Denville, NJ ZIP Code, County and Quick Facts (2026)

Updated October 2026. The Denville NJ ZIP code is 07834, and Denville is in Morris County, roughly at the center of the county. Below are the rest of the quick facts people look up about Denville Township: population, size, who runs the town, which schools kids attend, how to get to New York, and how the town came to be.

Every figure here comes from the U.S. Census Bureau, the Township of Denville’s official site or another primary source, checked in October 2026. For town hall services, see our Township of Denville hub. Thinking about a move? Our moving to Denville guide goes deeper on neighborhoods, taxes and daily life.

Quick facts

• ZIP code: 07834 (Mount Tabor section: 07878)
• County: Morris County, New Jersey
• Area code: 973 (with the 862 overlay)
• Population: 17,107 (2020 Census); 17,424 (Census Bureau estimate, July 1, 2025)
• Area: 12.74 square miles total, 11.99 square miles of land
• Incorporated: April 14, 1913, from Rockaway Township
• Government: Mayor and seven-member township council (Faulkner Act mayor-council)
• Mayor: Thomas W. Andes, in office since 2012, term through 2027
• Schools: Denville Township School District (pre-K to 8), Morris Knolls High School
• Train: NJ Transit Denville station, Morristown Line and Montclair-Boonton Line
• Highways: I-80, U.S. Route 46, Route 10 and Route 53
• Distance to New York City: about 35 miles west of Manhattan

Denville ZIP code and mail

Most of Denville uses ZIP code 07834. The Denville Post Office is at 18 Church Street, just off the downtown core. One exception trips people up: the historic Mount Tabor section of the township has its own post office at 26 Simpson Avenue and its own ZIP code, 07878. If you are filling out a form for a Mount Tabor address, use 07878.

Address: 18 Church St, Denville, NJ 07834
Mount Tabor Post Office: 26 Simpson Ave, Mount Tabor, NJ 07878

What county is Denville, NJ in?

Denville is in Morris County, in northern New Jersey. Because the township sits near the geographic center of the county, where I-80, Route 46, Route 10 and Route 53 meet, it has long been known as the Hub of Morris County. It borders Mountain Lakes and Parsippany-Troy Hills to the east, Morris Township and Randolph to the south, Rockaway Borough and Rockaway Township to the west and north, and Boonton Township to the north and east.

Population and households

The 2020 Census counted 17,107 people in Denville, the township’s highest decennial count and up 472 from 16,635 in 2010. The Census Bureau’s latest annual estimate (Vintage 2025) puts the population at 17,424 as of July 1, 2025. According to the Bureau’s 2020 to 2024 American Community Survey figures, Denville averages 2.75 people per household, the median household income is $160,817, the median value of an owner-occupied home is $564,600, and 61 percent of adults 25 and older hold at least a bachelor’s degree. Source: U.S. Census Bureau QuickFacts.

Size and geography

Denville covers about 12.74 square miles, of which 11.99 square miles is land and roughly 0.75 square miles is water. That water is a big part of the town’s identity. Denville has four private membership lake communities, Cedar Lake, Indian Lake, Rock Ridge Lake and Lake Arrowhead, developed about a century ago as summer colonies for city families. The Rockaway River and the Den Brook run through town. See our lakes, parks and trails guide for public places to get outside.

Government and mayor

Denville uses the Faulkner Act mayor-council form of government. Voters elect a mayor and a seven-member township council to four-year terms in partisan elections held in odd-numbered years: four council members represent the township’s four wards, and three serve at large. The current mayor is Thomas W. (Tom) Andes, who took office January 1, 2012, and whose term runs through December 31, 2027. Town hall is the municipal building at 1 Saint Mary’s Place; our municipal building hours and phone numbers guide lists each department.

Address: 1 Saint Mary’s Place, Denville, NJ 07834
Phone: (973) 625-8300
Website: denvillenj.gov

Schools

Public school students from pre-K through grade 8 attend the Denville Township School District: Lakeview Elementary School, Riverview Elementary School and Valleyview Middle School (grades 6 to 8). For high school, Denville students go to Morris Knolls High School in Rockaway, part of the Morris Hills Regional High School District. Our Denville schools guide has addresses, principals and hours.

Getting around: train and highways

Denville station is a large three-platform NJ Transit stop served by both the Morristown Line and the Montclair-Boonton Line, with Midtown Direct trains to New York Penn Station and service to Hoboken Terminal. Trip times vary by train, so check the NJ Transit timetable for your departure. Our Denville train station parking guide covers permits and daily parking.

By car, Interstate 80, U.S. Route 46, Route 10 and Route 53 all pass through Denville, and Interstate 287 is a few minutes east in Parsippany. Manhattan is about 35 miles to the east.

A short history

Lenape people lived and hunted in the area long before Dutch and English settlers arrived in the late 1600s. In the 1700s, iron forges along the Den Brook and the Rockaway River drove the local economy and supplied munitions during the Revolution; General William Winds, one of George Washington’s generals, was a Denville resident. The Morris Canal came through in the early 1830s, and the railroad followed, drawing families to settle near the depots at Denville and Mount Tabor.

For most of its early history Denville was the southern district of Rockaway Township. By 1912, farmers tired of paying Rockaway Township taxes pushed to separate, and on April 14, 1913, Governor Fielder signed the act creating Denville Township. That year the new town had 62 registered voters, about 58 farms and 230 houses. Nobody is certain where the name comes from: one theory credits explorer Daniel Denton, another the animal dens in the swampy meadows along the Den Brook. The township’s official history page has much more.

Today Denville’s largest employer is Saint Clare’s Denville Hospital on Pocono Road, and its downtown along Broadway, Main Street and Diamond Spring Road is known for independent shops and restaurants.

Frequently asked questions

What is the ZIP code for Denville, NJ?

Denville’s ZIP code is 07834, served by the Denville Post Office at 18 Church Street. Homes in the Mount Tabor section of the township use the Mount Tabor ZIP code, 07878.

What county is Denville, NJ in?

Denville is in Morris County, New Jersey. It sits near the center of the county, which is why it has long been called the Hub of Morris County.

What is the population of Denville, NJ?

The 2020 Census counted 17,107 residents in Denville Township. The Census Bureau’s most recent estimate puts the population at 17,424 as of July 1, 2025.

Who is the mayor of Denville, NJ?

Thomas W. (Tom) Andes has been mayor of Denville since January 1, 2012. His current term runs through December 31, 2027.

How far is Denville from New York City?

Denville is about 35 miles west of Manhattan. NJ Transit trains from Denville station run to New York Penn Station on Midtown Direct and to Hoboken.

When was Denville founded?

Denville Township was created on April 14, 1913, when Governor Fielder signed the act separating it from Rockaway Township.