Residents of Petrolia, T-V — Sub-district F, surnames I (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 9 | ide | thomas | M | 34 | Anglican | English | England | Accountants nec | 142 |
| 6 | inglis | bessie | F | 0 | Anglican | German | Ontario | No Occupation Listed | 178 |
| 5 | inglis | jennie | F | 3 | Anglican | German | Ontario | No Occupation Listed | 178 |
| 2 | inglis | john | M | 32 | Anglican | Scottish | Ontario | Painters, nfs | 178 |
| 3 | inglis | martha | F | 31 | Anglican | German | United States | No Occupation Listed | 178 |
| 4 | inglis | william | M | 6 | Anglican | German | United States | No Occupation Listed | 178 |
| 14 | ireland | margaret | F | 34 | Baptist | English | Ontario | Tailors and tailoresses | 281 |
| 5 | ironsides | john | M | 30 | Methodist | Scottish | Scotland | Carpenters | 196 |
| 5 | ironsides | mary | F | 23 | Presbyterian | Scottish | Ontario | Servants nfs | 198 |
| 9 | irwin | george | M | 26 | Anglican | Irish | Ontario | Servants nfs | 87 |
| 13 | isbester | adam | M | 35 | Presbyterian | Scottish | Scotland | Dealer, merchant etc. (Wholesale & retail trade) | 358 |
| 18 | isbester | buzz | M | 1 | Presbyterian | Scottish | Ontario | No Occupation Listed | 358 |
| 6 | isbester | claude | M | 0 | Presbyterian | Scottish | Ontario | No Occupation Listed | 349 |
| 5 | isbester | john | M | 3 | Presbyterian | Scottish | Ontario | No Occupation Listed | 349 |
| 15 | isbester | john | M | 12 | Presbyterian | Scottish | Ontario | No Occupation Listed | 358 |
| 17 | isbester | mabel | F | 5 | Presbyterian | Scottish | Ontario | No Occupation Listed | 358 |
| 2 | isbester | malcolm | M | 28 | Presbyterian | Scottish | Scotland | No Occupation Listed | 349 |
| 3 | isbester | margaret | F | 25 | Presbyterian | Irish | Ontario | No Occupation Listed | 349 |
| 14 | isbester | margaret | F | 28 | Presbyterian | Irish | Ontario | No Occupation Listed | 358 |
| 16 | isbester | maude | F | 8 | Presbyterian | Scottish | Ontario | No Occupation Listed | 358 |
| 4 | isbester | minnie | F | 5 | Presbyterian | Scottish | Ontario | No Occupation Listed | 349 |