- Homer Macauley – Protagonist, 14-year-old telegraph messenger living in fictional town of Ithaca, California
- Katie Macauley – Homer's mother, who plays the harp
- Bess Macauley – Homer's elder sister, who plays the piano
- Mary Arena – Neighbor, girlfriend of Homer's brother Marcus, friend of sister Bess
- Ulysses Macauley – Homer's four-year-old brother
- Mr. Grogan – Owner and old-time telegraph operator of Ithaca's telegraph station
- Mr. Spangler – Manager of telegraph station
- Miss Hicks – Homer's history teacher, who moralizes during Homer's detention
- Hubert Ackley III – Homer's rival
- Auggie Gottlieb – Newspaper boy and leader of a neighborhood gang of young boys
- Matthew Macauley – Homer's deceased father
- Marcus Macauley – Homer's elder brother, enrolled in the Army
- Mr. Ara – Town grocer
- Diana Steed – Mr. Spangler's girlfriend
- "Girl on the corner"
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