How many voices are there in 4 part choir?

A four-part choir can have any number of voices as long as there are enough people to actually be considered a choir instead of an ensemble. Four-parts actually has nothing to do with how many people are in the choir. Instead, it dictates that there will be four different voice parts. Usually this means there will be soprano, alto, tenor, and bass parts. However, there could be a 4 part choir made up entirely of women where you would likely have 1st sopranos, 2nd sopranos, 1st altos, and 2nd altos. The same is true for men, but the parts would have different names ( most likely1st tenor, 2nd tenor, baritone, and bass).