Reference USA has, for years, been a source that students could turn to to find information on businesses. Sitting at the reference desk, I have seen it used for research papers (in business and economics) and job searches. But in the last few years they have added a graphical, geographical search mode.
Here is how to use the database to find the businesses within a radius of any point on the map:
One can also draw a shape on the map with your cursor and capture any businesses within that shape and Reference USA’s vast database. This could be useful for research in sociology, health disparities, or many other fields.