Radical Cartography has published dozens of stunning charts and maps that illustrate much of the data in the 1870 U.S. census. You can view small versions of the maps and charts on your screen or download much larger images as ZIP files and then view them offline at your leisure.
The 1870 census was the first statistical census of the United States. Earlier efforts focused mostly on the names and the total number of inhabitants. The 1870 census asked many more questions and those answers were tabulated to provide an interesting statistical picture of a fast-growing country that was full of immigrants.
54 maps and charts are available, reproduced from the Statistical Atlas of the United States as published in 1874. You can view the images on your computer screen; click on an image to see a larger version. Instructions are also provided to download even larger images.
You can see the Statistical Atlas of the United States at http://www.radicalcartography.net/index.html?9thcensus