Growth data › Rankings › Largest counties by population What are the largest counties in the U.S.?
Los Angeles County, CA is the largest county in the U.S., with 9,694,934 residents in 2025 (Census PEP). Cook County, IL (5,194,625) and Harris County, TX (5,045,026) come next.
Data as of 2025 · updated November 5, 2026
Top 100 U.S. counties by population U.S. counties ranked by population Rank County Residents 2025 Change 2020–25 1 Los Angeles County, CA 9,694,934 −3.0% 2 Cook County, IL 5,194,625 −1.3% 3 Harris County, TX 5,045,026 +6.6% 4 Maricopa County, AZ 4,689,558 +5.5% 5 San Diego County, CA 3,282,248 −0.6% 6 Orange County, CA 3,149,507 −1.2% 7 Miami-Dade County, FL 2,802,029 +4.0% 8 Dallas County, TX 2,661,397 +1.9% 9 Kings County, NY 2,653,963 −2.5% 10 Riverside County, CA 2,544,916 +5.0% 11 Clark County, NV 2,407,226 +5.8% 12 Queens County, NY 2,358,182 −1.1% 13 King County, WA 2,344,939 +3.1% 14 Tarrant County, TX 2,248,466 +6.3% 15 San Bernardino County, CA 2,224,091 +1.9% 16 Bexar County, TX 2,160,088 +7.2% 17 Broward County, FL 2,013,317 +3.6% 18 Santa Clara County, CA 1,914,391 −0.9% 19 Wayne County, MI 1,769,038 −1.2% 20 Middlesex County, MA 1,669,979 +2.8% 21 New York County, NY 1,664,862 −1.3% 22 Alameda County, CA 1,636,630 −2.6% 23 Sacramento County, CA 1,618,460 +2.0% 24 Palm Beach County, FL 1,575,726 +5.5% 25 Philadelphia County, PA 1,574,281 −1.7% 26 Hillsborough County, FL 1,574,115 +7.4% 27 Suffolk County, NY 1,546,090 +1.6% 28 Orange County, FL 1,528,002 +6.7% 29 Bronx County, NY 1,406,332 −3.8% 30 Nassau County, NY 1,398,939 +0.6% 31 Travis County, TX 1,389,670 +7.2% 32 Franklin County, OH 1,361,536 +2.8% 33 Collin County, TX 1,297,179 +20.6% 34 Oakland County, MI 1,288,337 +1.2% 35 Hennepin County, MN 1,284,784 +0.2% 36 Wake County, NC 1,257,235 +11.2% 37 Mecklenburg County, NC 1,233,383 +10.5% 38 Cuyahoga County, OH 1,232,925 −2.4% 39 Allegheny County, PA 1,225,035 −2.0% 40 Salt Lake County, UT 1,220,916 +2.9% 41 Contra Costa County, CA 1,170,070 +0.3% 42 Fairfax County, VA 1,167,873 +1.7% 43 Fulton County, GA 1,098,791 +2.7% 44 Pima County, AZ 1,074,685 +2.8% 45 Montgomery County, MD 1,074,582 +1.3% 46 Denton County, TX 1,069,346 +16.9% 47 Duval County, FL 1,062,963 +6.5% 48 Fresno County, CA 1,035,456 +2.6% 49 Gwinnett County, GA 1,018,099 +6.2% 50 Westchester County, NY 1,015,743 +1.4% 51 Capitol Planning Region, CT 994,115 +3.1% 52 Marion County, IN 992,196 +1.6% 53 St. Louis County, MO 990,911 −1.2% 54 Honolulu County, HI 988,703 −2.3% 55 Bergen County, NJ 977,026 +2.4% 56 Fort Bend County, TX 975,191 +17.4% 57 Prince George's County, MD 970,374 +0.5% 58 Pinellas County, FL 948,563 −1.2% 59 Erie County, NY 946,741 −0.6% 60 Pierce County, WA 946,288 +2.5% 61 DuPage County, IL 934,298 +0.3% 62 Kern County, CA 927,068 +2.3% 63 Milwaukee County, WI 924,216 −1.5% 64 Hidalgo County, TX 921,549 +5.6% 65 Shelby County, TN 910,226 −2.1% 66 Essex County, NJ 896,379 +4.2% 67 Worcester County, MA 888,502 +3.7% 68 Macomb County, MI 886,221 +0.7% 69 Middlesex County, NJ 883,335 +2.6% 70 El Paso County, TX 877,858 +1.3% 71 Montgomery County, PA 877,643 +2.4% 72 Lee County, FL 875,607 +14.4% 73 Polk County, FL 874,790 +19.8% 74 Snohomish County, WA 870,656 +4.9% 75 Baltimore County, MD 847,650 −0.7% 76 Hamilton County, OH 838,418 +1.0% 77 Ventura County, CA 830,851 −1.5% 78 Essex County, MA 826,653 +2.3% 79 San Francisco County, CA 826,079 −5.6% 80 San Joaquin County, CA 823,815 +5.5% 81 Oklahoma County, OK 822,125 +3.0% 82 Multnomah County, OR 795,391 −2.6% 83 Jefferson County, KY 795,222 +1.6% 84 Cobb County, GA 793,345 +3.5% 85 Suffolk County, MA 791,891 +0.1% 86 Montgomery County, TX 781,194 +24.9% 87 DeKalb County, GA 774,394 +1.3% 88 Utah County, UT 759,859 +14.5% 89 El Paso County, CO 757,040 +3.2% 90 Williamson County, TX 752,827 +22.3% 91 Monroe County, NY 750,506 −1.0% 92 Davidson County, TN 745,904 +4.2% 93 San Mateo County, CA 743,568 −2.5% 94 Denver County, CO 740,613 +3.2% 95 Norfolk County, MA 739,749 +2.2% 96 Hudson County, NJ 735,033 +1.8% 97 Jackson County, MO 732,994 +2.1% 98 Lake County, IL 719,339 +0.8% 99 Will County, IL 712,253 +2.2% 100 Tulsa County, OK 698,782 +4.2%
Get the report for any U.S. county — $99 The County Growth and Demographics Report for any county as a PDF, from federal data: population and migration, housing and rents, permits, private employers and jobs, unemployment, ranks in the state and the country, and neighbouring counties, with a source next to every number. Pay once, no subscription.
Every purchase also includes a CSV of every table in the report, ready for a spreadsheet.
Not useful? Email us within 14 days for a full refund Sold by Simply Stats LLC (NC) Secure Stripe checkout (Apple Pay/Google Pay) Instant PDF download PDF + CSV of every table Refund terms: Terms . · How we compute every number
Questions What is the largest county in the U.S.? Los Angeles County, CA is the largest county in the U.S., with 9,694,934 residents in 2025 (Census PEP). Cook County, IL (5,194,625) and Harris County, TX (5,045,026) come next.
How is this ranking calculated? The Census Bureau's July 1 resident population estimates for 2025, largest first, with the change since 2020. Counties with fewer than 1,000 residents are not ranked. Areas without an estimate for the same year as the others are not ranked.
More rankings for the U.S. Largest counties by population in other states