What is the largest county in Florida and how many square miles is it?

Because the population of South Florida is largely confined to a strip of land between the Atlantic Ocean and the Everglades, the Miami Urbanized Area (that is, the area of contiguous urban development) is about 110 miles long (north to south), but never more than twenty miles wide, and in some areas only five miles wide (east to west). South Florida is longer than any other urbanized area in the United States except for the New York metropolitan area. It was the eighth most densely populated urbanized areas in the United States in the 2000 census. As of the 2000 census, the urbanized area had a land area of 2,890.7 square kilometres (1,116 square miles), with a population of 4,919,036, for a population density of 1,701.7 per square kilometre (4,407.4 per square mile). Miami and Hialeah (the second largest city in the metropolitan area) had population densities of more than 10,000 per square mile (more than 3,800 per square kilometre). The Miami Urbanized Area was the fifth largest Urbanized Area in the United States in the 2000 census, ahead of the Dallas-Fort Worth-Arlington, Texas Urbanized Area.