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This page in a nutshell: Classes (or subclasses) are entities used as part of instance of (P31) and subclass of (P279) statements.
This list will help identify currently used classes for use in statements.
Add or modify the existing list as appropriate, but keep in mind existing assignments and class structure when doing so.
Following are the subclasses administrative territorial entity (Q56061) and their meanings. For a current tree of subclasses of political division, see this tool .
political territorial entity (Q1048835) (anything with a legally-binding administrative body above it)
political union (Q1140229) (e.g., the European Union)state (Q7275) (geography with a government above it, sovereign or not)
sovereign state (Q3624078) (e.g. Japan (Q17) , Mexico (Q96) , etc.)
Commonwealth realm (Q202686) (e.g. United Kingdom (Q145) , Canada (Q16) , etc.)federated state (Q107390) (includes subclasses U.S. state (Q35657) , province of Canada (Q13218404) , state of Australia (Q5852411) , etc.)federated state (Q5164076) (includes subclasses constituent country of the United Kingdom (Q3336843) , country of the Kingdom of the Netherlands (Q15304003) , the unity of the Realm (Q1191549) , etc.)dependent territory (Q161243) (includes subclasses Crown Dependencies (Q185086) , French overseas collectivity (Q719487) , dominion of the British Empire (Q223832) , etc.)local government (Q6501447)
municipality (Q15284) (includes subclasses municipality of Japan (Q1054813) )
city (Q515) Includes many kinds of bottom-level governments such as civil township (Q1394476) and administrative county (Q2560047) autonomous administrative territorial entity (Q2533461) (includes subclasses the unity of the Realm (Q1191549) )1st , 2nd , 3rd , 4th , 5th -level (might be deleted, not sure what to do with these) table of administrative divisions by country (Q1423994)
administrative territorial entity of the United States (Q852446) (includes subclasses U.S. state (Q35657) ,unincorporated territory of the United States (Q2107324) , county of the United States (Q47168) )administrative territorial entity of Australia (Q4494320) (includes subclasses state or territory of Australia (Q178712) , local government area of Australia (Q1867183) , etc.)administrative territorial entity of Japan (Q1850442) (includes subclasses municipality of Japan (Q1054813) )Etc. One item like this should exist for each sovereign state. designation for an administrative territorial entity (Q15617994)
country (Q6256) (geographic area)
constituent state (Q1763527) (includes subclasses constituent country of the United Kingdom (Q3336843) , country of the Kingdom of the Netherlands (Q15304003) , etc.)occupied territory
unrecognized state province (Q34876) county (Q28575) time zone (Q12143) Other related concepts
nation (Q6266) (cultural grouping, also a subclass of community (Q177634) )
nation state (Q179671) polity (Q1063239) (under philosophical concept)geographic location (Q2221906) (parent class of administrative territorial entity (Q56061) ; also includes regions without any kind of administrative above them, like time zone (Q12143) ) 
