Blacksville,Georgia,
Northwest Hancock,Maine,
Township 157-30,Minnestota,
Victory Township, Minnesota,
Bean's Purchase, New Hampshire, and
Flat, Alaska
Centralia, Pennsylvania
They all only have a population of 4, according to the 2000 census.
Petroleum County is the least populated county in Montana, with a population of around 500 people.
Ohio County.
Liberty County recorded 7,021 people in the US Census of 2000 which marks it as both the least populated and least densely populated county in Florida. It was a close race with Lafayette County which recorded 7,022 residents.
County Leitrim is the least populated at around 28,500 people.
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According to the 2000 census, Liberty County was least populated, with 7,021 people, closely followed by Calhoun County with 7,022. Both are tiny rural counties in North Florida.
According to census.gov, Taliaferro County, Georgia, has the least population at 1,884 people in 2007.
The most populated county in the US is Los Angeles County in California with a total population of 9,878,554.
Issaquena County is the least populated county in Mississippi with a population of 1,406 as of the U.S. 2010 Census.
Wirt County, with a 2008 population of 5,757.
Menominee county, at just over 4,200 residents.
Northumberland is the least densely populated county in England, with a population density of around 62 people per square kilometer.