Title 13 - Business Credit and Assistance
Chapter I - Small Business Administration
Part 121 - Small Business Size Regulations

SBA's Small Business Size Regulations are contained in Title 13 of the Code of Federal Regulations, part 121 (13 CFR §121). 

The Electronic Code of Federal Regulations (eCFR) is maintained by the U.S. National Archives and Records Administration.  They include all changes to SBA's Small Business Size Regulations and are current as of the date specified at the top of the linked page. 

For information about any actions SBA has taken or has proposed to take regarding its Small Business Size Regulations, visit SBA's What's New Web site.