United States Rankings Largest counties in the U.S. Counties ranked
The largest counties in the United States Los Angeles County, CA ranks first by residents on July 1, 2025 (9,694,934). The Census Bureau's July 1, 2025 county estimates.
Which U.S. counties have the most people? First to fifth: Los Angeles County, CA (9,694,934), Cook County, IL (5,194,625), Harris County, TX (5,045,026), Maricopa County, AZ (4,689,558) and San Diego County, CA (3,282,248).
The largest counties in the United States, by residents on July 1, 2025 (the first 100 of 3,144). Rank County Residents on July 1, 2025 Since 2020 1 Los Angeles County, CA 9,694,934 −3.2% 2 Cook County, IL 5,194,625 −1.6% 3 Harris County, TX 5,045,026 +6.7% 4 Maricopa County, AZ 4,689,558 +6.0% 5 San Diego County, CA 3,282,248 −0.5% 6 Orange County, CA 3,149,507 −1.2% 7 Miami-Dade County, FL 2,802,029 +3.7% 8 Dallas County, TX 2,661,397 +1.9% 9 Kings County, NY 2,653,963 −3.0% 10 Riverside County, CA 2,544,916 +5.2% 11 Clark County, NV 2,407,226 +6.2% 12 Queens County, NY 2,358,182 −2.0% 13 King County, WA 2,344,939 +3.3% 14 Tarrant County, TX 2,248,466 +6.5% 15 San Bernardino County, CA 2,224,091 +1.9% 16 Bexar County, TX 2,160,088 +7.5% 17 Broward County, FL 2,013,317 +3.5% 18 Santa Clara County, CA 1,914,391 −1.1% 19 Wayne County, MI 1,769,038 −1.4% 20 Middlesex County, MA 1,669,979 +2.3% 21 New York County, NY 1,664,862 −1.8% 22 Alameda County, CA 1,636,630 −2.7% 23 Sacramento County, CA 1,618,460 +2.1% 24 Palm Beach County, FL 1,575,726 +5.6% 25 Philadelphia County, PA 1,574,281 −1.8% 26 Hillsborough County, FL 1,574,115 +7.8% 27 Suffolk County, NY 1,546,090 +1.3% 28 Orange County, FL 1,528,002 +6.9% 29 Bronx County, NY 1,406,332 −4.5% 30 Nassau County, NY 1,398,939 +0.2% 31 Travis County, TX 1,389,670 +7.7% 32 Franklin County, OH 1,361,536 +2.9% 33 Collin County, TX 1,297,179 +21.7% 34 Oakland County, MI 1,288,337 +1.1% 35 Hennepin County, MN 1,284,784 +0.3% 36 Wake County, NC 1,257,235 +11.3% 37 Mecklenburg County, NC 1,233,383 +10.6% 38 Cuyahoga County, OH 1,232,925 −2.5% 39 Allegheny County, PA 1,225,035 −2.0% 40 Salt Lake County, UT 1,220,916 +3.0% 41 Contra Costa County, CA 1,170,070 +0.3% 42 Fairfax County, VA 1,167,873 +1.5% 43 Fulton County, GA 1,098,791 +3.0% 44 Pima County, AZ 1,074,685 +3.0% 45 Montgomery County, MD 1,074,582 +1.2% 46 Denton County, TX 1,069,346 +18.0% 47 Duval County, FL 1,062,963 +6.8% 48 Fresno County, CA 1,035,456 +2.7% 49 Gwinnett County, GA 1,018,099 +6.3% 50 Westchester County, NY 1,015,743 +1.1% 51 Capitol Planning Region, CT 994,115 +1.7% 52 Marion County, IN 992,196 +1.5% 53 St. Louis County, MO 990,911 −1.4% 54 Honolulu County, HI 988,703 −2.7% 55 Bergen County, NJ 977,026 +2.2% 56 Fort Bend County, TX 975,191 +18.3% 57 Prince George's County, MD 970,374 +0.3% 58 Pinellas County, FL 948,563 −1.1% 59 Erie County, NY 946,741 −0.8% 60 Pierce County, WA 946,288 +2.7% 61 DuPage County, IL 934,298 +0.1% 62 Kern County, CA 927,068 +2.0% 63 Milwaukee County, WI 924,216 −1.6% 64 Hidalgo County, TX 921,549 +5.8% 65 Shelby County, TN 910,226 −2.1% 66 Essex County, NJ 896,379 +3.9% 67 Worcester County, MA 888,502 +3.1% 68 Macomb County, MI 886,221 +0.6% 69 Middlesex County, NJ 883,335 +2.3% 70 El Paso County, TX 877,858 +1.4% 71 Montgomery County, PA 877,643 +2.5% 72 Lee County, FL 875,607 +15.1% 73 Polk County, FL 874,790 +20.7% 74 Snohomish County, WA 870,656 +5.2% 75 Baltimore County, MD 847,650 −0.8% 76 Hamilton County, OH 838,418 +0.9% 77 Ventura County, CA 830,851 −1.6% 78 Essex County, MA 826,653 +2.1% 79 San Francisco County, CA 826,079 −6.0% 80 San Joaquin County, CA 823,815 +5.7% 81 Oklahoma County, OK 822,125 +3.2% 82 Multnomah County, OR 795,391 −2.5% 83 Jefferson County, KY 795,222 +1.6% 84 Cobb County, GA 793,345 +3.6% 85 Suffolk County, MA 791,891 −1.1% 86 Montgomery County, TX 781,194 +25.9% 87 DeKalb County, GA 774,394 +1.3% 88 Utah County, UT 759,859 +15.2% 89 El Paso County, CO 757,040 +3.5% 90 Williamson County, TX 752,827 +23.6% 91 Monroe County, NY 750,506 −1.2% 92 Davidson County, TN 745,904 +4.2% 93 San Mateo County, CA 743,568 −2.7% 94 Denver County, CO 740,613 +3.5% 95 Norfolk County, MA 739,749 +1.9% 96 Hudson County, NJ 735,033 +1.4% 97 Jackson County, MO 732,994 +2.2% 98 Lake County, IL 719,339 +0.7% 99 Will County, IL 712,253 +2.1% 100 Tulsa County, OK 698,782 +4.4%
Source: Census Bureau population estimates, Vintage 2025 (CO-EST2025) · Census Bureau source
How is this ranking made? One figure is read for each county: the residents on July 1, 2025. Equal figures share a rank. A ranking measures one number; it is not a judgment of a place. The rules are on the methodology page (how a survey figure's reliability is judged), and every ranking is on the rankings page.
Source: PlainCities ranking method applied to the Census Bureau population estimates, Vintage 2025 (CO-EST2025) · How ranks are computed