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Netcong is the fastest-growing town in Morris County this decade. The borough’s population rose an estimated 16.3 percent between April 2020 and July 2025, from 3,373 to 3,924 residents, according to Shop Morris County’s analysis of the U.S. Census Bureau’s newest Vintage 2025 city and town population estimates. Florham Park is a close second at 15.1 percent, and the county as a whole is estimated at 524,251 people, up 14,958 (2.9 percent) since 2020.
The growth is broad. Of Morris County’s 39 municipalities, 38 are estimated to be larger than they were in 2020. Madison is the only town estimated slightly below its 2020 base, at 16,607 residents.
The fastest-growing towns since 2020
Ranked by percentage change from the April 2020 estimates base to July 1, 2025: Netcong, up 16.3 percent (3,373 to 3,924); Florham Park, up 15.1 percent (12,563 to 14,456); Rockaway Township, up 9.3 percent (25,358 to 27,728); Montville, up 9.0 percent (22,445 to 24,469); Chatham Borough, up 8.9 percent (9,204 to 10,027); Morris Plains, up 7.2 percent (6,145 to 6,586); Wharton, up 5.3 percent (7,238 to 7,618); Mine Hill, up 3.9 percent (4,004 to 4,160); Mountain Lakes, up 3.9 percent (4,475 to 4,649); and East Hanover, up 3.2 percent (11,103 to 11,457).
The biggest gains in raw numbers
Counting people instead of percentages, Rockaway Township added the most residents of any Morris County town, about 2,370 since 2020. Montville added about 2,024, Florham Park about 1,893, Chatham Borough about 823 and Morris Township about 731.
Rockaway Township’s gain has also reshuffled the top of the list. In the 2020 base, Randolph (26,460) was larger than Rockaway Township (25,358). The 2025 estimates put Rockaway Township at 27,728 and Randolph at 26,878, making Rockaway Township the county’s third-largest municipality.
Who grew the most in the last year
Between July 2024 and July 2025, Rockaway Township again led with an estimated 883 new residents, a 3.3 percent jump in a single year. East Hanover added 275 (2.5 percent), Wharton 193 (2.6 percent), Randolph 187 and Denville 140. Countywide, Morris County grew by about 2,896 people in that year.
Morris County’s largest towns in 2025
Parsippany-Troy Hills remains the county’s biggest municipality at 56,633 residents, followed by Mount Olive (29,503), Rockaway Township (27,728), Randolph (26,878) and Montville (24,469). Victory Gardens is still the smallest at 1,596. For a quick look at all 39, see our guide to every town in Morris County.
How we compiled this
We pulled every Morris County municipality from the Census Bureau’s Vintage 2025 subcounty population file and compared each town’s July 1, 2025 estimate with its April 1, 2020 estimates base and its July 1, 2024 estimate. The Census Bureau released these estimates in May 2026, as noted in its release announcement. They are modeled estimates, not a new head count, and the bureau revises prior years each time it publishes a new vintage, so numbers can shift slightly from earlier releases.
Netcong’s gain works out to about 551 more residents, the biggest percentage jump in the county for one of its smallest boroughs. If you are new to town, our guide to things to do in Netcong is a good place to start.
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