Residents of Waterloo N — Sub-district C, surnames O (1881 Census)
| # | Surname | Given | Sex | Age | Religion | Origin | Birthplace | Occupation | HH |
| 8 | oberholzer | abram | M | 25 | Other Brethren, n.e.c. | German | Ontario | Manufacturers | 74 |
| 7 | oberholzer | alice | F | 43 | Other Brethren, n.e.c. | German | Ontario | No Occupation Listed | 74 |
| 9 | oberholzer | angelina | F | 23 | Other Brethren, n.e.c. | German | Ontario | No Occupation Listed | 74 |
| 3 | oberholzer | elisabeth | F | 70 | Mennonite | German | United States | No Occupation Listed | 86 |
| 10 | oberholzer | lillie | F | 21 | Other Brethren, n.e.c. | German | Ontario | No Occupation Listed | 74 |
| 6 | oberholzer | owen | M | 45 | Other Brethren, n.e.c. | German | Ontario | Manufacturers | 74 |
| 11 | oberholzer | rachel | F | 14 | Other Brethren, n.e.c. | German | Ontario | No Occupation Listed | 74 |
| 1 | ohliger | christian | M | 33 | Lutheran | German | Germany | Farmers, general and nfs | 42 |
| 3 | ohliger | elisabeth | F | 10 | Lutheran | German | Ontario | No Occupation Listed | 42 |
| 2 | ohliger | eva | F | 34 | Lutheran | German | Germany | No Occupation Listed | 42 |
| 4 | ohliger | karolina | F | 5 | Lutheran | German | Ontario | No Occupation Listed | 42 |
| 5 | ohliger | katharina | F | 2 | Lutheran | German | Ontario | No Occupation Listed | 42 |
| 23 | olinski | paulina | F | 23 | Roman Catholic | German | Germany | No Occupation Listed | 231 |
| 24 | olinski | philip | M | 1 | Roman Catholic | German | Germany | No Occupation Listed | 231 |
| 22 | olinski | thomas | M | 26 | Roman Catholic | German | Germany | Labourers nfs | 231 |
| 25 | ortman | john | M | 46 | Lutheran | German | Germany | Labourers nfs | 138 |
| 2 | ortman | john | M | 18 | Lutheran | German | Ontario | Mason nfs or combined | 138 |
| 1 | ortman | sophia | F | 61 | Lutheran | German | Germany | No Occupation Listed | 138 |
| 6 | oswald | frederick | M | 69 | Lutheran | German | Germany | Labourers nfs | 140 |
| 7 | oswald | sophia | F | 58 | Lutheran | German | Germany | No Occupation Listed | 140 |