Using Census Records

General Information:

http://www.cyndislist.com/census-worldwide/census-records-online/

https://familysearch.org/wiki/en/Category:Census_records_by_country

https://www.census.gov/en.html

https://en.wikipedia.org/wiki/Census

https://www.census.gov/history/www/through_the_decades/census_instructions/

https://familysearch.org/wiki/en/United_States_Census_Forms

Maps:

https://www.mapofus.org/united-states/ (online service)

http://publications.newberry.org/ahcbp/ (online service)

http://goldbug.com/animap/ (software for sale)