Minor Civil Division/CCDs, 1970, 1980, & 1990
Minor civil divisions (MCD's) are the primary political or administrative divisions of a county and represent many different kinds of legal entities with a wide variety of governmental and/or administrative functions. MCD's are variously designated as American Indian reservations, assessment districts, boroughs, election districts, gores, grants, magisterial districts, parish governing authority districts, plantations, precincts, purchases, supervisors' districts, towns, and townships.
A major complication is that MCD boundaries change frequently and substantially. The Census Bureau has devised Census County Divisions (CCDs) which it uses for statistical reporting purposes instead of MCDs in most states where MCDs are small or have frequently changing boundaries. MCDs and CCDs are geographically comprehensive -- all the land in the United States is located in such an area. Both MCDs and CCDs are a possible substitute "neighborhood" if tract, block numbering area and enumeration district are not available.
This dataset includes socio-economic and demographic data for all MCDs and CCDs in the US. The first data file consists of data from the 1970 Census, and has 35,072 cases and 217 variables. The second covers data from the 1980 Census, and includes 231 variables for 35,103 cases. The third data file covers data from the 1990 Census and includes 249 variables for 35,136 cases.