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U.S. Census Data - https://www.census.gov/
Explore Census Data - https://data.census.gov/cedsci/
Use Advanced Search for Filters.
Quick Facts - https://www.census.gov/quickfacts/fact/table/US/PST045219
This US map is a visual representation of the population density and racial diversity in the United States. The 308,745,538 dots represent "each person residing in the United States at the location they were counted during the 2010 Census."
http://demographics.coopercenter.org/racial-dot-map/
Image Copyright, 2013, Weldon Cooper Center for Public Service, Rector and Visitors of the University of Virginia (Dustin A. Cable, creator).
The Big Radius Tool is intended to provide “gross” numbers for a mileage-based radius, beginning at 50 miles and going up to 500 miles. Counties are aggregated, so this isn’t a hyper-precise tool but is intended to provide intelligence on the counties within a large (50 miles or more) radius.
It’s easy—just type in the name of a city or county and use the “autofill” to choose the center point of the radius. Then use the slider to increase or decrease the radius (minimum is 50 miles).