The Bureau of Labor Statistics (BLS), a unit of the U.S. Department of Labor, provides a broad range of data about employment and unemployment, pay and benefits, productivity, time use, etc. Look at their list of available surveys.

Go to Sage Data: 

• Drill down through Browse by Subject > Labor and Employment.
• Click any topics of interest to expand.
• Select one or more data series to find data.

Some BLS data is available via WRDS (see access details) in the Public Data database. WRDS publishes the top series from each of the main surveys including Current Employment Statistics.

The U.S. Department of Labor produces unemployment insurance data and statistics. 

The International Labour Organization (ILO) produces ILOSTAT, a database of labor statistics, which includes labor statistics and estimates from over 200 countries from 1969 to present, as well as a number of other databases on labor standards, legislation and literature.

For data and analysis on employee benefits, go to the Employee Benefit Research Institute (EBRI).

Pennsylvania-specific information can be found at the Center for Workforce Innovation and Analysis, part of the PA Department of Labor and Economy.