1. Demographic Data from U.S. Census
Bureau
• A census is a count of the population of a
country as of a specified date.
• Census information includes: number of
persons per household, household
relationships, sex, race, age, and marital
status. Additionally, a report on each
building identifies the number of housing
units at the address, the status of plumbing
facilities, the number of rooms, whether the
dwelling is owner-occupied, the housing
value, the rent, and the vacancy status.
• The smallest unit for the sample data is the
block group, a collection of adjacent blocks
that contain between 300 and 3,000 people.
Data are also available at higher levels of
aggregation.
2. Geographic Information System (GIS)
Suppliers
• Geographic Information Systems (GIS) is
a system of hardware and software used to
store, retrieve, map and analyze geographic