Many US states took their own census in non-federal census years. If you’ve not determined when state censuses exist for your research areas, it might be worth your while.
The reason you can’t find your ancestor in the census index may be because the original is difficult to read or the “entry of interest” is hiding in a faded corner. A manual search may be helpful, but only if your interpretation and reading skills are better that those of the person making the image.
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