Harold O'Carroll was born 19 October 1849 in Baltimore, Maryland, United States to Steven O'Carroll (1816-1899) and Justina Henriques (1820-1900) and died 27 April 1917 San Francisco, California, United States of unspecified causes.
Children
| Name | Birth | Death | Joined with |
| Charlotte O'Carroll (1875-1960) | 2 March 1875 Seattle, Washington, United States | 27 January 1960 San Francisco, California, United States | Haitao Wong (1876-1950) |
Siblings
| Name | Birth | Death | Joined with |
| Harold O'Carroll (1849-1917) | 19 October 1849 Baltimore, Maryland, United States | 27 April 1917 San Francisco, California, United States | Charlotte Hyvönen (1850-1920) |