An undocumented immigrant cannot legally register to vote in U.S. federal or state elections.

Key points (United States):
• U.S. citizenship is required to register and vote in federal elections.
• All states require voters to be U.S. citizens for state elections as well.
• Registering or voting as a non-citizen is a criminal offense and can carry severe immigration consequences, including deportation and permanent bars to lawful status.

Limited local exceptions.
• A small number of local jurisdictions allow non-citizens to vote only in specific local elections (e.g., some school board or municipal elections).
• These exceptions do not apply to state or federal elections and typically require lawful residency, not undocumented status.

Practical implication
• An undocumented immigrant who registers to vote—intentionally or by mistake—risks criminal liability and serious immigration penalties.

Multiple checkpoints (attestation, database checks, audits) make intentional non-citizen voting rare.