Maryland Ornithological Society:Activities, checklists for Maryland and DC, bird programs, list of hotspots, rare bird photo gallery, guide to hawk watching sites, bird count results, publications, and Maryland/District of Columbia Records Committee reports and lists.
Allegany County Bird Club: Events, sanctuary map, recent sightings, and birding quiz.
Assateague Birdwatching: General overview.
Baltimore Bird Club: Rare bird alerts, newsletters, site guides, trip reports, checklist, backyard birding, and many links.
Bird Checklists: Seasonal checklists for 9 refuges in Maryland.
Birding in Kent County: Kent County Chapter of MOS. Events, birding sites, count results, and checklist.
Calvert County Birding Spots: Offers guides to six areas. Includes descriptions, hours, admission information, and directions.
Cecil Bird Club: The Ornithological Society of Cecil County. Events, Turkey Point Hawk Watch, county checklist, and site guides to 12 Cecil County hotspots.
Frederick County Chapter: Chapter of Maryland Ornithological Society with details of two rarities.
Harford Bird Club: Newsletters, field trips, checklists, count results, and a site guide for Conowingo Dam.
Howard County Bird Club: Field trips, events, a checklist, county birders' lists, and photo gallery. Also includes checklists for the area's insects and wildflowers.
Mary Scott's Birding Maryland: Travelogue and photos of 11 Maryland birding spots.
Maryland Osprey: Subscription information and archives for the mailing list for discussion of birds and birding in Maryland.
MD Bird Photos: Photo gallery of birds found in central Maryland by June Tveekrem.
MDOsprey Archives: Searchable archives of the Maryland birds and birding e-mail group.
Montgomery County Chapter: Chapter of MOS with news and events, newsletters, and site guides.
The Nest Box: Information about backyard birding, descriptions of Calvert County birding spots, count results, photo gallery, and other resources.
Worcester County Birdwatching: Birding sites, seasonal abundance checklist, and birding events for Maryland's only coastal county.