43 CFR 2.3 - Where should you send a FOIA request?
(a) The Department does not have a central location for submitting FOIA requests and it does not maintain a central index or database of records in its possession. Instead, the Department's records are decentralized and maintained by various bureaus and offices throughout the country.
(c) Address requests to the appropriate FOIA contact in the bureau that maintains the requested records. The Department's FOIA Web site, https://www.doi.gov/foia, lists the physical and email addresses of each bureau's FOIA Officer, along with other appropriate FOIA contacts at http://www.doi.gov/foia/contacts.