In the Census

How accurate are the census records? I'm sure this question has arisen for every genealogist at some point in their research.  We quickly learn that census records cannot be considered the absolute and final authority. 

Why does someone's age change every census by less (or more!) than the 10 years between censuses? Why is a surname being spelled differently on three different censuses? Why does an ancestor have a different first name in the 1861 census (is it even the right person?)?  And why does the census give a different place of birth for great grandma each time?

Consider first what question was actually asked by the census taker. For example with ages - did he ask about how old the person was, or how old they were on their last birthday or.....  Were the ages of all the adults in an area rounded up (or down) to the closest multiple of five (yes, it happened)?

People lied about their ages, or sometimes simply got it wrong. My grandmother always insisted she was born on 30 June 1906.  According to her birth registration, however, she was born on 30 June 1905.

Remember spelling was not exact back in the 1800s and earlier. A census taker wrote what he heard, and whether or not he was a good speller or was familiar with the surname dictated what we see recorded on the census page. You get what I will grumpily refer to as 'some semi-literate clerk's best guess".  Keep in mind that it was not your ancestor who filled in the census themselves.

Different first names? Children were usually given at least two names at birth and an individual might choose to be known by their middle name, or perhaps a nickname. My ancestor Elizabeth Green (nee May) was always known as Betsy - and that is the name recorded in several censuses.

The next question we need to ask ourselves is - who provided the answers on that census? Was it a parent? Mothers may have had a better idea of their children's birth years and ages than the father. Was it an older child (perhaps the parents were not home), a grandparent or even a neighbour giving the information? Tracing a family through several censuses may have seen a different respondent each time.  All these factors will affect the quality of the census information.

As with many other genealogical records, the census records can contain inaccurate information, mistakes and even outright lies