One hundred years ago the 1910 Census counted 92.2 million Americans. It was the first census in which urban enumerators distributed advance questionnaires to city-dwellers, a day or two prior to the count, to familiarize them with the forms.
For the first time, respondents were asked about their native language. They were also asked whether they were a Union or Confederate Civil War veteran.
The 1910 Census was the first in which enumerators were hired through the Civil Service (pursuant to the edict of President Theodore Roosevelt in 1907). It was also the first census in which Puerto Rico was canvassed (population 1,118,012).
Two hundred years ago, in the 1810 Census, assistant marshals were required to visit each household to verify the count. They counted 7.2 million Americans, nearly double that of the first census of twenty years before.