The USCIS Service Centers were established to handle the mail, file, data entry, and adjudication of most applications for immigration services and benefits. Those applications should be mailed to USCIS Service Centers - Service Centers are not staffed to handle walk-in applications or answer questions. Three of the four Service Centers have established special Post Office boxes to receive applications mailed to the Center by applicants or petitioners residing in its service area. The applications and petitions processed by each Service Center are listed on its home page, as are the special Post Office box numbers and zip codes by form type for the Service Centers using them. Prospective applicants should look at this list of forms to confirm that they are accepted by the Service Center in their area.

• Vermont Service Center (VSC)
  Jurisdiction: Connecticut, Delaware, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Puerto Rico, Rhode Island, Vermont, Virginia, Virgin Islands, West Virginia, and the District of Columbia
  
  Receipt numbers start with EAC.
  
  
• Nebraska Service Center (NSC)
  Jurisdiction: Alaska, Colorado, Idaho, Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Montana, Nebraska, North Dakota, Ohio, Oregon, South Dakota, Utah, Washington, Wisconsin and Wyoming
  
  Receipt numbers start with LIN.
  
  
• Texas Service Center (TSC)
  Jurisdiction: Alabama, Arkansas, Florida, Georgia, Kentucky, Louisiana, Mississippi, New Mexico, North Carolina, South Carolina, Oklahoma, Tennessee, and Texas
  
  Receipt numbers start with SRC.
  
  
• California Service Center (CSC)
  Jurisdiction: California, Nevada, Arizona, Hawaii, Guam
  
  Receipt numbers start with WAC.