Please note that Newark included Bloomfield Township until 1812, and Caldwell Township until 1798, so depending on the dates of the business listings you saw, they may or may not have been in modern-day Newark. Present-day Newark and the southern part of Bloomfield were predominantly English until the early 1800s, while northern Bloomfield (Speertown, Stone House Plains et al.) and much (all?) of Caldwell were essentially overgrowth of Dutch Bergen and Passaic Counties. Even after 1800, the mixing of the Dutch and English communities was gradual. By the early-mid 1800s, though, there was quite a bit of mixing.