House numbering is the system of giving a unique number to each building in a street or area, with the intention of making it easier to locate a particular building. The house number is often part of a postal address. The term describes the number of any building with a mailbox, or even a vacant lot.
A house number in Paris, France
A RAPID number sign in New Zealand. The number 5 means that the property is between 40 and 60 metres (130 and 200 ft) from the datum point of the road, and is on the left hand side of the road as viewed from the datum point.
An example of the house numbering in rural area of Xiulin, Hualien, Taiwan, "No. 178-1, Jiawan". Note that "Jiawan" is not a street name, but a settlement name.
Clockwise scheme. A similar, counter-clockwise scheme also remains in use in parts of Germany.
An address is a collection of information, presented in a mostly fixed format, used to give the location of a building, apartment, or other structure or a plot of land, generally using political boundaries and street names as references, along with other identifiers such as house or apartment numbers and organization name. Some addresses also contain special codes, such as a postal code, to make identification easier and aid in the routing of mail.
Write Your Address Clearly, public service poster, James Fitton (1958)