1970 County Group Definitions

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1970 county groups are identified by the CNTYGP97 variable in the IPUMS USA 1970 Metro samples, which were originally called the "county group samples."

There are a few major differences between 1970 county groups and the most similar units identified in later samples (county groups in 1980 and PUMAs in 1990 and later samples):

Composition File

This Excel file provides a detailed listing of the counties (or county parts) comprising each 1970 county group:


Maps of 1970 county groups are provided through the links below. On the maps, the large numbers identify the first three digits of the county group code, and the smaller numbers identify the last two digits. (Leading zeros are not printed.)

Boundary File

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