Census data provides essential information that allows social scientists, economists, and historians to better understand and analyze the past and present. IPUMS (Integrated Public use Microdata Service) USA is a remarkable online database that allows anyone to explore and examine federal census data from 1850 through the present. Created by Steven Ruggles at the Minnesota Population Center, IPUMS lets users examine past census microdata, highlighting individual level responses rather than aggregate data. Historians will also appreciate that IPUMS assigns uniform codes to all samples, circumventing any complications caused by change in terminology over time. To use IPUMS, users will need to create a free researcher account and agree to IPUMS' citation and redistribution policies. Once users create an account, they can search for data by selecting a variety of samples and variables and submit a request to receive a free data extract. As of this writing, IPUMS USA includes over 50 samples from the federal census and the more recent American Community Surveys.