rocket21 contacted me to give me a URL with a list of NE areas on public land: 

http://www.newenglandskihistory.com/topics/publicland.php<div> </div><div>It only includes New England, so other additions from NY, PA and NJ are still welcome.

</div>

Here is the updated list summary #2. (summary to the NE United States.)

Federal Government:

NY: West Point; Victor Constant Ski Area

State:

MA:

MDC (became DCR): Blue Hills (leased out)

Wachusett (leased out)

NH:

Cannon

Sunapee (leased out)

NY:

Belleayre

Gore

Whiteface

PA:

Laurel Mountain (leased out and run by 3rd party)

Ski Denton (Owned by PA, but not currently operating).

County:

NH: Belknap: Gunstock

NJ: Bergen County: Campgaw (leased out and run by 3rd party)

City/Town:

MA: Pittsfield: Osceola Park Rope Tow

ME: Camden: Camden Snowbowl

ME: Pinnacle

ME: Powderhouse Hill

ME: Spruce

NH: Wolfeboro: Abenaki

NH: Claremont: Arrowhead

NH: Franklin: Veterans Memorial Ski Area

NH: Kancamagus Rec.

NH: Lebanon: Storrs Hill (heavily funded by the city, but not owned by the city)

NH: Lyndon: Lyndon Outing Club

NH: Manchester: McIntyre (leased out and run by 3rd party) [updated as per remski’s comment below]

NH: Mt. Eustis

NH: Prospect

NY: Chestertown: Dynamite Hill,

NY: Indian Lake: Indian Lake

NY: Newcomb: Newcomb

NY: Saranac Lake: Mt. Pisgah

NY: Schroon Lake:Schroon Lake Ski Tow

VT: Bellows Falls: Rockingham Rec

VT: Brattleboro: Living Memorial

Got more?

Note: (5/2/2018 edit) VT: St. Albans: Hard’Ack: Removed from list: non profit, not a municipal