Definition
GEO1_NG identifies the household's state within Nigeria in all sample years. States are the first level administrative units of the country. GEO1_NG is spatially harmonized to account for political boundary changes across census years; see the comparability discussion. A GIS map (in shapefile format), corresponding to GEO1_NG can be downloaded from the GIS Boundary files page in the IPUMS International web site.
The full set of geography variables for Nigeria can be found in the IPUMS International Geography variables list. For cross-national geographic analysis on the first and second major administrative level refer to GEOLEV1, and GEOLEV2. More information on IPUMS-International geography can be found here.
At the present moment, IPUMS International is only releasing integrated geography for the first level of geography for Nigeria. Year specific geography and maps will become available in the near future.