A couple of South Bronx neighborhoods lost 2/3 of their population in
one decade (1970s). Have any Chicago neighborhoods undergone similar rapid population loss? Or any other city?
http://www.demographia.com/db-nyc-ward.htm
(Bronx District 2 and 3)
Bronx District 3 was still at a population density of 34k / sq mile at the end of the decade.