The United States Adult Soccer Association (USASA) is a national organization and sanctioning body for amateur soccer in the United States. It represents one part of the fifth and lowest tier in the American Soccer Pyramid, alongside US Club Soccer (USCS), and underneath the USL's Premier Development League and the National Premier Soccer League, which are USASA-affiliated but are considered to be at the fourth tier of competition for a variety of historical reasons. The USASA purports to have over 250,000 adult members playing within its leagues and teams, making it the USA's largest division of organized soccer at adult level.