Columbia subject headings:
Postal zones--Social aspects--United States.
Social surveys--United States.
United States--Social conditions--1980-2020.
United States--Social life and customs--1971-
Harvard subject headings:
Consumers' preferences--United States
Postal zones--Social aspects--United States.
Social surveys--United States
United States--Social conditions--1980-2020
United States--Social life and customs--1971-
Princeton subject headings:
Postal zones--Social aspects--United States.
Social surveys--United States.
United States--Social conditions--1980-2020.
United States--Social life and customs--1971-