181 Jewish schools in New York City in 1917

Here is an interesting list of Jewish schools (of all sorts) which were in existence in New York City in 1917. While obviously the quality and religious orientation of these schools were hardly uniform (some were Sunday schools, others had sessions every day; some had 40 students and a couple over 1000) I'll bet it is nevertheless surprising to many that 181 such places in New York City alone existed in 1917.