The Zip Code Statistics from the U.S. Economic Census provides counts of establishments by size by North American Industry Classification System (NAICS) category for five-digit Zip Codes in 8 of the 18 sectors covered in the 2002 Economic Census. These sectors include roughly 60 percent of establishments with paid employees counted in the economic census. There are no statistics on the distribution of non-employer establishments by zip code.
The percent of retail establishments with sales, receipts, and/or revenues of $500,000 or more is a measure of the area's economic base and economic activity.
The data is from the U.S. 2002 Economic Census, Zip Code Statistics