If you have a question about a filing mailed to the Chicago, Dallas, or Phoenix Lockbox, e.g.:
In these situations, you may email us at LockboxSupport@uscis.dhs.gov and we will answer each email in turn as soon as possible. Please include the form number, receipt number, petitioner and/or applicant name, and mailing address with your email. Please do not include social security numbers in emails.
But if your question relates to an application or petition that was filed online or mailed directly to a USCIS service center, or an application or petition that has already been accepted by the Lockbox, or if you have a question about your eligibility to file, you should instead call the National Customer Service Center (NCSC) on (800) 375-5283, or contact the service center or office processing your case, via the email addresses below, or use the InfoPass system on our website, https://infopass.uscis.gov , to make an appointment at your local USCIS office.
USCIS Service Centers
If you contacted the National Customer Service Center with a case-related inquiry and more than 30 days have passed and you have not received a response, you may email the appropriate USCIS Service Center with your inquiry:
If you do not receive a response within 21 days of contacting the Service Center, you may contact the USCIS Headquarters Office of Service Center Operations by email at SCOPSSCATA@dhs.gov.
For questions about adoptions from Hague Convention countries, please call 1-877-424-8374 or send an e-mail to NBC.Hague@dhs.gov.
For questions about non-Hague adoption cases, please e-mail: NBC.Adoptions@dhs.gov.
USCIS Historical Reference Library
The USCIS Historical Reference Library is located at:
111 Massachusetts Avenue NW
The Library is open to non-USCIS researchers by appointment only. For a research appointment or other assistance, please email CISHistory.Library@dhs.gov.
Do not send information about specific cases to this address. We only accept website-related comments.
Although we will read every email message within two business days, due to the number of messages, we may not respond to each message we receive.
Last Reviewed/Updated: 10/24/2014
Before I File
After I File