8 CFR 316.1: Definitions.

As used in this part, the term:

Application means any form, as defined in 8 CFR part 1, on which an applicant requests a benefit relating to naturalization.

Residence in the Service district where the application is filed means residence in the geographical area over which a particular local field office of USCIS ordinarily has jurisdiction for purposes of naturalization, regardless of where or how USCIS may require such benefit request to be submitted, or whether jurisdiction for the purpose of adjudication is relocated or internally reassigned to another USCIS office.

Service district means the geographical area over which a particular local field office of USCIS ordinarily has jurisdiction for purposes of naturalization.