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.

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

99 counties.

#	County
1	Johnson County	67.6%	29.9%
2	Polk County	54.3%	43.5%
3	Story County	53.7%	43.5%
4	Linn County	53.6%	43.8%
5	Black Hawk County	49.5%	48.3%
6	Scott County	46.9%	50.7%
7	Dallas County	46.4%	51.1%
8	Jefferson County	44.8%	51.5%
9	Dubuque County	44.7%	53.2%
10	Winneshiek County	44.1%	53.2%
11	Cerro Gordo County	43.0%	54.5%
12	Des Moines County	41.4%	56.3%
13	Muscatine County	41.3%	56.1%
14	Marshall County	41.0%	56.4%
15	Poweshiek County	40.4%	57.2%
16	Clinton County	39.4%	58.1%
17	Pottawattamie County	39.0%	58.8%
18	Warren County	38.4%	58.8%
19	Cedar County	38.1%	59.7%
20	Boone County	38.0%	59.3%
21	Bremer County	38.0%	60.0%
22	Woodbury County	37.3%	60.0%
23	Washington County	36.8%	61.0%
24	Floyd County	36.1%	61.6%
25	Jones County	35.7%	61.7%
26	Tama County	35.3%	61.9%
27	Jasper County	35.2%	62.5%
28	Iowa County	35.0%	62.5%
29	Worth County	35.0%	62.9%
30	Buchanan County	34.7%	62.5%
31	Lee County	34.7%	62.2%
32	Winnebago County	33.7%	64.1%
33	Fayette County	33.6%	63.7%
34	Mitchell County	33.5%	64.5%
35	Webster County	33.5%	64.5%
36	Wapello County	33.3%	64.5%
37	Howard County	33.1%	64.6%
38	Jackson County	32.9%	65.2%
39	Benton County	32.5%	65.4%
40	Hamilton County	32.5%	65.5%
41	Buena Vista County	32.4%	65.3%
42	Greene County	32.3%	64.6%
43	Clayton County	31.9%	66.1%
44	Allamakee County	31.7%	65.5%
45	Henry County	31.0%	66.6%
46	Union County	31.0%	66.9%
47	Wright County	30.7%	66.8%
48	Chickasaw County	30.6%	67.5%
49	Marion County	30.2%	67.6%
50	Guthrie County	29.9%	67.3%

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