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Mahlon Dickerson Reservation in Jefferson Township is the biggest park in Morris County’s county park system, covering 3,587.4 deeded acres, according to the Morris County Park Commission’s park and trail overview. It is nearly 1,400 acres larger than the next park on the list, and it is one of 42 properties that add up to 20,520 acres of county parkland and 250.3 miles of trails.
The Park Commission describes itself as the largest county park system in New Jersey based on acreage. It was established in 1956 by voter referendum and reports more than 5.4 million visits a year. Here are the 10 largest parks and facilities, ranked by acreage, with trail miles from the same table.
1. Mahlon Dickerson Reservation, Jefferson: 3,587.4 acres
955 Weldon Road, Jefferson Township. 26.8 trail miles, including the hike to Headley Overlook, which the Park Commission calls one of the highest points in Morris County. Seasonal tent and RV camping runs April to November.
2. Lewis Morris County Park, Morris Township: 2,213.0 acres
270 Mendham Road, Morris Township. 24.6 trail miles, plus Sunrise Lake, athletic fields, a dog park and group camping. It was the system’s first park, dedicated in 1958.
3. Pyramid Mountain Natural Historic Area, Montville: 1,678.9 acres
Visitor center at 472 Boonton Avenue, Montville Township. 19 trail miles lead to Tripod Rock, Bear Rock and Whale Head Rock, glacial boulders left more than 18,000 years ago. The park’s high point is 934 feet.
4. Silas Condict County Park, Kinnelon: 1,513.4 acres
100 Kinnelon Road, Kinnelon. 9.6 trail miles, a seven-acre lake and the historic stone Casino building.
5. Loantaka Brook Reservation, Morris Township: 892.2 acres
468 South Street, Morris Township. 9.6 trail miles of mostly flat greenway through Morris Township, Chatham Township, Madison and Harding, popular for cycling and jogging.
6. Passaic River County Park, Chatham Township: 856.0 acres
791 River Road, Chatham Township, with a separate Clover Hill section in Long Hill. More than 5,000 feet of Passaic River frontage for fishing and canoe launching.
7. Schooley’s Mountain County Park, Washington Township: 823.0 acres
91 East Springtown Road, Washington Township. 9.3 trail miles by the Commission’s table, George Lake, a floating bridge and The Lodge.
8. Elizabeth D. Kay Environmental Center, Chester: 821.8 acres
200 Pottersville Road, Chester. 7.6 trail miles through meadows and a hemlock gorge along the Black River, part of a preserved complex of more than 1,600 acres.
9. Bamboo Brook Outdoor Education Center, Chester Township: 687.2 acres
170 Longview Road, Chester Township. 8.0 trail miles and gardens designed by landscape architect Martha Brookes Hutcheson, listed on the New Jersey and National Registers of Historic Places.
10. James Andrews Memorial County Park, Randolph: 595.7 acres
Parking off Millbrook Avenue, Randolph. 4.3 trail miles that connect to Randolph’s municipal trail system and Patriots’ Path. Its first parcel was donated in 1956, the year the Park Commission was formed, and the park was dedicated in 1960.
Which towns hold the most county parkland
The Commission also breaks down publicly accessible acreage by municipality. Jefferson leads with 3,991 acres, followed by Kinnelon (2,322), Chester Township (2,041), Morris Township (1,552) and Randolph (1,142). Patriots’ Path, the long-distance trail, holds 52.7 trail miles on its own property and runs 73.4 miles in total including shared trail.
How we compiled this
We ranked every property in the Park Commission’s Park and Trail Overview (dated December 19, 2025) by deeded acres, which the Commission bases on the state’s Green Acres Recreation and Open Space Inventory, then confirmed addresses on each park’s own page. Tourne County Park (561.1 acres) and Jonathan’s Woods (559.6 acres) just miss the top 10. Ready to get out there? See our picks for the best hiking trails in Morris County and our list of Morris County waterfalls.
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