==Census Data==
===Population===
The Census Gazetteer files for 2010, 2000 and 1990 can give use population by census place. See https://www.census.gov/geo/maps-data/data/gazetteer.html
Column 13 INTPTLAT Latitude (decimal degrees) First character is blank or "-" denoting North or South latitude respectively
Column 14 INTPTLONG Longitude (decimal degrees) First character is blank or "-" denoting East or West longitude respectively.
===Relationships===
See https://www.census.gov/geo/maps-data/data/relationship.html
These text files describe geographic relationships. There are two types of relationship files; those that show the relationship between the same type of geography over time (comparability) and those that show the relationship between two types of geography for the same time period.