1903Elected in 1898.
Re-elected in 1900.
Lost re-election.
[[File:Edward J. Livernash.png100px]]
Edward J. Livernash
(San Francisco)Democratic/
Union LabornowrapMarch 4, 1903 –
March 3, 1905Elected in 1902.
Lost re-election.
[[File:KAHN, JULIUS. HONORABLE LCCN2016856284 Trim.jpg100px]]
Julius Kahn
(San Francisco)RepublicannowrapMarch 4, 1905 –
December 18, 1924Elected in 1904.
Re-elected in 1906.
Re-elected in 1908.
Re-elected in 1910.
Re-elected in 1912.
Re-elected in 1914.
Re-elected in 1916.
Re-elected in 1918.
Re-elected in 1920.
Re-elected in 1922.
Re-elected in 1924.
Died.
VacantnowrapDecember 18, 1924 –
February 17, 1925
[[File:KAHN, FLORENCE. HONORABLE LCCN2016862332 Trim.jpg100px]]
Florence Prag Kahn
(San Francisco)RepublicannowrapFebruary 17, 1925 –
January 3, 1937Elected to finish husband's term.
Re-elected in 1926.
Re-elected in 1928.
Re-elected in 1930.
Re-elected in 1932.
Re-elected in 1934.
Lost re-election.
[[File:Franck Havenner SF Examiner 1933 Edit.jpg100px]]
Franck R. Havenner
(San Francisco)ProgressivenowrapJanuary 3, 1937 –
January 3, 1939Elected in 1936.
Re-elected in 1938.
Lost re-election.
DemocraticnowrapJanuary 3, 1939 –
January 3, 1941
[[File:Thomas Rolph (California Congressman).jpg100px]]
Thomas Rolph
(San Francisco)RepublicannowrapJanuary 3, 1941 –
January 3, 1945Elected in 1940.
Re-elected in 1942.
Lost re-election.
[[File:Franck R. Havenner, 1950.jpg100px]]
Franck R. Havenner
(San Francisco)DemocraticnowrapJanuary 3, 1945 –
January 3, 1953Elected in 1944.
Re-elected in 1946.
Re-elected in 1948.
Re-elected in 1950.
Lost re-election.
[[File:William S. Mailliard.jpg100px]]
William S. Mailliard
(San Francisco)RepublicannowrapJanuary 3, 1953 –
January 3, 1963Elected in 1952.
Re-elected in 1954.
Re-elected in 1956.
Re-elected in 1958.
Re-elected in 1960.
Redistricted to the .
[[File:Robert L. Leggett.jpg100px]]
Robert Leggett
(Vallejo)DemocraticJanuary 3, 1963 –
January 3, 1979Elected in 1962.
Re-elected in 1964.
Re-elected in 1966.
Re-elected in 1968.
Re-elected in 1970.
Re-elected in 1972.
Re-elected in 1974.
Re-elected in 1976.
Retired.1963–1967
Colusa, Glenn, Lake, Solano, Sutter, Yolo, Yuba
1967–1973
Colusa, Glenn, Lake, Sacramento (outside the city), Solano, Sutter, Yolo, Yuba
1973–1975
Colusa, Glenn, Solano, southwestern Sacramento, Sutter, Yolo, Yuba
1975–1983
Colusa, western Sacramento, Solano, Sutter, Yolo
[[File:VicFazio.jpg100px]]
Vic Fazio
(West Sacramento)DemocraticJanuary 3, 1979 –
January 3, 1993Elected in 1978.
Re-elected in 1980.
Re-elected in 1982.
Re-elected in 1984.
Re-elected in 1986.
Re-elected in 1988.
Re-elected in 1990.
Redistricted to the .
1983–1993
Sacramento (outside the city), Solano, Yolo
[[File:JohnDoolittle.jpg100px]]
John Doolittle
(Roseville)RepublicanJanuary 3, 1993 –
January 3, 2009Redistricted from the and re-elected in 1992.
Re-elected in 1994.
Re-elected in 1996.
Re-elected in 1998.
Re-elected in 2000.
Re-elected in 2002.
Re-elected in 2004.
Re-elected in 2006.
Retired.1993–2003
Alpine, Amador, Calaveras, El Dorado, Mono, Placer, northeastern Sacramento, Tuolumne
2003–2013
[[File:United States House of Representatives, California District 4.png300px]]
Eastern Butte, El Dorado, Lassen, Modoc, Nevada, Placer, Plumas, Sacramento (Orangevale), Sierra
[[File:Tom McClintock 113th Congress.jpg100px]]
Tom McClintock
(Elk Grove)RepublicanJanuary 3, 2009 –
January 3, 2023Elected in 2008.
Re-elected in 2010.
Re-elected in 2012.
Re-elected in 2014.
Re-elected in 2016.
Re-elected in 2018.
Re-elected in 2020.
Redistricted to the .
2013–2023
[[File:California US Congressional District 4 (since 2013).tif300px]]
Eastern central California including Lake Tahoe, Roseville, and Yosemite National Park
[[File:Mike Thompson, official portrait, 2021 (cropped).jpg100px]]
Mike Thompson
(St. Helena)DemocraticnowrapJanuary 3, 2023 –
presentRedistricted from the and re-elected in 2022.
Re-elected in 2024.2023–present
[[File:California's 4th congressional district (since 2023) (new version).svg300px]]
Lake, Napa, most of Yolo, parts of Solano and Sonoma

Election results for representatives

1872

1874

1876

1878

1880

1882

1884

1886

1888

1890

1892

1894

1896

1898

1900

1902

1904

1906

1908

1910

1912

1914

1916

1918

1920

1922

1924

1926

1928

1930

1932

1934

1936

1938

1940

1942

1944

1946

1948

1950

1952

1954

1956

1958

1960

1962

1964

1966

1968

1970

1972

1974

1976

1978

1980

1982

1984

1986

1988

1990

1992

1994

1996

1998

2000

2002

2004

2006

2008

2010

2012

2014

2016

2018

In 2018, six Democratic candidates filed statements of candidacy with the Federal Election Commission (FEC). They were, in alphabetical order by last name: Regina Bateson; Roza Calderon; Richard Martin; Robert Lawton; Jessica Morse ; and 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 and 2008, 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 2016, 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 (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, 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

References

  1. "My Congressional District".
  2. (April 3, 2025). "2025 Cook PVI℠: District Map and List (119th Congress)".
  3. (2022-01-04). "CA 2022 Congressional". [[Dave's Redistricting]].
  4. "Maps: Final Congressional Districts". Citizens Redistricting Commission.
  5. [https://archive.today/20070310212125/http://www.sacbee.com/content/opinion/story/14253547p-15069375c.html "Editorial: 4th Congressional District"], ''The Sacramento Bee'', May 10, 2006
  6. "2018 California's 4th Congressional District election".
  7. [https://ballotpedia.org/California%27s_4th_Congressional_District California's 4th Congressional District] Ballotpedia.
  8. "Dra 2020".
  9. (8 November 2022). "Supplement to Statement of Vote".
  10. (5 November 2024). "Supplement to Statement of Vote".
  11. "California FIPS Codes". National Weather Service.
  12. "JoinCalifornia - James J. Ayers".
  13. "1920 election results".
  14. "1922 election results".
  15. "1924 election results".
  16. "1926 election results".
  17. "1928 election results".
  18. "1930 election results".
  19. "1932 election results".
  20. "1934 election results".
  21. "1936 election results".
  22. "1938 election results".
  23. "1940 election results".
  24. "1942 election results".
  25. "1944 election results".
  26. "1946 election results".
  27. "1948 election results".
  28. "1950 election results".
  29. "1952 election results".
  30. "1954 election results".
  31. "1956 election results".
  32. "1958 election results".
  33. "1960 election results".
  34. "1962 election results".
  35. "1964 election results".
  36. "1966 election results".
  37. "1968 election results".
  38. "1970 election results".
  39. "1972 election results".
  40. "1974 election results".
  41. "1976 election results".
  42. "1978 election results".
  43. "1980 election results".
  44. "1982 election results".
  45. "1984 election results".
  46. "1986 election results".
  47. "1988 election results".
  48. "1990 election results".
  49. "1992 election results".
  50. "1994 election results".
  51. "1996 election results".
  52. "1998 election results".
  53. "2000 election results".
  54. [http://sos.ca.gov/elections/sov/2002_general/congress.pdf 2002 general election results] {{webarchive. link. (February 3, 2009)
  55. [http://sos.ca.gov/elections/sov/2004_general/us%20reps%20all%20formatted.pdf 2004 general election results] {{webarchive. link. (August 21, 2008)
  56. [http://sos.ca.gov/elections/sov/2006_general/congress.pdf 2006 general election results] {{webarchive. link. (November 27, 2008)
  57. "Election Results - November 4, 2008 - California Secretary of State".
  58. "Federal Election Commission, Registered Candidates in California's Fourth Congressional District". Federal Election Commission.
  59. "Rochelle Wilcox".
  60. link
  61. Johnson, Doug. (April 8, 2017). "Although Tough on Trump, McClintock Faces Backlash at Another Town Hall". [[KTXL]].
  62. "I am thrilled & grateful to be endorsed by Charlie Brown, 2006 & 2008 Congressional Candidate for #CA04. From Charlie: "Jessica has the knowledge & experience to best represent the people in the 4th Congressional District." To read his full statement".
  63. Morse, Jessica. (January 11, 2018). "We are so grateful to have the support of community leaders, such as Dr. Bob Derlet - the 2016 Democratic candidate for #CA04! "I am behind Jessica because she is a fighter. She will stand up for the people of this district & not back down." Thank you, Dr. Derlet! #JessWeCanpic.twitter.com/e5tv0OC6bk".
  64. "PAGE BY PAGE REPORT DISPLAY FOR 201801199090468752 (Page 1 of 1)".
  65. "Gold Country News {{pipe".
  66. (November 2023). "California Democratic Party Rules Committee Agenda and Packet".
  67. Cadei, Emily. (February 20, 2018). "Tom McClintock rival Morse is stretches résumé".
  68. (24 March 2018). "Secretary of State Padilla Responds".
  69. Padilla, Alex. (March 29, 2018). "California Certified List of Candidates".
  70. Anderson, Bryan. (September 5, 2018). "ONCE AGAIN, MORSE DENIED 'NATIONAL SECURITY' BALLOT DESIGNATION".
  71. "2018 California's 4th Congressional District election".
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