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#1: New York County, New York

69,468 people per square mile

#2: Kings County, New York

35,369 people per square mile

#3: Bronx County, New York

32,903 people per square mile

#4: Queens County, New York

20,554 people per square mile

#5: San Francisco County, California

17,179 people per square mile

#6: Hudson County, New Jersey

13,731 people per square mile

#7: Suffolk County, Massachusetts

12,416 people per square mile

#8: Philadelphia County, Pennsylvania

11,379 people per square mile

#9: District of Columbia County, District of Columbia

9,856 people per square mile

#10: Alexandria County, Virginia

9,314 people per square mile