A Federal Information Processing Standards (FIPS) code that identifies a county, parish, or independent city within a state. In certain cases other geo-political entities, such as tribe via the BIA tribal code, may be used. For border sites, it identifies the geo-political equivalent to U. S. states, such as Mexican states or Canadian provinces.
When submitting transactions, a user may opt to use a Bureau of Indian Affairs tribal code in this fied (if the State Code was entered as ‘TT’ to indicate that this data is for a Native American Tribe).
Data in the application may be viewed in Tribal format by selecting Tribal Mode in the Admin > Security menu.
Must be a valid AQS county code or Tribal area code.
Allowable values: https://aqs.epa.gov/aqsweb/documents/codetables/states_and_counties.html