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Alien Registration Requirements

Section 1302, Title 8 of the (.S. Code requires aliens (i.e.,
non-U.S. citizens or nationals) who are age 14 and older
and present in the United States for 30 days or more to
apply for registration and fingerprinting with immigration
authorities. Parents or legal guardians of children under age
14 must ensure the children are registered. Section 1304(e)
requires aliens age 18 and over to carry proof of
registration. Section 1303(b) exempts certain categories of
aliens from registration requirements. Failure to comply
with these and other registration requirements, codified at 8
U.S.C. §§1301-1306,  may subject aliens to misdemeanor
penalties and serve as grounds for removal from the
United States.

Long-standing regulations implementing these requirements
did not provide specific registration forms for every
category of nonexempted  aliens, including those who
entered the United States without inspection and were
unlawfully present. The U.S. Department of Homeland
Security's (DHS's) U.S. Citizenship and Immigration
Services (USCIS) has stated that, under these regulations,
a significant number of aliens present in the United States
have had no direct way to register and meet their obligation
under [Section 1302].

On March   12, 2025, DHS published an interim final rule
(IFR), Alien Registration Form and Evidence of
Registration, effective April 11, 2025. The IFR created a
general registration form for certain unregistered aliens to
comply  with Section 1302's requirements beginning on the
effective date. The IFR followed a January 20, 2025,
executive order that directs DHS to ensure that unregistered
aliens comply with the relevant provisions of Section 1302.
The executive order also directs agencies to treat alien
registration requirements as a civil and criminal
enforcement priority. DHS published a final rule with
technical changes on June 29, 2026.

Historical  Background
The federal government has imposed alien registration
requirements of varying scope since the Naturalization Act
of 1798. Some requirements have targeted specific groups,
such as Chinese nationals in the late 19th and early 20th
centuries and enemy aliens during World War I.

Current registration requirements have their roots in the
Alien Registration Act of 1940. The 1940 act required
aliens to be registered and fingerprinted before being issued
a visa. Aliens age 14 and older who remained in the United
States for 30 days or longer and had not already been
registered were required to apply for registration and be
fingerprinted at a U.S. post office or other places designated
by the Commissioner  of the former Immigration and
Naturalization Service (INS). Parents and guardians were


Updated  August 4, 2026


required to ensure alien children under 14 were registered.
Aliens subject to registration requirements were also
required to report address changes to the INS. Failure to
comply  was punishable by fines and/or imprisonment.

From  August 1940 through March  31, 1944, alien
registration was recorded on Alien Registration Forms (AR-
2s). Since April 1, 1944, Alien Registration Numbers (A-
Numbers)  have been recorded in Alien Files (A-Files),
which are the official files for all immigration and
naturalization records.

Following World  War  II, federal regulations transferred
registration functions from post offices to INS and
designated registration to be completed at U.S. ports of
entry through documentation of individuals' immigration
statuses. Some aliens, including Canadian visitors, were
exempt  from registration requirements. In 1952, Congress
enacted the Immigration and Nationality Act (INA), which
contained registration and fingerprinting provisions that
closely resembled the 1940 act.

Legislation and regulatory changes following the INA's
enactment narrowed  the scope and application of these
requirements. After the INA's enactment, federal
regulations exempted from registration requirements
Canadian  citizens and British subject visitors and
nonimmigrant  (i.e., aliens admitted on a temporary basis)
agricultural workers. A 1957 amendment to the INA
authorized the U.S. Departments of State and Justice to
waive fingerprinting for any nonimmigrants. Subsequent
changes directly or indirectly affected the registration
requirements' application to other groups (including those
described below). According to one scholarly analysis,
these and other developments resulted in alien registration
requirements rarely being enforced, as there was no
regulatory apparatus in place to register anyone outside of
the ordinary process of applying for selected forms of
immigration status. In 2025, a bill was introduced (H.R.
2129) to repeal the 1940 act. As of the date of this In Focus,
the bill is pending before the House Judiciary Committee.

Statutory  Authorities  and  Penalties
The primary statutory authorities for alien registration are
found in 8 U.S.C. §§1301-06. Apart from Section 1302's
registration requirements, Section 1304(e) requires certain
aliens to carry proof of registration, and failure to do so
may  result in a fine and/or imprisonment for up to 30 days.
Section 1305(a) requires aliens to notify the federal
government  within 10 days of any address change. Section
1306 details other penalties related to alien registration.
Aliens who willfully fail or refuse to apply for registration
and fingerprinting may be subject to a fine and/or
imprisonment  for up to six months. Aliens who fail to give