I've seen these maps once before. Tremendous resource, glad it is online. I wish we knew what streets were paved with cobblestones, what streets were ashes or crushed stone, and what streets were just "paper streets", meaning they were on the map, but didn't actually exist. I suspect Third Street was one of these, also a lot of the side streets on the Cherry Hill map.
Sheet 3 is most interesting, and to read between the lines to gather information. Even some of the smallest houses on Hudson Street have the person's name written down. But look at all the small houses WITHOUT person's names, even where there is space to print them. I think these were African-American residences, and the map author thought it not befitting to even mention the person's names. See the corner of Prospect & Berry Street, same pattern, and we know for certain that those were residences of African-Americans. Other documents refer to that street corner, in this time period.
Look at the brooks running through the central part of Hackensack. Look at how Central Ave used to angle across the railroad, I suspect it being a paper street there.
Look at how some houses on Main or State Street own land all the way to Coles brook.
Look at how few last names there are, just a handful of prominent families really owned this city.
Also of note, the boundary of the "Hackensack Commission" at times went outside of the boundaries of New Barbadoes Township, specifically the area south of Essex Street and west of Polifly Road. Note also that the boundary of the Hackensack Commission ran straight down the middle of Fairmount Ave all the way to Coles Brook. Meaning that "Fairmount" was only north of Fairmount Ave. Wish we had the map for that one posted online. I've also seen it, it showed the Fairmount Hotel, the Zingsem estate, and many fine homes on Elm Ave.