Answer based on context:

As of the 2010 United States Census, there were 219,607 people, 88,296 households, and 58,814 families residing in Saratoga County.  The population density was 271 people per square mile (105/km²).  There were 98,656 housing units at an average density of 122 per square mile (41/km²).  The racial makeup of the county was 94.3% Race (United States Census), 1.8% Race (United States Census), 1.5% Race (United States Census) or Race (United States Census), 0.2% Race (United States Census), 0.0% Race (United States Census), 0.5% from Race (United States Census), and 1.7% from two or more races.  2.4% of the population were Race (United States Census) or Race (United States Census) of any race.

How many people are there per 2 square miles?
542