3 November 2016 Update: As of WooCommerce Customer/Order CSV Export version 4.1, this will no longer be needed as version 4.1 will be using a state name instead of the code for the five countries which use this type of format.
Japanese addresses are a bit of a special case – apparently they roll a little bit differently. As a result of this when using the WooCommerce Customer/Order CSV Export extension the state names aren’t output but rather their ID. Fortunately this can be solved fairly easily with a small code snippet:
Not sure what to do with code snippets? See What Do I Do With These Code Snippets?