Which U.S. county has the most people?

Los Angeles County, California, with 9,808,667 people (Census Bureau, American Community Survey 2020–2024).

Which large county has the highest median household income?

Among the 620 counties of 100,000 people or more: Loudoun County, Virginia, $181,765 (American Community Survey 2020–2024).

Which large county has the highest share of people without health insurance?

Among counties of 100,000 or more: Hidalgo County, Texas, 28.2% (American Community Survey 2020–2024).

How does "places like mine" work?

Pick a place and the figures to compare on. Each figure is put on the same scale (how far a place is from the average, in standard deviations; money and population on a log scale), and the places with the smallest overall difference are listed. It's a comparison of published figures, nothing more.

Compare places on official figures

Every U.S. state, county and congressional district on the figures the Census Bureau, the Bureau of Labor Statistics and the FBI publish, and on certified election results since 2000 (past results): sort and filter them, chart any two figures against each other, or find the places most like yours. Every link keeps your view, so you can share exactly what you see.

Places

Figures

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California counties by Democratic share of the 2024 presidential vote, highest first

58 counties.

#	County
1	Marin County	80.6%	16.7%
2	San Francisco County	80.3%	15.5%
3	Santa Cruz County	75.3%	20.9%
4	Alameda County	74.6%	21.0%
5	San Mateo County	73.5%	23.2%
6	Sonoma County	71.4%	25.2%
7	Santa Clara County	68.1%	28.1%
8	Contra Costa County	67.3%	29.4%
9	Yolo County	66.3%	30.1%
10	Napa County	65.9%	31.1%
11	Alpine County	64.9%	32.9%
12	Los Angeles County	64.8%	31.9%
13	Monterey County	63.4%	33.6%
14	Humboldt County	62.0%	33.6%
15	Santa Barbara County	61.8%	35.1%
16	Mendocino County	61.3%	34.5%
17	Solano County	60.1%	37.1%
18	Mono County	58.1%	37.8%
19	Sacramento County	58.1%	38.4%
20	San Diego County	56.9%	40.1%
21	Ventura County	56.1%	41.0%
22	San Benito County	54.9%	42.3%
23	Nevada County	54.4%	42.1%
24	San Luis Obispo County	53.9%	43.1%
25	Orange County	49.7%	47.1%
26	Imperial County	48.3%	49.1%
27	Riverside County	48.0%	49.3%
28	San Joaquin County	48.0%	48.9%
29	Lake County	47.8%	49.2%
30	San Bernardino County	47.5%	49.7%
31	Inyo County	46.9%	49.9%
32	Butte County	46.8%	49.9%
33	Fresno County	46.5%	50.9%
34	Merced County	46.5%	50.9%
35	Placer County	44.3%	52.8%
36	Trinity County	43.4%	52.8%
37	Stanislaus County	43.2%	54.2%
38	El Dorado County	42.6%	54.6%
39	Del Norte County	40.4%	56.8%
40	Plumas County	39.9%	56.9%
41	Siskiyou County	38.8%	58.0%
42	Tulare County	38.5%	59.2%
43	Madera County	38.4%	59.2%
44	Kern County	38.2%	59.3%
45	Mariposa County	38.1%	59.2%
46	Tuolumne County	37.9%	59.7%
47	Kings County	37.4%	60.4%
48	Sierra County	36.5%	60.8%
49	Yuba County	35.7%	61.5%
50	Amador County	34.7%	62.6%

Where these figures come from

Census Bureau, American Community Survey 2020–2024 (5-year estimates): people, age, income, poverty, college degrees, home values, health insurance, housing costs, birthplace, veterans, race and Hispanic origin. Each is an estimate with a margin of error, wider for small counties.
Bureau of Labor Statistics, Local Area Unemployment Statistics: the unemployment rate for September 2026 (preliminary), not seasonally adjusted (the only way BLS publishes counties; states are shown the same way so they compare).
FBI: violent and property crimes reported to police per 100,000 residents. States: the FBI's estimates. Counties: the latest year every police agency in the county reported all 12 months, shown beside the figure, so years differ between counties. Sworn officers per 1,000 residents from the FBI's Law Enforcement Employees count.
Census of Governments 2022: local governments in each county: the county itself, cities and towns, townships, school districts and special districts.
Election results: each party's candidate's share of all votes cast, write-ins included. The presidential vote by state is the Federal Election Commission's compilation of each state's certified results (2004–2024; 2000 adds up the counties); by county, the MIT Election Data and Science Lab's County Presidential Election Returns 2000–2024, from official results (Alaska reports by state House district and Connecticut's figures are by its eight former counties, so Alaska's boroughs and Connecticut's planning regions have none). The 2024 U.S. House vote by district is from the same lab, on the districts as drawn in 2024. A district where only one party's candidate ran shows that candidate's share and none for the other. Every candidate and vote total →
Reading a comparison: these are published figures, shown as published. "Highest" and "lowest" describe the numbers, not how good a place is, and two figures that move together don't show that one causes the other.

Every figure is also on each place's own page. All sources · Methodology

Quick answers

Which U.S. county has the most people?: Los Angeles County, California, with 9,808,667 people (Census Bureau, American Community Survey 2020–2024).
Which large county has the highest median household income?: Among the 620 counties of 100,000 people or more: Loudoun County, Virginia, $181,765 (American Community Survey 2020–2024).
Which large county has the highest share of people without health insurance?: Among counties of 100,000 or more: Hidalgo County, Texas, 28.2% (American Community Survey 2020–2024).
How does "places like mine" work?: Pick a place and the figures to compare on. Each figure is put on the same scale (how far a place is from the average, in standard deviations; money and population on a log scale), and the places with the smallest overall difference are listed. It's a comparison of published figures, nothing more.

See something wrong on this page? Report a problem · Corrections