New York City's borough of Manhattan has about 1.6 million residents sharing just under 23 square miles of land. Meanwhile, 669 square mile Loving County, TX has just 86 residents, Business Insider reports in an analysis of U.S. Census Bureau data. According to the U.S. Census Bureau's population estimates and their tabulations of the land area of each county, 50.1 percent of the US population lives in the nation’s densest counties, indicated in dark purple on the illustrated map, which highlights the wide dispersion in the population density of the US's 3,142 counties. The 244 densest US counties are shown in dark purple, developed using U.S. Census Bureau data for 2014.
The nation's largest populations, by county, are in Los Angeles County, CA; Cook County, IL; Harris County, TX; Maricopa County, AZ, San Diego County, CA; Orange County, CA, Miami-Dade County, FL and Kings County, NY.
The most populous county in Connecticut, Fairfield County, ranked 51st by population (945,438) among the nation’s counties. Just behind are Hartford County, ranked 59th (897,985) and New Haven County, ranked 64th (861,277).
All three are among the 244 densest U.S. counties that comprise just over half of the nation's population.