Considered the unofficial end of America's summer, Labor Day is the holiday in the United States when the average worker is commemorated. The first observance of Labor Day is thought to have taken place on September 5, 1882 in New York City. A parade of 10,000 walked through the streets, organized by Peter J. McGuire, a Carpenters and Joiners Union secretary. After that many other states began to adopt and celebrate a Labor Day. It wasn't until 1894 that the first Monday in September was designated as the official Labor Day holiday. For those interested in knowing more about the number of workers being celebrated, the U.S. Census Bureau reported that as of May 2009 there were 155.1 million people age 16 or older employed in the U.S. workforce.