The Small Business Administration (SBA), Office of Advocacy, does a nice job of organizing and displaying data on their website about small businesses in the United States. In addition, annually the SBA produces a summary report to the president on the small business economy. This year, they've included a series of data tables which many will find useful, in the appendix.
- Business Counts, 1985-2007
- Business Turnover, 1985-2007
- Macroeconomic Indicators, 1995-2007
- Number of Businesses by State, 2005-2007
- Business Turnover by State, 2006-2007
- Private Firms, Establishments, Employment, Annual Payroll, and Receipts, 1988-2006
- Employer Firms and Employment by Firm Size and State, 2005
- Non Employer and Employer Firms and Employment by Firm Size and Industry, 2005 and 2006
- Employer Firm Births and Deaths by Employment Size of Firm, 1990-2005
- Job Generation and Destruction by Type of Change and Employment Size of Firm, 1990-2005
- Opening and Closing Establishments, 1992-2007
- Quarterly Net Job Change by Firm Size, 1992-2007
- Characteristics of Self-Employed Individuals, 1995-2006
- Characteristics of Employees by Firm Size, 1995 and 2006
- Bank Lending Information by Size of Firm, 1991-2007
I've included a screen shot here of one data element I am sure will get very big notice when data is available for 2008, "Bank Lending Information by Size of Firm." Right now, it only covers through 2007.
In addition to the data tables in the report, there is a long chapter based on the Panel Study on Entrepreneurial Dynamics program of work.