From that whimsical start,the society has grown into the world's largest all-male singing organization, with more than 32,000 singers in more than 825 chapters in the United States and Canada. Another 4,000 barbershoppers are members of affiliated organizations in Australia, Germany, Great Britain, Ireland, The Netherlands, New Zealand, South Africa and Sweden.

The Barbershop Harmony Society is headquartered in Kenosha, Wisconsin. Harmony Hall is home to the Old Songs Library, the world's largest privately held collection of sheet music, containing 750,000 sheets and 125,000 titles from the heyday of Tin Pan Alley. The Heritage Hall Museum of Barbershop Harmony, also located in Harmony Hall, serves as a repository for barbershop memorabilia, early recordings, costumes, research materials and historical documents tracing the roots of the barbershop style.

A professional staff of 50 administers a wide range of programs and services, including:

• The Harmonizer, a bi-monthly magazine for members
• Digital mastering of audio and video productions
• Music publishing services, with more than 900 barbershop arrangements in print
• Convention planning for meetings attended by 10,000-13,000 members annually
• Harmony Marketplace, a merchandise operation grossing more than $1 million annually
• A traveling staff of music and membership specialists who conduct numerous workshops and clinics throughout North America
• Education programs such as Harmony College and Directors College, a week-long school attended by more than 600 singers annually