Key:addr:unit
 addr:unit
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| Description |
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The number, letter, or name included in the address to represent a subdivision (such as a single unit or flat) within a larger building or complex. 
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| Group: addresses |
| Used on these elements |
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Status: approved
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| Tools for this tag |
The number, letter, or name of a single unit or flat that exists within a larger complex. While a big building could have only one entrance, sometimes the way inside divides into different units or staircases, where certain apartments/flats/offices can only be reached through a specific unit. Useful for apartment, suite, or office numbers. Information necessary for postmen, for example.
How to map
addr:unit should be used in combination with addr:housenumber=* and addr:street=*.
There are some edge cases where multiple units apply to a single feature. An example of this is a business in a strip mall annexing an adjacent unit, joining both units into a single store while retaining the numbers for both units. In this case, the unit can be represented either as semicolon separated values (ex: 1;2;3) or by a range denoted by hypen, especially if the number of units represented is relatively large (ex: 1-7).
In the United States, there is no consensus on how to represent secondary unit designators, however according to taginfo it is far more popular to omit the designator and only include the identifier: there are only a few thousand "Apartment/Unit/Suite A" entries versus 106,734 "A" entries as of 2021. This practice only allows data consumers to format the unit as "#A", which the USPS says will result in rejected mail in some cases. [1] Consider using addr:full=* to disambiguate.
See Key:addr for more information
Similar pages for structural reference: Key:religion, Key:waterway.