Residents of Middleton — Sub-district D, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 10 | oatman | assican | M | 23 | Baptist | American | Ontario | No Occupation Listed | 393 |
| 13 | oatman | bertha | F | 10 | Baptist | American | Ontario | No Occupation Listed | 393 |
| 12 | oatman | elmer | M | 17 | Baptist | American | Ontario | No Occupation Listed | 393 |
| 9 | oatman | margaret | F | 40 | Baptist | American | Ontario | No Occupation Listed | 393 |
| 11 | oatman | orin | M | 21 | Baptist | American | Ontario | No Occupation Listed | 393 |
| 22 | odonnell | mary | F | 78 | Roman Catholic | Irish | Ireland | No Occupation Listed | 111 |
| 8 | oliver | oatman | M | 49 | Baptist | American | United States | Farmers, general and nfs | 393 |
| 19 | olmstead | gertrude | F | 1 | Roman Catholic | Irish | Ontario | No Occupation Listed | 23 |
| 18 | olmstead | isabelle | F | 3 | Roman Catholic | Irish | Ontario | No Occupation Listed | 23 |
| 17 | olmstead | joseph | M | 5 | Roman Catholic | Irish | Ontario | No Occupation Listed | 23 |
| 16 | olmstead | margaret | F | 33 | Roman Catholic | German | Germany | No Occupation Listed | 23 |
| 5 | olmstead | priscilla | F | 62 | Wesleyan Methodist | German | Ontario | No Occupation Listed | 14 |
| 15 | olmstead | simeon | M | 36 | Roman Catholic | Irish | Ontario | Farmers, general and nfs | 23 |
| 8 | olmsted | elkenah | M | 4 | Baptist | Welsh | Ontario | No Occupation Listed | 406 |
| 6 | olmsted | lafeyette | M | 34 | Baptist | Welsh | Ontario | Farmers, general and nfs | 406 |
| 7 | olmsted | martha | F | 30 | Baptist | English | Ontario | No Occupation Listed | 406 |
| 9 | olmsted | mary | F | 1 | Baptist | Welsh | Ontario | No Occupation Listed | 406 |
| 3 | onionsthorn | fanny | F | 12 | Anglican | English | England | No Occupation Listed | 21 |
| 2 | onionsthorn | jane | F | 14 | Anglican | English | England | No Occupation Listed | 21 |
| 1 | onionsthorn | john | M | 19 | Anglican | English | England | Surveyors, general and nfs | 21 |
| 4 | onionsthorn | william | M | 9 | Anglican | English | England | No Occupation Listed | 21 |
| 18 | ostranda | robert | M | 16 | Episcopal Methodist | Blank | Ontario | No Occupation Listed | 240 |
| 12 | ostrander | abigail | F | 18 | Episcopal Methodist | Blank | Ontario | No Occupation Listed | 75 |
| 3 | ostrander | agnes | F | 21 | Episcopal Methodist | Blank | Ontario | No Occupation Listed | 74 |
| 12 | ostrander | albert | M | 25 | Wesleyan Methodist | English | Ontario | Farmers, general and nfs | 73 |
| 5 | ostrander | allis | F | 17 | Episcopal Methodist | Blank | Ontario | No Occupation Listed | 74 |
| 16 | ostrander | anny | F | 26 | Christian Baptist | English | Ontario | No Occupation Listed | 374 |
| 14 | ostrander | catherine | F | 11 | Episcopal Methodist | Blank | Ontario | No Occupation Listed | 75 |
| 17 | ostrander | cathrine | F | 60 | Baptist | English | Ontario | No Occupation Listed | 84 |
| 2 | ostrander | cathrine | F | 36 | Baptist | German | Ontario | No Occupation Listed | 252 |
| 1 | ostrander | d | M | 33 | Baptist | Blank | Ontario | Farmers, general and nfs | 252 |
| 4 | ostrander | edith | F | 11 | Baptist | Blank | Ontario | No Occupation Listed | 252 |
| 15 | ostrander | edwin | M | 31 | Christian Baptist | Irish | Ontario | Farmers, general and nfs | 374 |
| 6 | ostrander | effy | F | 1 | Baptist | Blank | Ontario | No Occupation Listed | 252 |
| 14 | ostrander | elizabeth | F | 4 | Wesleyan Methodist | English | Ontario | No Occupation Listed | 73 |
| 2 | ostrander | ellenir | F | 40 | Episcopal Methodist | Blank | Ontario | No Occupation Listed | 74 |
| 16 | ostrander | emeline | F | 54 | Baptist | German | Ontario | No Occupation Listed | 168 |
| 8 | ostrander | georg | M | 0 | Episcopal Methodist | Blank | Ontario | No Occupation Listed | 74 |
| 1 | ostrander | george | M | 44 | Episcopal Methodist | Blank | Ontario | Farmers, general and nfs | 74 |
| 24 | ostrander | george | M | 10 | Wesleyan Methodist | Blank | Ontario | No Occupation Listed | 87 |
| 5 | ostrander | hanna | F | 20 | Methodist | English | Ontario | No Occupation Listed | 257 |
| 17 | ostrander | henrietta | F | 8 | | Irish | Ontario | No Occupation Listed | 374 |
| 4 | ostrander | hubert | M | 26 | Methodist | English | Ontario | Farmers, general and nfs | 257 |
| 6 | ostrander | ida | F | 12 | Episcopal Methodist | Blank | Ontario | No Occupation Listed | 74 |
| 23 | ostrander | isaac | M | 12 | Wesleyan Methodist | Blank | Ontario | No Occupation Listed | 87 |
| 9 | ostrander | jacob | M | 48 | Episcopal Methodist | Blank | Ontario | Farmers, general and nfs | 75 |
| 11 | ostrander | jacob | M | 24 | Episcopal Methodist | Blank | Ontario | Farmers, general and nfs | 75 |
| 15 | ostrander | james | M | 60 | Episcopal Methodist | Blank | Ontario | Farmers, general and nfs | 71 |
| 13 | ostrander | jannet | F | 27 | Wesleyan Methodist | Scottish | Ontario | No Occupation Listed | 73 |
| 15 | ostrander | john | M | 1 | Wesleyan Methodist | English | Ontario | No Occupation Listed | 73 |
| 7 | ostrander | john | M | 6 | Episcopal Methodist | Blank | Ontario | No Occupation Listed | 74 |
| 21 | ostrander | john | M | 40 | Wesleyan Methodist | Blank | Ontario | Farmers, general and nfs | 87 |
| 15 | ostrander | john | M | 59 | Baptist | German | Ontario | Ambiguous responses | 168 |
| 17 | ostrander | john | M | 20 | Baptist | German | Ontario | No Occupation Listed | 168 |
| 3 | ostrander | john | M | 13 | Baptist | Blank | Ontario | No Occupation Listed | 252 |
| 16 | ostrander | larenzo | M | 13 | Wesleyan Methodist | English | Ontario | No Occupation Listed | 73 |
| 13 | ostrander | lavina | F | 15 | Episcopal Methodist | Blank | Ontario | No Occupation Listed | 75 |
| 18 | ostrander | mable | F | 2 | | Irish | Ontario | No Occupation Listed | 374 |
| 10 | ostrander | marilla | F | 48 | Episcopal Methodist | Blank | Ontario | No Occupation Listed | 75 |
| 22 | ostrander | mary | F | 33 | Wesleyan Methodist | Blank | Ontario | No Occupation Listed | 87 |
| 5 | ostrander | mary | F | 9 | Baptist | Blank | Ontario | No Occupation Listed | 252 |
| 16 | ostrander | nancy | F | 62 | Episcopal Methodist | Blank | Ontario | No Occupation Listed | 71 |
| 18 | ostrander | sarah | F | 23 | Baptist | German | Ontario | No Occupation Listed | 168 |
| 19 | ostrander | sarah | F | 9 | Baptist | German | Ontario | No Occupation Listed | 168 |
| 4 | ostrander | william | M | 19 | Episcopal Methodist | Blank | Ontario | No Occupation Listed | 74 |
| 6 | ostrander | william | M | 1 | Methodist | English | Ontario | No Occupation Listed | 257 |
| 20 | ostsauder | charles | M | 21 | Methodist | German | Ontario | Farmers, general and nfs | 255 |
| 21 | ostsauder | israel | M | 10 | Methodist | German | Ontario | No Occupation Listed | 255 |
| 17 | ostsauder | lewis | M | 53 | Baptist | German | Ontario | Farmers, general and nfs | 255 |
| 18 | ostsauder | mary | F | 48 | Methodist | Irish | Ontario | No Occupation Listed | 255 |
| 19 | ostsauder | william | M | 19 | Methodist | German | Ontario | No Occupation Listed | 255 |
| 19 | oxford | cora | F | 3 | Methodist | English | Ontario | No Occupation Listed | 175 |
| 17 | oxford | elizabeth | F | 10 | Methodist | English | Ontario | No Occupation Listed | 175 |
| 15 | oxford | john | M | 14 | Methodist | English | Ontario | No Occupation Listed | 175 |
| 14 | oxford | margaret | F | 31 | Methodist | Irish | Ontario | No Occupation Listed | 175 |
| 18 | oxford | minnie | F | 5 | Methodist | English | Ontario | No Occupation Listed | 175 |
| 20 | oxford | nelly | F | 1 | Methodist | English | Ontario | No Occupation Listed | 175 |
| 13 | oxford | william | M | 32 | Methodist | English | Ontario | Farmers, general and nfs | 175 |
| 16 | oxford | william | M | 12 | Methodist | English | Ontario | No Occupation Listed | 175 |