Largest counties by population
Rank US counties and county equivalents by resident population, not land area.
U.S. Census Bureau Population EstimatesPeriod: July 1, 2024–July 1, 2025 · Vintage 2025Retrieved 2026-10-05T08:10:35+00:00
July 1 resident population estimates from a single Census vintage. Counties are ranked by population, not land area. County equivalents include independent cities and other Census county-equivalent areas.
Ranks are competition ranks computed across the full filtered set.
| Rank | Name | State | Population | Growth |
|---|---|---|---|---|
| 1 | Los Angeles County | California | 9,694,934 | -0.6% |
| 2 | Cook County | Illinois | 5,194,625 | 0.1% |
| 3 | Harris County | Texas | 5,045,026 | 1.0% |
| 4 | Maricopa County | Arizona | 4,689,558 | 0.8% |
| 5 | San Diego County | California | 3,282,248 | -0.2% |
| 6 | Orange County | California | 3,149,507 | -0.3% |
| 7 | Miami-Dade County | Florida | 2,802,029 | -0.4% |
| 8 | Dallas County | Texas | 2,661,397 | -0.1% |
| 9 | Kings County | New York | 2,653,963 | -0.2% |
| 10 | Riverside County | California | 2,544,916 | 0.6% |
| 11 | Clark County | Nevada | 2,407,226 | 0.9% |
| 12 | Queens County | New York | 2,358,182 | -0.4% |
| 13 | King County | Washington | 2,344,939 | 1.2% |
| 14 | Tarrant County | Texas | 2,248,466 | 0.8% |
| 15 | San Bernardino County | California | 2,224,091 | 0.2% |
| 16 | Bexar County | Texas | 2,160,088 | 1.0% |
| 17 | Broward County | Florida | 2,013,317 | 0.0% |
| 18 | Santa Clara County | California | 1,914,391 | 0.3% |
| 19 | Wayne County | Michigan | 1,769,038 | 0.2% |
| 20 | Middlesex County | Massachusetts | 1,669,979 | 0.4% |
| 21 | New York County | New York | 1,664,862 | 0.0% |
| 22 | Alameda County | California | 1,636,630 | 0.0% |
| 23 | Sacramento County | California | 1,618,460 | 0.5% |
| 24 | Palm Beach County | Florida | 1,575,726 | 0.1% |
| 25 | Philadelphia County | Pennsylvania | 1,574,281 | 0.1% |
| 26 | Hillsborough County | Florida | 1,574,115 | 0.2% |
| 27 | Suffolk County | New York | 1,546,090 | 0.2% |
| 28 | Orange County | Florida | 1,528,002 | 0.5% |
| 29 | Bronx County | New York | 1,406,332 | 0.0% |
| 30 | Nassau County | New York | 1,398,939 | 0.1% |
| 31 | Travis County | Texas | 1,389,670 | 1.1% |
| 32 | Franklin County | Ohio | 1,361,536 | 0.7% |
| 33 | Collin County | Texas | 1,297,179 | 3.4% |
| 34 | Oakland County | Michigan | 1,288,337 | 0.5% |
| 35 | Hennepin County | Minnesota | 1,284,784 | 0.6% |
| 36 | Wake County | North Carolina | 1,257,235 | 2.3% |
| 37 | Mecklenburg County | North Carolina | 1,233,383 | 2.2% |
| 38 | Cuyahoga County | Ohio | 1,232,925 | -0.1% |
| 39 | Allegheny County | Pennsylvania | 1,225,035 | -0.2% |
| 40 | Salt Lake County | Utah | 1,220,916 | 0.3% |
| 41 | Contra Costa County | California | 1,170,070 | 0.0% |
| 42 | Fairfax County | Virginia | 1,167,873 | 0.7% |
| 43 | Fulton County | Georgia | 1,098,791 | 0.8% |
| 44 | Pima County | Arizona | 1,074,685 | 0.1% |
| 45 | Montgomery County | Maryland | 1,074,582 | 0.1% |
| 46 | Denton County | Texas | 1,069,346 | 2.2% |
| 47 | Duval County | Florida | 1,062,963 | 0.8% |
| 48 | Fresno County | California | 1,035,456 | 0.2% |
| 49 | Gwinnett County | Georgia | 1,018,099 | 0.8% |
| 50 | Westchester County | New York | 1,015,743 | 0.7% |
3144 ranked entries.