“The Illegal Immigration Reform and Immigrant Responsibility Act of 1996, explicitly prohibits noncitizens from voting in federal elections. It is not legal in any state for a noncitizen to cast a ballot in a federal election. Any instance of illegally cast ballots by noncitizens has been investigated by the appropriate authorities, and there is no evidence that these votes—or any other instances of voter fraud—have been significant enough to impact any election’s outcome.”
…
“no state currently allows noncitizens to vote in statewide elections. Three states and Washington, DC, have municipalities that allow noncitizens to vote in certain local elections. San Francisco allows resident noncitizen parents and guardians to vote in school board elections. Oakland is currently attempting to enact a similar law. Some cities in Maryland and Vermont permit noncitizens to vote in municipal elections. New York City enacted a law allowing noncitizens to vote in local elections in 2021, but it was ruled unconstitutional by a state judge in 2022. Washington, DC, recently enacted a law to allow noncitizen residents to vote in all non-federal elections.”
https://bipartisanpolicy.org/blog/four-things-to-know-about-noncitizen-voting