We used vessel-based observations from the Gulf of Mexico Marine Assessment Program for Protected Species (GoMMAPPS) to identify and characterize distinct bird assemblages in the northern Gulf of America (within the U.S. EEZ; aka Gulf of Mexico, hereafter nGulf). Vessel-based surveys documented the date:time, location, species, and number of birds across the nGulf between 2017–2019. Though our surveys specifically targeted seabirds, we also collected observational data for myriad species of non-marine avifauna. Data were collected following standardized strip transect protocols for seabird observations from vessels. All data were entered in real-time onto a Panasonic Toughbook™ using Program SEEBIRD (Vers. 4.3.7) software. Observations occurred over 293 days-at-sea representing ~2,300 hrs of observer effort covering ~41,700 transect km. We had 1,345 records of 6,977 individuals representing 77 species classified as non-marine avifauna. Records classified as non-marine avifauna accounted for 12.6% of all avifauna detections, 13.7% of all individual birds, and 63.1% of all avifauna identified to species. Landbirds were the most frequently detected guild of non-marine avifauna based on species richness (~62%), number of detections (~61%), and number of individuals (~53%). Despite comparable levels of survey effort in spring, summer, and fall, ~70% of non-marine avifauna were observed in fall (September – November). Interest in GoMMAPPS seabird survey data remains high by both regulatory agencies and the broader nGulf bird conservation community, particularly as it relates to proposed offshore energy and aquaculture development.