The U.S. federal government collects data on metropolitan areas around the 
country.  These areas are called Standard Metropolitan Statistical Areas 
(SMSA).  An SMSA contains a city (or more than one) of a specified population
size and the county (or counties) in which it is located.  Sometimes
contiguous counties are included as well.  An SMSA may cross state lines.

This data set contains (for each SMSA, listed on NKNW p. 1369) land area,
total population, percent of population in the central cities, percent of
population aged 65 years or more, number of active physicians, number of
hospital beds, percent of population with a high school diploma or its 
equivalent, number of persons in the civilian labor force, total income
of all residents, total number of serious crimes committed, and geographic
region in which the SMSA is found (northeast, north central, south, or west).
These data are from the late 1970's. 

These are the data found in NKNW Appendix:

Neter, Kutner, Nachtsheim, and Wasserman (1996). Applied Linear
 Statistical Models, 4th Edition, Irwin Press, ISBN 0-256-11736-5.