Here’s a neat site called gCensus.com that combined Google Maps and Census data to make a cool way to get find basic census data. 

I was easily able to find that Forsyth County, NC (where I’ve lived for a year has:

Land: 409.6 sq. miles
Water: 3.3 sq. miles
Population: 306,067
Houses: 133,093

While my old home of Prince William County, VIrginia has:

Land: 337.8 sq. miles
Water: 10.6 sq. miles
Population: 280,813
Houses: 98,052

Kind of cool.