Robert Preston

Harold Hill

Shirley Jones

Marian Paroo

Buddy Hackett

Marcellus Washburn

Ron Howard

Winthrop Paroo

Hermione Gingold

Eulalie Mackechnie Shinn

Paul Ford

Mayor George Shinn

Pert Kelton

Mrs. Paroo

Timmy Everett

Tommy Djilas

Susan Luckey

Zaneeta Shinn

Harry Hickox

Charlie Cowell

Jesslyn Fax

Avis Grubb

Mary Wickes

Mrs. Squires

Charles Lane

Constable

William Fawcett

Lester Lonnergan

Barbara Pepper

Mrs. Hawkes

Max Showalter

Salesman On Train (uncredited)

Hank Worden

Undertaker

Sarah Seegar

Townswoman

Milton Parsons

Farmer

Larri Thomas

High School Girl

Colin Kenny

Brighton Townsman (uncredited)

Al Bain

Townsman (uncredited)

Ralph Hart

Young Boy Dancer

Delos Jewkes

Harley MacCauley

Percy Helton

Train Conductor (uncredited)