Here’s what Pequannock looked like in 1887. It was much larger than today’s 7-square-mile area — it still included Bloomingdale, Butler, Kinnelon, and Lincoln Park. Jefferson had split off in 1804, Rockaway Township in 1844, and Boonton and Montville took their leave in 1867.
Butler kicked off the 20th Century by declaring itself a new borough in 1901, while Kinnelon and Lincoln Park went their separate ways in 1922.
Riverdale Borough followed in 1923.