12,000 isn't a small town, it's a small city. The school I went to had a town/surrounding farmers population of about 1200 (600 in town, guessing for the rural

12,000 isn't a small town, it's a small city. The school I went to had a town/surrounding farmers population of about 1200 (600 in town, guessing for the rural area). It functioned just fine with ~35 students to a grade, ~17 students to a class (each grade had a "band/not-band" schedule).