Passaic's only land border is Clifton — Garfield, Wallington, Rutherford and East Rutherford all sit across the Passaic River, reached by the Monroe Street, Passaic Street, Gregory Avenue, Market Street, Eighth Street and Union Avenue bridges.
Continuous mixed-use blocks: ground-floor retail with apartments above, built wall-to-wall with shared party walls and parapets rather than standing as separate buildings.
Passaic's principal commercial spine, lined with older multi-storey buildings in a continuous street wall, many carrying low-slope roofs behind decorative street-facing parapets.
The section of Passaic known for its larger houses in a range of period styles, Queen Anne and Tudor among them, on bigger lots than the rest of this very dense city allows.
The east side of the city, which filled in quickly once water power drew the mills in -- built as dense worker housing on small lots and largely still in that form.
The last part of Passaic to develop -- it was considered too far from the rest of town to be desirable -- so its housing skews slightly later than the city core while still sitting well inside the pre-war era.
The oldest of the city's prestige sections, developed from the middle 1870s with substantial houses built for the people who ran the mills.
The residential blocks around the park carry the same dense pre-war stock found across central Passaic -- closely set two- and three-family houses with limited separation between them.
The blocks running along the river, historically the city's industrial edge, now a mix of older residential and former industrial buildings.
Population, land area and housing-unit figures are 2020 census counts.
Far larger and markedly less dense than Passaic, and built out in distinct named sections -- Allwood, Athenia, Botany Village, Delawanna, Lakeview, Montclair Heights, Richfield and others -- each developed at a different time, so the housing stock varies sharply from one to the next.
A small, very densely built city -- over fifteen thousand people to the square mile -- with named pockets including Belmont, Bogart Heights, Plauderville and the Dundee Dam area.
Under a square mile of land carrying nearly twelve thousand people -- one of the most tightly built boroughs in the area, and one of the highest concentrations of Polish ancestry anywhere in the state.
Noticeably less dense than the river towns directly opposite Passaic, with a substantial stock of older detached houses -- enough surviving period architecture to support five National Register listings.
Low density by the standards of this area -- under three thousand per square mile -- with a mix of older borough housing and a large share of land given over to commercial and stadium-district use.
Twenty-six thousand people on just over two square miles, in a stock that runs heavily to two-family houses and small apartment buildings.
Moderately dense by local standards, with a stock weighted toward single-family and two-family houses on regular lots rather than the wall-to-wall building found in Passaic itself.
A township rather than a dense borough, at around five thousand per square mile, with a stock dominated by detached post-war houses.
Under two thousand people per square mile across nearly four square miles -- a small residential core surrounded by a large amount of commercial and warehouse property.
Ten thousand people on barely a square mile, mixing older borough housing with substantial newer residential development on former industrial land.
Spread across four and a half square miles at moderate density, with a long river frontage and a stock running from older river-side housing to later suburban development inland.
Moderately dense borough housing on sloping ground, with a stock weighted to modest detached and semi-detached houses.
Thirty thousand people on three and a third square miles, in a stock with a strong share of older detached and two-family housing on established tree-lined streets.
Densely built at over eleven thousand per square mile, with a large stock of two- and three-family houses of the same era and form as Passaic's.
Over fifty thousand people and nearly twenty thousand housing units across five and a third square miles -- large enough that its neighbourhoods differ from one another as much as Clifton's do.
By far the largest municipality in this service area -- nearly a hundred and sixty thousand people at almost nineteen thousand per square mile, with close to forty-eight thousand housing units.
Moderate density on three and a third square miles, with a stock running mainly to detached single-family housing.
Low density across four square miles -- around two and a half thousand per square mile -- with a mix of detached residential and a significant amount of commercial property.
Moderate density across two and four-fifths square miles, with a stock mixing older river-side housing and later development on higher ground.