This report, conducted by researchers at the Midwest Economic Policy Institute and the Project for Middle Class Renewal at the University of Illinois at Urbana-Champaign analyzes the course of unionization in Iowa and in the United States from 2006 to 2015. Some data from 2015 are also analyzed for the Iowa City metropolitan statistical area (MSA). This version for Iowa tracks unionization rates and investigates union membership across demographic, educational, sectoral, industry, and occupational classifications. The study subsequently evaluates the impact that labor union membership has on a worker’s hourly wage in Iowa and in America. Additionally, data on labor unions and similar labor organizations are included and analyzed. A few notable findings from the report include: Unionization has declined in Iowa. Today, there are approximately 23,500 fewer union members in Iowa than there were in 2006, contributing to the reduction of 573,000 union workers across the nation over the past ten years. The decline in union membership has occurred in both the public sector and the private sector in Iowa. Consequently, the total number of labor unions and similar labor organizations has declined over the past decade. There are 211 labor unions and similar organizations in Iowa, a decline of 36 establishments over the past ten years (-15.5 percent).