A Sanctuary Processing Center was the entry point for Sanctuary Districts in the United States of America on Earth in the early 21st century. In Sanctuary District A, this was the administrative headquarters for the Admin Services.
In 2024 the Processing Center for Sanctuary District A in San Francisco was occupied during the Bell Riots and its staff was taken hostage. Among the hostages was Lee, a Public Health official. (DS9: "Past Tense, Part I", "Past Tense, Part II")