According to census.gov, Vinton County, Ohio, has the least population at 13,372 people in 2007.
According to census.gov and the Census 2000, Forest County, Pennsylvania, has the smallest population at 4,946 people.
The smallest county in Indiana by both area and population is Ohio County. It occupies 87 square miles, with an estimated population of only 6128 in 2010. It was split off from Dearborn County in 1844.
Tyrrell County is the smallest by population. The population of the county is 4.247.
Pickett County. The population was 4,945. It has the smallest population of any county in Tennessee according to the 2000 census
McCormick County is the county with the smallest population. The county has a total area of 394 square miles. The population is approximately 9960 residents.
The smallest county by population in Wyoming is Niobrara County with 2,484 people (2010 US Census).
According to zip-codes.com, Vinton County is the county in Ohio with the lowest population at 12,806.
Smallest county population wise in Ireland is Leitrim 27-28 thousand.
Robertson County
Clark County is Idaho's smallest county based on population with a population of 982 as of the 2010 Census. Payette County is Idaho's smallest county based on area with 408 square miles.
County Leitrim has the smallest population in Ireland.
According to census.gov, the population of Pickaway County Ohio is 53,606.
The smallest county in Minnesota is Ramsey County (156 square miles).