How do you know if county schools are closed on election day?
If a school is going to be closed on election day, it should be announced at the school.
If you want to know how many schools were closed on a day that has been a while back, yoi could look in the local papers of that time to find out the schools that were closed in your area. If you want to know what schools were closed in another area,. you would need to look in newspapers from the area the schools are in.