Characters in Password to Larkspur Lane

Nancy Drew

Also in The Secret of the Old Clock, The Hidden Staircase, The Bungalow Mystery, Together with the Hardy Boys, The Mystery at Lilac Inn, The Secret at Shadow Ranch, The Secret of Red Gate Farm, The Clue in the Diary, Nancy Drew, Girl Detective, Nancy's Mysterious Letter

Lady Helen

Mr. and Mrs. Corning

Carson Drew

Also in The Secret of the Old Clock, The Hidden Staircase, The Mystery at Lilac Inn, The Secret at Shadow Ranch, The Secret of Red Gate Farm, The Message in the Hollow Oak, The Clue of the Tapping Heels, The Mystery of the Brass Bound Trunk, The mystery at the moss-covered mansion, The clue in the jewel box

Hannah Gruen

Also in The Secret of the Old Clock, The Hidden Staircase, The Bungalow Mystery, The Mystery at Lilac Inn, The Secret at Shadow Ranch, The Message in the Hollow Oak, The Clue of the Tapping Heels, The Mystery of the Brass Bound Trunk, The Secret in the Old Attic, The Clue of the Leaning Chimney

Helen Corning / Helen Archer

Also in The Secret of the Old Clock, The Hidden Staircase, The Bungalow Mystery, The Mystery at Lilac Inn

Dr. Spires

Inspector Mulligan

Mrs. Schneider

Effie Schneider

Also in The Mystery of the Brass Bound Trunk, The Secret in the Old Attic

Mr. Jordan (Nancy Drew)

Mr. Stone