H1 identifies an active county or statistically equivalent entity that does not qualify under subclass C7* or H6.
H4 identifies a legally defined inactive or nonfunctioning county or statistically equivalent entity that does not qualify under subclass H6.
H5 identifies census areas in Alaska, a statistical county equivalent entity.
H6 identifies a county or statistically equivalent entity that is areally coextensive or governmentally consolidated with an incorporated place, part of an incorporated place, or a consolidated city.
C7 identifies an incorporated place that is an independent city; that is, it also serves as a county equivalent because it is not part of any county, and an MCD equivalent because it is not part of any MCD.