The procedures depend on the individual office and the type of case. Some district offices and local offices expect you to hand-carry applications and file in person. Other offices, and all service centers, require you to file by mail. The detailed instructions are available on the USCIS Web site. Today, most routine applications are filed by mail with a specific service center. Which service center you must use depends on both the type of case and where you live.
When mailing something, be sure to use certified mail, return receipt requested, and keep a copy of everything you mailed, usually for the rest of your life.
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