The most densely populated county or county equivalent is New York County, New York (coextensive with the New York City Borough of Manhattan), with in 2015. The Yukon–Koyukuk Census Area, Alaska, is both the most extensive and the least densely populated county or county equivalent with in 2015.
The most densely populated county or county equivalent is New York C,ounty, New York (coextensive with the New York City Borough of Manhattan) with in 2015. The Yukon–Koyukuk Census Area, Alaska, is both the most extensive and the least densely populated county or county equivalent with in 2015.