San Francisco County, with 47 square miles. Next is Santa Cruz County with 446 square miles.
Alpine County
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
California is not a country, it is a state.
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).
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, Vinton County, Ohio, has the least population at 13,372 people in 2007.
The smallest county in Minnesota is Ramsey County (156 square miles).
The largest county in Kenya is Turkana County, while the smallest county is Mombasa County.