[<< wikipedia] ADP National Employment Report
The ADP National Employment Report (also popularly known as the ADP Jobs Report or ADP Employment Report) is sponsored by ADP, and was originally developed and maintained by Macroeconomic Advisers, LLC. The report's methodology was revised in November 2012 by Moody's Analytics. The report is a measure of non-farm private sector employment which is obtained by utilizing an anonymous subset of roughly 400,000 U.S. businesses which are clients of ADP. During the twelve-month period, this subset averaged over U.S. business clients and over U.S. employees working in all private industrial sectors.

Similar indices are created by Paychex and Intuit for Small Business.
The Paychex | IHS Small Business Jobs Index
With small businesses representing nearly 95 percent of all employers in the U.S., the Paychex | IHS Small Business Jobs Index serves as an indicator of the overall economy, providing a monthly, up-to-date measure of change in small business employment. The data for the jobs index comes from a subset of the Paychex client base, approximately 350,000 businesses with fewer than 50 workers in the U.S. - See more at: https://web.archive.org/web/20140610110528/http://www.paychex.com/jobs-index/#sthash.BCU1Ty3S.dpuf
Intuit Small Business Indexes 
Our indexes are designed to provide statistically sound data and insight into small business trends and behavior. We collect actual data from Intuit software users, analyze the numbers, and publish monthly so you can follow the pulse of small business today.