King County, Washington: Professional Migration

Washington · Presidential Elections 1892–2024

D+51.3

2024 Margin

R+1.4%

2020→2024 Swing

D since 1988

Voting Streak

2.3M

Population

King County, Washington voted D+51.3 for Kamala Harris in 2024, with Harris receiving 832,606 votes (73.65%). This represented a R+1.4% swing toward Republicans compared to 2020. The county has voted Democratic in every presidential election since 1988.

Quick Stats

2024 ResultD+51.3

2020→2024 SwingR+1.4%

Voting StreakD since 1988

Elections on Record34

Demographics

Population2,269,675

Median Age

37.2(US: 38.4)

College (BA+)

55.9%(US: 34.6%)

Median Income

$116,340(US: $78k)

White (non-Hisp)

54.3%(US: 57.5%)

Hispanic

10.8%(US: 18.6%)

Black

6.7%(US: 12.3%)

Asian

19.4%(US: 5.7%)

Homeownership

56.1%(US: 64.2%)

Poverty Rate

8.4%(US: 12.4%)

Veterans

4.7%(US: 6.4%)

Non-English (CVAP)

19.6%(US: 17.1%)

Community Profile

Religious Composition

Source: Religion Census 2020

EvangelicalStrongly R

15.6%(-0.9 vs US)

CatholicSwing vote

12.6%(-6.1 vs US)

Mainline ProtestantSuburban swing

3.3%(-1.9 vs US)

LDS/MormonHistorically R

2.0%

Black ProtestantStrongly D

0.8%(-1.4 vs US)

+ 1 more traditions

Age Distribution

Median:37.2 yrs(US: 38.5)

Under 18Future voters

19.8%↓

18-29Lean D, low turnout

8.0%↓

30-44Swing voters

26.7%↑

45-64Lean R, high turnout

31.8%↑

65+Lean R, highest turnout

13.8%↓

National average

Employment by Industry

Source: Census ACS

Professional ServicesVery high

22.0%

Retail Trade

12.0%

Education

8.2%

Manufacturing

8.0%

ConstructionBelow avg

5.1%

HealthcareVery low

4.1%

Political relevance:

Professional Services: College-educated baseHealthcare: ACA debates

Presidential Elections

Presidential Results

Year	Democrat	Republican	Margin	Swing
2024	73.7%(832,606)	22.3%(252,193)	D+51.3	R+1.4
2020	75.0%(907,310)	22.2%(269,167)	D+52.7	D+3.9
2016	69.8%(718,322)	21.0%(216,339)	D+48.8	D+8.5
2012	68.7%(668,004)	28.4%(275,700)	D+40.4	R+1.8
2008	70.3%(648,230)	28.2%(259,716)	D+42.1	D+10.9
2004	64.9%(580,378)	33.6%(301,043)	D+31.2	D+5.6
2000	60.0%(476,700)	34.4%(273,171)	D+25.6	D+0.7
1996	56.4%(417,846)	31.4%(232,811)	D+25.0	D+2.1
1992	50.2%(391,050)	27.4%(212,986)	D+22.9	D+13.8
1988	53.9%(349,663)	44.8%(290,574)	D+9.1	D+14.5

Source: Official state election returns via MIT Election Data + Science Lab

Senate Elections

Senate Results

Year	Democrat	Republican	Margin	Swing
2024	75.3%(828,204)	24.7%(271,832)	D+50.6	D+0.3
2022	75.0%(668,692)	24.7%(220,307)	D+50.3	D+2.0
2018	74.2%(708,654)	25.9%(247,071)	D+48.3	D+2.9
2016	72.7%(728,113)	27.3%(273,410)	D+45.4	D+0.9
2012	72.3%(683,067)	27.7%(262,034)	D+44.5	D+14.7
2010	64.9%(489,190)	35.1%(264,368)	D+29.8	R+6.5
2006	66.6%(419,898)	30.2%(190,678)	D+36.3	D+3.8
2004	65.2%(573,506)	32.7%(287,456)	D+32.5	D+12.9
2000	58.7%(459,605)	39.1%(306,251)	D+19.6	R+14.6
1998	67.1%(405,177)	32.9%(198,592)	D+34.2	D+29.9

Source: Official state election returns via MIT Election Data + Science Lab

Governor Elections

Governor Results

Year	Democrat	Republican	Margin	Swing
2024	71.6%(797,248)	28.2%(314,226)	D+43.4	R+5.1
2020	74.1%(887,374)	25.6%(307,022)	D+48.4	D+12.8
2016	67.7%(677,943)	32.1%(321,242)	D+35.6	D+10.9
2012	62.4%(590,879)	37.6%(356,713)	D+24.7	R+3.6
2008	64.2%(583,357)	35.8%(325,820)	D+28.3	D+10.7
2004	57.8%(506,194)	40.1%(351,306)	D+17.7	R+17.0
2000	66.5%(522,229)	31.8%(250,103)	D+34.6	D+0.6
1996	67.0%(490,284)	33.0%(241,134)	D+34.1	D+13.2
1992	60.4%(466,506)	39.6%(305,326)	D+20.9	R+18.9
1988	69.9%(453,572)	30.1%(195,378)	D+39.8	D+35.1

Source: Official state election returns via MIT Election Data + Science Lab

Primary Election History

Primary Results

Year	Party	Winner	Runner-up	Nominee?
2020	Dem	Joe Biden(38.3%)	Bernie Sanders(37.8%)	✓
2016	Dem	Bernie Sanders(67.3%)	Hillary Clinton(32.6%)	✗
2016	GOP	Donald Trump(70.8%)	John Kasich(15.4%)	✓
2008	Dem	Barack Obama(71.6%)	Hillary Clinton(27.5%)	✓