> The reasoning for such extremely strict geographic restrictions, I am unsure of
I think it's twofold:
1. There are some hyperlocal elections, such as for school districts. Only your local polling station will have the correct ballots for those elections, and if you vote at the wrong polling location you could vote in an election you shouldn't.
2. Minimization of voter fraud using analog technology: if you're assigned a particular polling station, that station and no other will be given your name on a list to check off. You can't go to two polling locations and vote twice, because no other station will have your name. Human error makes it impractical to give each station a complete list and then cross-check to find people who voted twice: too many false positives.
I think it's twofold:
1. There are some hyperlocal elections, such as for school districts. Only your local polling station will have the correct ballots for those elections, and if you vote at the wrong polling location you could vote in an election you shouldn't.
2. Minimization of voter fraud using analog technology: if you're assigned a particular polling station, that station and no other will be given your name on a list to check off. You can't go to two polling locations and vote twice, because no other station will have your name. Human error makes it impractical to give each station a complete list and then cross-check to find people who voted twice: too many false positives.