Residents of Chatham, Town—Ville — Sub-district G, surnames I (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 9 | inge | patrick | M | 68 | Anglican | African Origins | United States | Farmers, general and nfs | 161 |
| 17 | irvin | bowes | M | 32 | | Irish | Ireland | Farmers, general and nfs | 186 |
| 18 | irvin | elizabeth | F | 30 | Roman Catholic | Irish | Ontario | No Occupation Listed | 186 |
| 19 | irvin | frank | M | 6 | Roman Catholic | Irish | Ontario | No Occupation Listed | 186 |
| 21 | irvin | ida | F | 1 | Roman Catholic | Irish | Ontario | No Occupation Listed | 186 |
| 20 | irvin | joseph | M | 4 | Roman Catholic | Irish | Ontario | No Occupation Listed | 186 |
| 17 | irvine | adam | M | 28 | Methodist | Irish | Ontario | Farmers, general and nfs | 195 |
| 21 | irvine | alexander | M | 20 | Methodist | Irish | Ontario | Farmers, general and nfs | 195 |
| 23 | irvine | eliza | F | 14 | Methodist | Irish | Ontario | No Occupation Listed | 195 |
| 24 | irvine | francis | M | 12 | Methodist | Irish | Ontario | No Occupation Listed | 195 |
| 19 | irvine | john | M | 22 | Methodist | Irish | Ontario | Farmers, general and nfs | 195 |
| 20 | irvine | martha | F | 24 | Methodist | Irish | Ontario | No Occupation Listed | 195 |
| 16 | irvine | mary | F | 48 | Methodist | Irish | Ireland | Farmers, general and nfs | 195 |
| 22 | irvine | mathew | M | 18 | Methodist | Irish | Ontario | Farmers, general and nfs | 195 |
| 18 | irvine | william | M | 26 | Methodist | Irish | Ontario | Farmers, general and nfs | 195 |
| 13 | isaac | annie | F | 25 | | Aboriginal peoples, n.s | Ontario | No Occupation Listed | 152 |
| 12 | isaac | james | M | 28 | | Aboriginal peoples, n.s | Ontario | Trappers or Hunters | 152 |
| 14 | isaac | nan | F | 12 | | Aboriginal peoples, n.s | Ontario | No Occupation Listed | 152 |
| 15 | isaac | nawbie | M | 4 | | Aboriginal peoples, n.s | Ontario | No Occupation Listed | 152 |