Parker River National Wildlife Refuge
- Official web site of PRNWR at Plum Island in Essex County, Massachusetts. Refuge is managed for wildlife, and is known for birding, surf fishing, clamming, and great example of coastal ecosystem.
- http://www.fws.gov/northeast/parkerriver/

Plum Island
- Directory of local business, government, services and events, with discussion board and chatroom.
- http://www.plum-island.com/

Plum Island and Parker River National Wildlife Refuge
- Photos and descriptions of birds to be found on the island. Provided by Birding America.
- http://www.birdingamerica.com/Massachusetts/plum_island.htm

Plum Island Hawk Watch
- Follow a hawk's flight, review migrations from past years and check out panoramic views of the island.
- http://www.hawksaloft.com/plum/

Plum Island, Massachusetts
- General information plus list of birds spotted on the island, as well as links to local and related sites.
- http://world.std.com/~jegan/plum.html

Plum Island Sound Long-Term Ecological Research Site
- Project overview and data, including maps, descriptive summaries, photographs, watershed and marsh information.
- http://ecosystems.mbl.edu/PIE/