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Congressional Research Service
Inforrning the legislative debate since 1914


May  19, 2025


Alien Registration Requirements

Section 262 of the Immigration and Nationality Act (INA)
requires most 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 they are
registered. Section 264 of the INA requires aliens over age
18 to carry issued proof of registration. 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. By regulation and statute, some categories of aliens
are exempted from registration requirements.

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) recently 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 INA 262.

On  March 12, 2025, DHS  published an interim final rule
(IFR), Alien Registration Form and Evidence of
Registration, effective April 11, 2025. The IFR creates a
new, general registration form for certain unregistered
aliens to comply with registration and fingerprinting
requirements under Section 262. The IFR follows a January
20, 2025, executive order that contains a provision for the
Identification of Unregistered Illegal Aliens. The
provision directs DHS to ensure that unregistered aliens
comply  with Section 262. It also directs agencies to treat
alien registration requirements as a civil and criminal
enforcement priority. Despite the seemingly broad reach of
Sections 262 and 264, U.S. Department of Justice data
show  that prosecutions under them have been rare.

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 had 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
had 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 them to be completed at U.S. ports of entry
through documentation of individuals' immigration
statuses. Some aliens, including Canadian visitors, were
exempt. In 1952, Congress enacted the 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  agricultural workers. A 1957 amendment to
the INA authorized the U.S. Departments of State and
Justice to waive fingerprinting for any nonimmigrants (i.e.,
aliens admitted on a temporary basis). Subsequent changes
directly or indirectly affected the registration requirements'
application to other groups (including those described in the
Exempted  and Impacted Populations section 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.

Statutory  Authorities  and  Penalties
The primary statutory authorities for alien registration are
found in Sections 261-266 of the INA (8 U.S.C. §§1301-
06). Apart from Section 262's registration requirements,
Section 264 (8 U.S.C. §1304) requires aliens 18 years and
older to carry any certificate of alien registration or alien
registration receipt card issued to him; failure to do so may
result in a fine and/or imprisonment for up to 30 days.
Section 265 (8 U.S.C. §1305) requires aliens to notify the
federal government within 10 days of any address change.

Section 266 (8 U.S.C. §1306) details other penalties related
to alien registration. Aliens who willfully fail or refuse to


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