While it can be frustrating when someone is not listed in a census record, it is possible that the occasional person was enumerated more than once. A move during a census year, time spent at a “summer home,” living away from home during the week, separating from a spouse but not divorcing, are all reasons why someone may appear in a census enumeration more than once.  
Periodically review those conclusions and statements that were made in the early days of your research. It is easy when your research is just starting to copy something down without really evaluating it or to make an assumption that wasn’t as true as we thought it was. Is your researching hinging on a date, event, or place that you took as a “fact” early in your research that might not be as true as you thought it was?
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