NYC Organizations and Clubs

New York City Audubon
https://www.nycaudubon.org
The American Littoral Society - NE chapter
https://www.littoralsociety.org/jamaica-bay.html
American Museum of Natural History
https://www.amnh.org
The Brooklyn Bird Club
http://brooklynbirdclub.org
City Island Birds
http://www.cityislandbirds.com
The Linnaean Society of New York
https://www.linnaeannewyork.org
Queens County Bird Club
http://www.qcbirdclub.org
Protectors of Pine Oak Woods
https://www.siprotectors.org
Staten Island Museum
https://www.statenislandmuseum.org

New York State and National Organizations

New York State Ornithological Association
http://www.nybirds.org
New York State Young Birders Club
https://www.nysyoungbirders.org
National Audubon Society
https://www.audubon.org
American Bird Conservancy
http://www.abcbirds.org
American Birding Association
http://www.americanbirding.org
eBird
http://www.ebird.org

Internet Bird Sightings Lists

eBirdsNYC (bird sightings for NYC area, not affiliated with eBird)
https://groups.io/g/ebirdsnyc
eBird Alerts (alerts you can set up through your eBird account)
https://ebird.org/alerts
The NY State Birding List (birding group for all New York State)
http://www.northeastbirding.com/NYSbirdsWELCOME.htm
North American Rare Bird Alert
http://www.narba.org