Could they be a relative? Does the individual show up as a child in earlier census? Search other records such as deeds, wills to see if the person shows up. Could individuals be in-laws? Check marriages of the county for husbands of sisters, aunts, mothers.
Make it a practice to extract all the persons with the same surname living in the same county. Are they family? They could be family connection or related connection such as where they came from. If your family lives near a state our county border, go ahead and extract the persons with the same surnames from neighboring counties. I have usually found important clues and connections among those with the same surname that has enhanced my research.
- Keep a research log and cite your sources
- Misspelled names are ok
- Finding missing ancestors
- Finding evidence that ancestor served in the U.S. military