Calvert county is only 213 square miles. However the city of Baltimore, while not a county, does not belong to a county and is it's own political entity is only 92 square miles.
Calvert has the smallest county population.
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Maryland County's population is 13,604.
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 population density of Maryland County is 59.4 people per square kilometer.
Kent County with a population of 19,197.
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
About 73,650.
222,938
According to the U.S. 2010 Census, Montgomery County is the most populated county in Maryland.