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ReferenceUSA contains more than 55 million business in the United States. To find the number of establishments in an area:
1. Click on "Advanced Search"
2. select business type and "Map based search".
3. When map opens, enter zip code, state or other geographic area.
4. Use "Select an area" to define a radius, shape, etc.
5. Click on DONE.
6. Get list of businesses by clicking the link under Results.