When doing business research, it is useful to obtain the NAICS codes and SIC codes. The links below will help you find the codes for specific types of industries. Using the search term peanut butter identifies the following as potential codes:
311911 Roasted Nuts and Peanut Butter Manufacturing ; SIC 2099
It is important to know these codes in order to retrieve statistical information produced by the Census. You can also use these codes to search in some databases.
One source you can use to apply NAICS codes is the Business Patterns database from the U.S. Census Bureau. This can help you determine what has been the trend in a particular industry from a National, County, Metro, and Zip Code perspective. Please note, however, that this will probably not include those establishments that are purely web-based.