The 1851 Census included some minor variations in data collected depending on Province - the following relate to Ontario:
- Column 1 – Names
- Column 2 – Profession, trade, or occupation
- Column 3 – Place of birth
- Column 4 – Religion
- Column 5 – Residence if out of limits
- Column 6 – Age at next birthday
- Column 7 – Sex, male
- Column 8 – Sex, female
- Column 9 – Married or single
- Column 10 – Widowers or widows
- Column 11 – Colored persons
- Column 12 – Residents, members of family (male)
- Column 13 – Residents, members of family (females)
- Column 14 – Residents, not members of family (male)
- Column 15 – Residents, not members of family (female)
- Column 16 – Members of family absent (male)
- Column 17 – Members of family absent (female)
- Column 18 – Deaf and dumb
- Column 19 – Blind
- Column 20 – Lunatics
- Column 21 – Attending school (male)
- Column 22 – Attending school (female)
- Column 23 – Births in 1851 (male)
- Column 24 – Births in 1851 (female)
- Column 25 – Deaths in 1851 (male)
- Column 26 – Deaths in 1851 (female)
- Column 27 – Deaths in 1851, age and cause of death
- Column 28 – Houses (brink, stone, frame, log, etc.)
- Column 29 – Houses, number of stories
- Column 30 – Houses, number of families occupying
- Column 31 – Houses vacant
- Column 32 – Houses being built
- Column 33 – Horses
- Column 34 – Cows
- Column 35 – Sheep
- Column 36 – Pigs
- Column 37 – Carriages for pleasure
- Column 38 – Carriages for hire
- Column 39 – Quantity of land attached to tenement
- Column 40 – Shop, stores, inns, taverns, schools, etc.
- Column 41 – Manufactures of all kinds – mills, ship yards, etc., their produce, etc., and whether worked by steam or water
- Column 42 – Number of hands employed
- Column 43 – Remarks