This application aggregates 2012-2016 American Community Survey (ACS) data to approximate circular areas, specified by the user using a point location and one or more radius values. Data used are from the latest tract- or block-group-level 5-year period estimates, standard MCDC extract. Uses a block-based apportioning algorithm (BBIA) to apportion tract/block group data. Some data items are not available at the block group level.
If you need more reliable basic demographic data for smaller radii, try instead the CAPS 2010 application, which works with data from the 2010 census.