Current numbers for both the County Business Patterns and the Nonemployer Statistics are now part of the https://data.census.gov website. The PDF below (Finding Census Data) gives interim instructions for data from the Census.
Start with ReferenceUSA to find competitors (and prospects) by industry and location. Includes a directory of over 15 million U.S. public and private companies. (Rutgers-restricted access) ReferenceUSA for Large Companies
Mergent Online offers up to 25 years of company financials and selected equity research for public companies around the world. (Rutgers-restricted access)
For U.S. firms, Mergent Horizon is useful for a 360 degree view of a company's competitors, suppliers, partners, and corporate customers, using a detailed hierarchical classification system for actual products and services. (Rutgers-restricted Access)
Looking for information about a private company has always been a challenge. PrivCo, is an excellent resource for business and financial research on non-publicly traded companies. It includes the synopsis of the company, M&A activities and Venture Capital deals in the industry.(Rutgers-restricted Access)
Rutgers, The State University of New Jersey, an equal access/equal opportunity institution. Individuals with disabilities are encouraged to direct suggestions, comments, or complaints concerning any accessibility issues with Rutgers web sites to: firstname.lastname@example.org or complete the Report Accessibility Barrier / Provide Feedback Form.