Top Ten Largest U.S. Counties by Population
Trying you hand at the US Largest Counties By Population, US County Grid, or the US Counties By State quizzes? These are some must-know counties and some facts about each.
1. Los Angeles County, CA – 9,663,345
Los Angeles County is the most populous county in the United States, home to nearly 10 million people. It encompasses a diverse range of cities, from the bustling metropolis of Los Angeles to beachside communities like Santa Monica. The county is a global hub for entertainment, with Hollywood at its heart, and features some of the most famous landmarks, including the Griffith Observatory and the Getty Center. With its massive population, Los Angeles County is a melting pot of cultures, languages, and traditions.
2. Cook County, IL – 5,087,072
Cook County, Illinois, is anchored by the city of Chicago, the third-largest city in the U.S. With over 5 million residents, Cook County is known for its historical architecture, cultural landmarks, and vibrant neighborhoods. From the Magnificent Mile to Millennium Park, the county boasts world-class museums, theaters, and restaurants. Its large population also supports a booming economy centered on finance, commerce, and technology.
3. Harris County, TX – 4,835,125
Harris County is home to the city of Houston, the fourth-largest city in the U.S. With nearly 5 million residents, it is a dynamic center for industries like energy, aerospace, and healthcare. The county’s cultural scene is vibrant, featuring the Houston Museum District and the Space Center Houston. Harris County’s diverse population has grown rapidly due to the strong job market and the region’s overall economic prosperity.
4. Maricopa County, AZ – 4,585,871
Maricopa County, anchored by Phoenix, is one of the fastest-growing regions in the country. With a population of over 4.5 million, it has become a hotspot for tech companies and innovation. The area is known for its beautiful desert landscapes, including the Sonoran Desert, and a growing arts and cultural scene. Its rapid population growth can be attributed to a high quality of life, affordable housing, and a booming job market.
5. San Diego County, CA – 3,269,973
San Diego County is famous for its stunning coastline, temperate climate, and military presence. Home to over 3 million people, it includes the city of San Diego and numerous suburban areas. The county boasts major attractions like the San Diego Zoo, Balboa Park, and SeaWorld, drawing millions of visitors each year. Its large population benefits from a thriving economy based on defense, tourism, and biotechnology.
6. Orange County, CA – 3,135,755
Orange County is a major suburban area in Southern California, known for its picturesque beaches and upscale communities. With a population exceeding 3 million, it includes cities like Anaheim, home of Disneyland, and Irvine, a tech hub. The county offers a high quality of life, with excellent schools, shopping centers, and recreational activities. Its proximity to Los Angeles and San Diego further enhances its appeal as a residential and economic hub.
7. Miami-Dade County, FL – 2,686,867
Miami-Dade County is the most populous county in Florida, with nearly 2.7 million residents. Known for its vibrant Latin American culture, the county includes Miami, a global city famous for its beaches, nightlife, and cultural diversity. Miami-Dade is an important economic center for finance, international trade, and tourism, attracting both residents and visitors from around the world. Its tropical climate and vibrant art scene make it a unique place to live.
8. Dallas County, TX – 2,606,358
Dallas County, located in North Texas, is home to over 2.6 million people and the bustling city of Dallas. Known for its blend of modern urban living and rich cultural history, the county has a thriving economy focused on telecommunications, technology, and finance. Dallas County’s major attractions include the Dallas Arts District, the Dallas Cowboys, and a growing culinary scene, making it a dynamic place to live and work.
9. Kings County, NY – 2,561,225
Kings County, more commonly known as Brooklyn, is one of New York City’s five boroughs and home to over 2.5 million residents. Known for its hip neighborhoods, cultural landmarks, and artisanal food scene, Brooklyn has become one of the most desirable places to live in the U.S. It offers a unique blend of historic charm and modern development, with attractions like the Brooklyn Bridge, Prospect Park, and the Brooklyn Museum.
10. Riverside County, CA – 2,492,442
Riverside County is part of the Inland Empire region in Southern California, with a population of nearly 2.5 million. Known for its sprawling desert landscapes and growing suburban communities, Riverside has seen rapid population growth in recent years. The county offers a more affordable alternative to the neighboring counties of Los Angeles and Orange while still providing access to the area’s major economic and cultural hubs. It’s also a gateway to natural attractions like Joshua Tree National Park.
