USCIS has announced that as of yesterday, March 18, 2020, they have suspended routine in-person services. This step is being taken to slow the spread of the Coronavirus (COVID-19)! USCIS will continue to operate but without public personal contact. USCIS will provide very limited emergency services that require personal contact; you must contact the USCIS Contact Center for more information.
Please visit this page for more information: USCIS Temporarily Closing Offices to the Public March 18-April 1
Source of Information:
USCIS (USCIS.gov), 3/17/20, News Alert:
USCIS Temporarily Closing Offices to the Public March 18-April 1
CNN (CNN.com), 3/18/20, News Article:
US Citizenship and Immigration suspends in-person immigration services