| | Donald | Westerhazy | Owner of the pool. |
| | Lucinda | Merrill | Neddy's wife. |
| | Helen | Westerhazy | Donald's wife. |
| | Neddy | Merrill | Protagonist. |
| | Aphrodite | | A guest at the party. |
| | | Grahams' | One of the places Neddy would go by swimming home. |
| | | Hammers' | One of the places Neddy would go by swimming home. |
| | | Lears' | One of the places Neddy would go by swimming home. |
| | | Howlands' | One of the places Neddy would go by swimming home. |
| | | Crosscups' | One of the places Neddy would go by swimming home. |
| | | Bunkers' | One of the places Neddy would go by swimming home. |
| | | Levys' | One of the places Neddy would go by swimming home. |
| | | Welchers' | One of the places Neddy would go by swimming home. |
| | | Hallorans' | One of the places Neddy would go by swimming home. |
| | | Sachs' | One of the places Neddy would go by swimming home. |
| | | Biswangers' | One of the places Neddy would go by swimming home. |
| | Shirley | Abbott | Neddy's former mistress. |
| | | Gilmartins' | One of the places Neddy would go by swimming home. |
| | | Clydes' | One of the places Neddy would go by swimming home. |
| | Mrs. | Graham | The Graham matriarch. |
| | Mrs. | Hammer | The Hammer matriarch. |
| | Enid | Bunkers' | A friend of Neddy's. |
| | Rusty | | Owned a raft. |
| | | Tomlinsons' | A guest at Enid's party. |
| | Mrs. | Levy | Had Japanese lanterns on their property. |
| | | Pasterns' | One of the places Neddy would go by swimming home. |
| | Mrs. | Halloran | The Halloran matriarch. |
| | Helen | Sachs | The Hallorans' only daughter. |
| | Eric | Sachs | Helen's husband. |
| | Grace | Biswanger | The type of party hostess who invites the opthalmologist, the vet, the real-estate dealer, and the dentist. |
| | | | Andromeda - The beautiful daughter of King Cepheus and Queen Cassiopeia. |
| | | | Cepheus - Constellation. |
| | | | Cassiopeia - Constellation. |
