The most populous county (or county equivalent) is
Los Angeles County, California with 10,226,506
people as of 2005, and the least populous county is
Loving County, Texas with 67 people as of 2000.
The most densely populated county (or county equivalent)
is New York County, New York with
66,940 people per square mile (ppsm) as of 2000, and the least densely populated
county is Lake and Peninsula Borough, Alaska
with 0.08 ppsm as of 2000. The least densely populated county equivalent
is Yukon-Koyukuk Census Area, Alaska
with 0.04 ppsm as of 2000.