There are many different numbering schemes for assigning numbers to entities. These generally require an agreed set of rules, or a central coordinator.
Numbering schemes include:
The E.164 numbering plan for telephone numbers, including:
... (4.6 mi²) of it is land and 1.2 km² (0.4 mi²) of it is water. The total area is 8.91% water.
Demographics
As of the census of 2000, there are 1,546 ...