| NAME | ADDRESS | OCCUPATION | SOURCE |
| Costgan, Thomas SOUNDEX Unknown |
530 Stephenson | Iron Worker | 1889 City Directory |
| Costigan, Harry SOUNDEX Born in: United States (Illinois) |
10708 Langley | None | 1910 Federal Census |
| Costigan, Mrs. Kate SOUNDEX Unknown |
550 Stephenson | None | 1889 City Directory |
| Costigan, Thomas SOUNDEX Unknown |
530 Stephenson | Iron Worker | 1889 City Directory |
| Costigan, William SOUNDEX Born in: United States (Illinois) |
10708 Langley | Delivery Boy (Grocery ) | 1910 Federal Census |
| Costigan, William H. SOUNDEX Born in: Canada (Anglophone Prov.) |
10708 Langley | Watchman (Car Works: Pullman Palace Car Company ) | 1910 Federal Census |