The United States is home to many of the largest and most dynamic counties, where millions of residents contribute to the nation’s cultural and economic fabric. From major metropolitan centers like Los Angeles County, California, with nearly 10 million people, to Suffolk County, New York, with over 1.5 million, these regions reflect the country’s urban expansion and development. This list highlights the top 25 counties by population, offering a window into the communities that play a pivotal role in shaping America’s future.
| Rank | County, State | Total Population |
|---|---|---|
| 1 | Los Angeles County, CA | 9,936,690 |
| 2 | Cook County, IL | 5,225,367 |
| 3 | Harris County, TX | 4,726,177 |
| 4 | Maricopa County, AZ | 4,430,871 |
| 5 | San Diego County, CA | 3,289,701 |
Complete List of Counties with the Highest Population
Population size is a key factor that shapes the identity and influence of a county. From vibrant urban centers to sprawling suburban regions, the most populous counties in the United States highlight where people live, work, and thrive. Below is a closer look at the top 25 counties by population, offering insight into the areas that drive much of the country’s economic, cultural, and social activity.
1. Los Angeles County, California
- Total Population: 9,936,690
- Median Home Value: $732,200
2. Cook County, Illinois
- Total Population: 5,225,367
- Median Home Value: $293,700
3. Harris County, Texas
- Total Population: 4,726,177
- Median Home Value: $235,300
4. Maricopa County, Arizona
- Total Population: 4,430,871
- Median Home Value: $371,400
5. San Diego County, California
- Total Population: 3,289,701
- Median Home Value: $725,200
6. Orange County, California
- Total Population: 3,175,227
- Median Home Value: $862,900
7. Miami-Dade County, Florida
- Total Population: 2,688,237
- Median Home Value: $387,000
8. Kings County, New York
- Total Population: 2,679,620
- Median Home Value: $865,300
9. Dallas County, Texas
- Total Population: 2,604,053
- Median Home Value: $252,200
10. Riverside County, California
- Total Population: 2,429,487
- Median Home Value: $462,900
11. Queens County, New York
- Total Population: 2,360,826
- Median Home Value: $677,700
12. Clark County, Nevada
- Total Population: 2,265,926
- Median Home Value: $368,800
13. King County, Washington
- Total Population: 2,254,371
- Median Home Value: $761,500
14. San Bernardino County, California
- Total Population: 2,180,563
- Median Home Value: $438,000
15. Tarrant County, Texas
- Total Population: 2,113,854
- Median Home Value: $269,400
16. Bexar County, Texas
- Total Population: 2,014,059
- Median Home Value: $222,300
17. Broward County, Florida
- Total Population: 1,940,907
- Median Home Value: $348,600
18. Santa Clara County, California
- Total Population: 1,916,831
- Median Home Value: $1,316,800
19. Wayne County, Michigan
- Total Population: 1,781,641
- Median Home Value: $158,600
20. Alameda County, California
- Total Population: 1,663,823
- Median Home Value: $999,200
21. New York County, New York
- Total Population: 1,645,867
- Median Home Value: $1,104,000
22. Middlesex County, Massachusetts
- Total Population: 1,623,109
- Median Home Value: $654,300
23. Philadelphia County, Pennsylvania
- Total Population: 1,593,208
- Median Home Value: $215,500
24. Sacramento County, California
- Total Population: 1,579,211
- Median Home Value: $465,900
25. Suffolk County, New York
- Total Population: 1,524,486
- Median Home Value: $490,800
