Mar 24, 2014

What's in a GeoID

Noticed that ACS data does not provide a GeoID and it is difficult to merge it with Census AFF data. Need to convert "Geo Name" into a GeoID to be able to "join" in ArcMap.
Here is an example of a GEOID for Honolulu County, Hawaii:

    STATE:  The first 2characters are the State code
    COUNTY:  3-characters are the county code
    TRACT: 6-characters are the census tract code
    BLOCK GROUP:  1-character is the census block group code
•    BLOCK:     3-characters are the census block code

Diagram from http://www.isbe.state.il.us/nutrition/pdf/census_geoid_inst_IL.pdf