แหล่งที่มา WikiPedia: สำมะโนสหรัฐ ค.ศ. 2020 http://census.gov/2020census/ http://2010.census.gov/2010census/about/timeline-t... http://ask.census.gov/cgi-bin/askcensus.cfg/php/en... https://www.census.gov/history/www/genealogy/decen... https://web.archive.org/web/20101220032051/http://...
