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History · Cedar Knolls

Cedar Knolls’ post office opened in 1923

Most of Cedar Knolls was built recently: 3% of its homes predate 1940 and the median home dates from 1980. Below: maps from 1888 on.

1923first post office
0on the National Register
3%homes built before 1940
Add an old photoShare a memory
Photo: Joelincoln at English Wikipedia · Public domain
Quick answers

How Cedar Knolls began

When was Cedar Knolls founded?

1923

The Cedar Knolls post office opened in 1923, the earliest record of the town by name.

2020 census: 4,082103 years
Founding year: the first Cedar Knolls post office (Blevins & Helbock, CC0).

What stands out about Cedar Knolls’ past

Read from the archive, the National Register and the record. The page puts what stands out first.

A history waiting to be writtenNo old photos of Cedar Knolls are in the public archives yet. The rest are in attics and albums.On the map since 18887 editions of the USGS map, 1888 to 1981. Watch Cedar Knolls change.
★ What stands out · Help out

Start Cedar Knolls’s collection

The first neighbors to add old photos shape how Cedar Knolls’s history is told.

Decades since 1900 with photos
00s10s20s30s40s50s60s70s80s90s
0 of 10 decades. The empty ones are waiting for someone’s album.
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On the map

Cedar Knolls on the map, 1888 to 1981

Every edition of the U.S. Geological Survey’s map of Cedar Knolls. Tap a year, or press play to watch the town change.

Cedar Knolls on the 1888 USGS mapCedar Knolls on the 1894 USGS mapCedar Knolls on the 1906 USGS mapCedar Knolls on the 1947 USGS mapCedar Knolls on the 1954 USGS mapCedar Knolls on the 1970 USGS mapCedar Knolls on the 1981 USGS map1888Morristown sheet · 1:62,500

U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Cedar Knolls.

The story so far

Cedar Knolls, in brief

Wikipedia doesn’t have a history of Cedar Knolls yet. The photos, dates and memories neighbors add here are how it gets written.

Cedar Knolls is an unincorporated community located within Hanover Township in Morris County, in the U.S. state of New Jersey. It is part of Hanover Township along with Whippany. It was first listed as a CDP in the 2020 census with a population of 4,082.

Its first post office opened in 1923.

Intro from Wikipedia. Population: U.S. Census Bureau.

By decade

Cedar Knolls, decade by decade

Today1 recent
Cedar Knolls2017Cedar Knolls
Famous people

Famous people close to Cedar Knolls

Nobody well known was born in Cedar Knolls itself, so here are the best known from just nearby.

See all →
Peter DinklageAmerican actor · b. 1969
Jared KushnerAmerican businessman and real estate investor · b. 1990
Linda HuntAmerican actress · b. 1945
Artie LangeAmerican comedian · b. 1967
Jozy AltidoreAmerican soccer player · b. 1989
Jane KrakowskiAmerican actress and singer, comedian · b. 1968
Stories next door

History across the town line

Each neighbor’s History grade, on the same three inputs.

Hanover Township6 historic placesB+Morris Township13 historic placesAMorris Plains1 historic placeB−

Questions about Cedar Knolls’ history

What year was Cedar Knolls founded?

The Cedar Knolls post office opened in 1923, the earliest record of the town by name (U.S. post office records).

Memory lane

What the archives can’t tell you, neighbors can.

Town Square →
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Sources

Where this page comes from

Founding dates: Wikidata, Wikipedia, the U.S. post office records of Blevins & Helbock (CC0) and the Census. Homes by year built: Census ACS 2020–24. National Register of Historic Places: National Park Service (list of May 22, 2026). Old photos, postcards and papers: Wikimedia Commons, the Library of Congress and other public archives, credited on each item’s page. Maps: U.S. Geological Survey historical topographic maps (via Esri) and Sanborn fire-insurance maps (Library of Congress). History text and census tables: Wikipedia (CC BY-SA 4.0). Places that used to be: USGS Geographic Names Information System (2021). How TownRatings grades history →

From Wikimedia Commons (1) and U.S. Geological Survey historical maps. Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.