Is it possible to override vendor/magento/module-sales/Api/Data/OrderAddressInterface.php as I want to get sales order address custom column value in order REST API.
It's not possible to override the interfaces using the
preference. Magento 2 does not allow Third-party developers to change the API Data interfaces defined in the Magento Core code.
Please try to use the
Extension attributes to achieve your requirement. Extension attributes extend functionality and often use more complex data types than custom attributes. These attributes do not appear on the GUI.
Please refer to the Magento DevDocs for more information here.
Also, refer to this post with similar question if it helps! Magento 2 : Override core Interface and Model