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.
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
The smallest county by population in Wyoming is Niobrara County with 2,484 people (2010 US Census).
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.
In terms of population the largest is Nairobi, the smallest Lamu county. In terms of size the largest is Turkana County about 77000 km2 the smallest Mombasa
Lake of the Woods County in Minnesota has the smallest population, with an estimated population of around 3,900 people.
County Leitrim has the smallest population in Ireland.
The smallest county in Minnesota is Ramsey County (156 square miles).
According to census.gov, Vinton County, Ohio, has the least population at 13,372 people in 2007.
Based on population, Pickett County is the smallest county with population of 5,146 as of July 1, 2015. Based on area, Trousdale County is the smallest county with 114 square miles.