less than 4 percent of the land mass largest concentration of the U.S. population only 3.5% of the acreage of US US Census Bureau although a minority of its population two-thirds found live in cities Over 60% of the U.S. population currently resides in cities 62.7% of the population lives in cities 40 percent 63 percent of the population lives three-quarters 62.7% of the population lives in cities findings