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postalCodePrefix

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.

Thing > Property > postalCodePrefix

A defined range of postal codes indicated by a common textual prefix. Used for non-numeric systems such as UK.
Values expected to be one of these types
Text
Used on these types
DefinedRegion

Source

https://github.com/schemaorg/schemaorg/issues/2506