This volume, the second of a multi-volume reference work, presents county and district demographic data and the geographical location of American congressional districts between 1789 and 1942. Volume II is considerably different from its predecessor, United States Congressional Districts, 1788-1841 (Greenwood Press, 1978), largely due to the increasing amount of census information available during successive decades in the 19th century. United States Congressional Districts and Data, 1843-1883 emphasizes the statistical description of districts, including occupational categories and agricultural output, as well as racial and other characteristics of the population. Thus, it reflects the increasing usefulness to social scientists of the United States census. References to individual congressmen have been eliminated in this volume, and the bulk of it is devoted to aggregating data by each district. Presenting these data at the county level should enable researchers to get a better feeling for the data and to visualize, through maps, the variations within each district.