Residents of Pittsburg — Sub-district E, surnames I (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 10 | irwin | ann | F | 44 | Anglican | Irish | Ontario | No Occupation Listed | 221 |
| 18 | irwin | ann | F | 11 | Anglican | Irish | Ontario | No Occupation Listed | 221 |
| 11 | irwin | edward | M | 23 | Anglican | Irish | Ontario | No Occupation Listed | 221 |
| 23 | irwin | elean | F | 1 | Anglican | Canadian | Ontario | No Occupation Listed | 210 |
| 18 | irwin | elizabeth | F | 11 | Anglican | Canadian | Ontario | No Occupation Listed | 210 |
| 9 | irwin | francis | M | 50 | Anglican | Irish | Ireland | Farmers, general and nfs | 221 |
| 13 | irwin | francis | M | 18 | Anglican | Irish | Ontario | No Occupation Listed | 221 |
| 21 | irwin | frank | M | 4 | Anglican | Canadian | Ontario | No Occupation Listed | 210 |
| 15 | irwin | george | M | 9 | Anglican | Irish | Ontario | No Occupation Listed | 221 |
| 19 | irwin | isabella | F | 5 | Anglican | Irish | Ontario | No Occupation Listed | 221 |
| 20 | irwin | john | M | 5 | Anglican | Canadian | Ontario | No Occupation Listed | 210 |
| 16 | irwin | john | M | 5 | Anglican | Irish | Ontario | No Occupation Listed | 221 |
| 22 | irwin | marian | F | 3 | Anglican | Canadian | Ontario | No Occupation Listed | 210 |
| 17 | irwin | marthe | F | 29 | Anglican | Canadian | Ontario | No Occupation Listed | 210 |
| 17 | irwin | mary | F | 17 | Anglican | Irish | Ontario | No Occupation Listed | 221 |
| 16 | irwin | robert | M | 43 | Anglican | English | Quebec | Hotel Keepers and Managers | 210 |
| 19 | irwin | robert | M | 10 | Anglican | Canadian | Ontario | No Occupation Listed | 210 |
| 12 | irwin | robert | M | 21 | Anglican | Irish | Ontario | No Occupation Listed | 221 |
| 14 | irwin | william | M | 15 | Anglican | Irish | Ontario | No Occupation Listed | 221 |
| 11 | iwen | edward | M | 6 | Anglican | Irish | Ontario | No Occupation Listed | 152 |
| 10 | iwen | eveline | F | 8 | Anglican | Irish | Ontario | No Occupation Listed | 152 |
| 6 | iwen | henery | M | 20 | Anglican | Irish | Ontario | Servants nfs | 152 |
| 9 | iwen | joseph | M | 10 | Anglican | Irish | Ontario | No Occupation Listed | 152 |
| 8 | iwen | maggie | F | 13 | Anglican | Irish | Ontario | No Occupation Listed | 152 |
| 3 | iwen | sarah | F | 46 | Anglican | Irish | Ireland | No Occupation Listed | 152 |
| 7 | iwen | thomas | M | 19 | Anglican | Irish | Ontario | Servants nfs | 152 |
| 2 | iwen | william | M | 59 | Roman Catholic | Irish | Ireland | Labourers nfs | 152 |
| 4 | iwen | william | M | 25 | Anglican | Irish | Ontario | Labourers nfs | 152 |