What years did you work in Irvington ? It had to be after 1980 . Before that it was the largest town in the USA by population around 60 k citizens . 95% of it’s graduates attended 4 year institutions ( 3000 high school kids) . Yes it was your typical blue collar town. It collapsed after the mid 70’s and became not too long ago the crime capital of NJ. Newark’s demise led to old Essex County ‘s collapse in : East Orange ,Orange, Irvington and certain parts of Bloomfield, Belleville . Then Union County Hillside ,Elizabeth , Linden, Roselle fell into the pit as well.