San Luis Obispo County, California

2024 results by precinct

137 precincts · 150,812 votes cast

Harris · D+11

Harris +50

Trump +50

Real precinct boundaries. Hover for vote totals.

38 presidential elections

Year	Won	Margin	Democratic	Republican	Total
2024	D	+10.9%	81,314	64,932	150,812
2020	D	+13.1%	88,310	67,436	159,714
2016	D	+8.0%	67,107	56,164	137,202
2012	D	+1.0%	61,258	59,967	125,966
2008	D	+5.3%	68,176	61,055	133,155
2004	R	−7.2%	58,742	67,995	129,050
2000	R	−11.3%	44,526	56,859	108,886
1996	R	−6.3%	40,395	46,733	100,500
1992	D	+3.6%	40,136	36,384	104,619
1988	R	−13.1%	35,667	46,613	83,467
1984	R	−28.7%	26,946	49,035	76,950
1980	R	−26.1%	20,508	38,631	69,527
1976	R	−5.3%	24,926	27,785	54,298
1972	R	−15.3%	20,779	28,566	51,033
1968	R	−9.5%	15,828	19,420	37,881
1964	D	+19.8%	22,252	14,906	37,186
1960	R	−8.7%	14,975	17,862	33,055
1956	R	−17.4%	11,407	16,223	27,748
1952	R	−31.0%	8,761	16,733	25,691
1948	R	−11.3%	8,135	10,325	19,304
1944	D	+1.7%	8,068	7,793	15,936
1940	D	+8.1%	8,499	7,204	15,920
1936	D	+23.8%	7,889	4,812	12,906
1932	D	+37.2%	7,933	3,449	12,062
1928	R	−23.4%	3,336	5,425	8,920
1924	R	−39.6%	731	3,804	7,761
1920	R	−37.4%	1,606	4,123	6,725
1916	D	+9.6%	3,539	2,854	7,099
1912	D	+40.5%	2,248	0	5,553
1908	R	−15.8%	1,381	2,008	3,956
1904	R	−23.1%	1,167	2,015	3,667
1900	D	+4.4%	1,713	1,564	3,414
1896	D	+10.1%	2,056	1,671	3,820
1892	R	−6.2%	1,199	1,433	3,761
1888	R	−3.1%	1,585	1,689	3,400
1884	R	−6.8%	1,069	1,233	2,397
1880	R	−5.8%	729	830	1,736
1876	D	+10.0%	944	772	1,716

Demographics

Race, ethnicity, and ancestry

Click any group to see the ancestries typically reported within it.

American

100.0%

African American

1.0%

Multiple ancestry combinations reported; no single grouping above 1%.

American Indian, Alaska Native, Native Hawaiian, and Pacific Islander combined.

Source · American Community Survey 5-year estimates, 2024 release. Ancestry is a self-reported, multiple-response item; ancestry percentages do not sum to the parent race percentage.

Age distribution by sex

Median age: 40.4 in this county, 39.1 nationally

Male

Age

Female

1.1%

85+

1.3%

3.0%

75–84

3.7%

6.2%

65–74

6.9%

6.0%

55–64

6.4%

5.4%

45–54

5.0%

6.1%

35–44

5.6%

5.8%

25–34

5.2%

8.0%

18–24

6.9%

6.7%

5–17

6.4%

2.2%

Source · American Community Survey 5-year estimates, 2024 release.

Median household income

2024 inflation-adjusted dollars

$97,446

San Luis Obispo County ranks in the top 5% of US counties.

San Luis Obispo County$97,446

California$99,122

United States$80,734

Source · American Community Survey 5-year estimates, 2024 release.

Poverty rate

All persons below federal poverty line

12.9%

Children face moderate poverty.

Children under 1818.0%

Working age (18–64)100.0%

Seniors (65+)18.0%

Source · American Community Survey 5-year estimates, 2024 release.

Language at home

Population aged 5 and older

0.0%

speak English only

Source · ACS 5-year estimates, 2024.

Religious adherents

Adherents per capita by tradition

Catholic & Orthodox

20.3%

Other Christian

11.2%

Pentecostal & Holiness

2.9%

Mainline Protestant

1.8%

Non-Christian

1.4%

Baptist

0.5%

Methodist

0.5%

Source · 2020 US Religion Census. Remaining 61.4% of residents not counted as adherents by any reporting body.

Home to Cal Poly San Luis Obispo, the county's electorate skews younger and more educated than its Central Coast neighbors, a demographic mix that has steadily widened its Democratic presidential margin over the past two decades.

The county's recent history is a story of close margins. The Democratic margin reached forty points in 1912; the Republican margin reached forty points in 1924. Most other elections have been decided by single-digit points.

San Luis Obispo County's demographics — a population of 281,555, a 69% non-Hispanic-white share, a median household income of $97,446 — situate the county close to national averages on several dimensions. The county's voting pattern over the last decade is most similar to that of Larimer County and Jefferson County.

Most similar counties

San Luis Obispo County delivered a near-tie in 2024.