Why compare birth-country voting laws at all?
The US Constitution places no restriction on where a member of Congress was born. A Representative must be a US citizen for seven years and a Senator for nine; beyond that, the origin of the person filing in for the oath is irrelevant. That openness is why, across the life of the Republic, the House and Senate have included naturalized citizens born in Ireland, India, Cuba, Kenya, Vietnam, Switzerland, and dozens of other places. This directory covers 38 such birth countries.
But the same cannot be said in reverse. If a naturalized American — someone who earned their citizenship the way these Congress members did — were to move to the country of their own birth, the odds are strong they would have no vote at all. Of the 38 tracked countries on this page, only 5 grant broad voting rights to non-native-born residents. 16 offer limited rights, usually restricted to municipal or local races. 14 prohibit non-citizen voting entirely. And 3 do not hold competitive national elections at all, making the question largely academic.
Put in the terms people usually debate in the United States: the American system trusts a naturalized citizen enough to send them to write federal law. A clear majority of the countries those same lawmakers were born in would not trust a counterpart American in the reverse scenario to cast even a single ballot. The asymmetry is the whole story of this page.
Use the timeline below to see which countries were represented in Congress in any given year. The filters let you narrow the list to countries that ban non-citizen voting, allow it only locally, or extend broad rights.
How the four voting-status categories are defined
Banned means no non-citizen of any kind, under any visa or residency condition, may cast a ballot in a public election. This is the most restrictive category and is how most of the world still operates. It includes countries with otherwise strong democratic institutions — national sovereignty over the vote is treated as inseparable from citizenship.
Partial covers a wide middle ground. In many European Union members, EU citizens may vote in local and European Parliament elections but not in national ones. In other countries, long-term residents of any nationality can vote in municipal races. The common thread is that partial regimes draw a firm line at the national legislature — the same legislature these US Congress members actually sit in.
Allowed is the rarest category. The clearest examples are the United Kingdom, Ireland, and several Commonwealth states, where qualifying Commonwealth citizens may vote on equal footing with citizens of the home country. New Zealand allows any permanent resident to vote in national elections after one year. A small number of Latin American constitutions also grant meaningful non-citizen suffrage.
No functioning elections is used for countries where the competitive electoral premise simply does not hold — one-party states, dictatorships, or countries without meaningful ballot access for anyone. In these cases the question of non-citizen voting is moot, though the tracker still records them because US Congress members were born there.