I'm defining "address" as "a physical location, usually visibly numbered".  <b>Numbered</b> was used in the definition to exclude purely geographical features not usually considered to have or need an address.  <b>Visibly</b> was used in the definition to exclude entities that might be numerically coded (like census features) but the number is not typically apparent nor used for directional or delivery purposes.  <b>Usually</b> was used in the definition because exceptions abound (such [residences in Carmel][1]).

Enumerating the possible kinds of addresses resulted in:

- buildings.
- entire floors of buildings.
- apartments/offices/rooms in buildings.
- cubicles/mailstops in buildings.
- loading docks.
- slips on boat docks.
- slots in trailer parks.
- post office boxes and private mail drops.
- military APO/FPO addresses.
- jail/prison cells.
- campground lots.
- outbuildings (not usually visibly numbered, but often desireable in delivery databases).
- undeveloped parcels (not usually visibly numbered, but often required in address databases).

What other kinds of "physical locations, usually visibly numbered" have I forgotten to include in the above list?  Two questionables are:

- hospital beds.
- cemetary plots.


  [1]: http://www.semaphorecorp.com/misc/carmel.html