https://en.wikipedia.org/wiki/Loving_County,_Texas
https://www.sos.state.tx.us/elections/historical/loving.shtm...
Edit: according to this[1] PDF, Loving County, TX had an official population of 67 in 2000, but the voting data link in the parent comment says that 156 people voted. Hmmm.
Seems more likely to me that the Census is incorrect or that there is something going on with multiple residences.
Additionally, Texas might or might not have a habit of purging dead or emigrant voters from their voting rolls, which would skew the number of registered voters.
Lastly, yes, the census is almost certainly an undercount, including in the more (shall we say) government-counting-everybody-skeptical rural regions of the country.
> Thanks to Texas’ domicile law, people who don’t live or work in the county can still vote there if they own a piece of land—and there’s plenty of land in Loving County for sale. “All you need to do is claim one of these little old deserted shacks or even a tree that you can eat your supper under as your own,” says one woman, who asked not to be named. “It’s all perfectly legal.”
The whole article is worth a read. It’s wild. Especially considering it was written before social media.
[1]https://www.texasmonthly.com/news-politics/not-so-loving-cou...