| Cory | R. | Mining Overseer | Northampton | 1883 | Herald Almanack |
| Cory | R. | Mining Overseer | Northampton | 1884 | Herald Almanack |
| Cory | R. | Mining Overseer | Victoria District (Northampton) (Uga) | 1884 | WA Almanack |
| Cory | R. | Mining Overseer | Northampton | 1885 | Herald Almanack |
| Cory | R. | Mining Overseer | Victoria District (Northampton) | 1886 | WA Almanack |
| Cory | R. | Mining Overseer | Northampton | 1887 | WA Almanack |
| Cory | R. | Mining Overseer | Northampton | 1888 | WA Almanack |
| Cory | R. | Mining Overseer | Northampton | 1889 | WA Almanack |
| Cory | Rd. | Miner | Victoria District (Northampton) | 1881 | WA Almanack |
| Cosgrove | Arthur | Gardener | Kelmscott | 1897 | Witton's Directory |
| Cosgrove | J. | Farmer | Northam | 1873 | Herald Almanack |
| Cosgrove | J. | Farmer | Northam | 1874 | Herald Almanack |
| Cosgrove | J. | Farmer | Northam | 1875 | Herald Almanack |
| Cosgrove | J. | Farmer | Northam | 1875 | WA Almanack |
| Cosgrove | J. | Farmer | Northam | 1876 | Herald Almanack |
| Cosgrove | J. | Farmer | Northam | 1876 | WA Almanack |
| Cosgrove | J. | Farmer | Northam | 1877 | Herald Almanack |
| Cosgrove | J. | Farmer | Northam | 1877 | WA Almanack |
| Cosgrove | J. | Farmer | Northam | 1878 | Herald Almanack |
| Cosgrove | J. | Farmer | Northam | 1879 | WA Almanack |
| Cosgrove | J. | Farmer | Northam | 1880 | WA Almanack |
| Cosgrove | W. I. | Auctioneers, Mining Agents, Sale Yards | Bayley Street, Coolgardie | 1897 | Witton's Directory |
| Cosh | Chas. | | King Street, Coolgardie | 1897 | Witton's Directory |
| Cosmopolitan Hotel | Corpaccioli, C. | Proprietor | Lamb Street, Perth | 1897 | Witton's Directory |
| COSSACK | | | | 1888 | WA Almanack |
| Costello | - | Carpenter | Albany | 1885 | Herald Almanack |
| Costello | A. | Carpenter | Geraldton | 1879 | Herald Almanack |
| Costello | A. | Carpenter | Victoria District (Geraldton) | 1880 | WA Almanack |
| Costello | H. | | 36 Queen Street, Perth | 1897 | Witton's Directory |
| Costello | Henry C. | City Surveyor | 6 Howick Street, Perth | 1897 | Witton's Directory |
| Costello | J. | Tidewaiter | Wellington | 1873 | Herald Almanack |
| Costello | J. | Tidewaiter | Bunbury | 1874 | Herald Almanack |
| Costello | J. | Tidewater | Bunbury & Australind | 1874 | WA Almanack |
| Costello | J. | Cabinet Maker | Perth | 1882 | WA Almanack |
| Costello | J. | Cabinet Maker | Perth | 1884 | Herald Almanack |
| Costello | J. | Cabinet Maker | Perth | 1884 | WA Almanack |
| Costello | J. | Cabinet Maker | Perth | 1885 | Herald Almanack |
| Costello | J. | Cabinet Maker | Perth | 1886 | WA Almanack |
| Costello | J. | Cabinet Maker | Perth | 1887 | WA Almanack |
| Costello | J. | Cabinet-Maker | Perth | 1888 | WA Almanack |
| Costello | J. | Cabinet Maker | Perth | 1889 | WA Almanack |
| Costello | J. W. | Blacksmith | Bunbury | 1887 | WA Almanack |
| Costello | J. W. | Blacksmith | Bunbury | 1888 | WA Almanack |
| Costello | J. W. | Blacksmith | Bunbury, Etc. | 1889 | WA Almanack |
| Costello | Jno. | Tidewaiter and Light-house Keeper | Bunbury | 1877 | WA Almanack |
| Costello | Jno. | Tidewaiterand Lighthousekeeper | Wellington District (Bunbury Etc.) | 1879 | WA Almanack |
| Costello | Jno. | - | Wellington District (Bunbury, Etc) | 1880 | WA Almanack |
| Costello | Jno. | - | Wellington District (Bunbury, Etc.) | 1881 | WA Almanack |
| Costello | Jno. | Pensioner | Wellington District (Bunbury, Etc.) | 1882 | WA Almanack |
| Costello | Jno. | Pensioner | Wellington District (Bunbury, Etc.) | 1884 | WA Almanack |
