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The 2024 ACS 1-Year PUMS file has not yet been released amidst the U.S. federal government shutdown. Once these data are available, IPUMS will process and release them as quickly as possible.
MIGMETRO1
Metropolitan status 1 year ago
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Description

MIGMETRO1 indicates whether the respondent lived in a metropolitan area one year ago and, if so, whether they also resided within a central/principal city.

A metropolitan area is a region consisting of a large urban core together with surrounding communities that have a high degree of economic and social integration with the urban core. See METAREA for more information.

For the 1950 sample, MIGMETRO1 distinguishes central city status only if the central city/cities and the remainder of the metropolitan area each had 100,000+ residents in 1980, using the 1980 central city definitions.

For ACS and PRCS samples (2005 and later), IPUMS derives MIGMETRO1 codes based on Migration Public Use Microdata Areas (MIGPUMA1). If a respondent resided in a Migration PUMA that was only partially within a metropolitan area or central/principal city, MIGMETRO1 indicates a status of "indeterminable (mixed)."

In ACS and PRCS samples, Migration PUMAs are identified only for respondents who lived in a different residence 1 year ago. All other respondents are coded as "N/A" in MIGMETRO1.