How is the data collected?
The Business Register is the Census Bureau’s source of information on employer establishments. A company operating at more than one location is required to file a separate report for each location or establishment. Companies engaged in distinctly different lines of activity at one location are requested to submit separate reports, if the business records permit such a separation, and if the activities are substantial in size.
It helps to know the industry code for your company before trying to find establishment or enterprise statistics.
The Census has a nice page of frequently asked questions for business statistics.
The Current Employment Statistics Program is a federal-state cooperative program. The CES survey is based on approximately 146,000 businesses and government agencies representing approximately 623,000 worksites throughout the United States.