“Chelseaite” is the name of an inhabitant of Chelsea, in the borough of Manhattan. The name “Chelseaite” has been cited in print since at least 1935.
 
An inhabitant of Chelsea has also been called a “Chelsean” (cited in print since at least 1939).
 
   
Wikipedia: Chelsea, Manhattan
Chelsea is a neighborhood on the West Side of the borough of Manhattan in New York City. The district’s boundaries are roughly 14th Street to the south, 30th Street to the north, the western boundary of the Ladies’ Mile Historic District – which lies between the Avenue of the Americas (Sixth Avenue) and Seventh Avenue – to the east, and the Hudson River and West Street to the west. To the north of Chelsea is the neighborhood of Hell’s Kitchen, also known as “Clinton,” to the northeast is the Garment District, to the east are NoMad and the Flatiron District, to the southwest is the Meatpacking District and to the southeast is the West Village.
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The neighborhood is primarily residential, with a mix of tenements, apartment blocks, city housing projects, townhouses and renovated rowhouses, and its many retail businesses reflect the ethnic and social diversity of the population. The western part of Chelsea has become a center of the New York art world, with many art galleries located in both new buildings and rehabilitated warehouses.
 
Old Fulton NY Post Cards
30 May 1914, New York (NY) Tribune, “A London Neighborhood: Chelsea, Its History and Its Celebrities,” pg. ?, col. 3:
The name of Mary Astell, too, is little known, whether as a Chelseaite or otherwise.
     
Google Books
Old Chelsea and Saint Peter’s Church:
The Centennial History of a New York Parish
By Samuel White Patterson
New York, NY: The Friebele Press
1935
Pg. 99:
St. Peter’s ancient iron railing was piled high with the white silence and the rectory steps were withdrawn from the wondering eyes of any Chelseaites who braved the storm.
 
15 May 1979, New York (NY) Times, “Chelsea Persists as Ethnic Family Patterns Fade; Immigrants Drawn by Jobs”:
Chelseaites fear further disruption in the plan to the West Side Highway into the Westway, which, they say, will unnecessarily bring in more strangers.
 
Google Books
16 July 1984, New York magazine, pg. 2 ad:
Where
Eastsiders and Westsiders
Uptowners and Downtowners
Sohoers and Nohoers
Murray Hillians and Tudor Citians
Tribecians and Sutton Placians
Central Parkers and Gramercy Parkers
Hell’s Kitchenettes and Brooklynettes
Chelseaites and Riverside Drivers
(...)
American Festival Cafe
at Rockefeller Center
 
16 December 1987, Newsday (Long Island, NY), “Dining” by Molly O’Neill, Food, pg. 5:
Tweedy and gently graying Chelseaites reserve tables days in advance and then wait (sometimes for up to half an hour) at the restaurant’s dark wood bar until those tables are ready.
 
Google Books
Water Under the Bridge
By Margarette De Andrade
Rutland, VT: C.E. Tuttle Co.
1988
Pg. 100:
The entire block between Twentieth and Twenty-first Streets and Ninth and Tenth Avenues was given for the construction of the Seminary by a well beloved Chelseaite, Clement C. Moore.
 
Google Books
Newcomer’s Handbook for Moving to New York City
By Belden Randolph Merims
Portland, OR: First Books
2001
Pg. 39:
Chelseaites and Villagers shop Chelsea Market for quality foods in the imaginatively recycled Nabisco factories on Ninth Avenue and 15th Street.
 
Hotel Chelsea Blog
April 17, 2007
Two-Book Party for Renowned Chelseaite
Stefan Brecht, who lives in the Village, kept a studio in the Chelsea Hotel throughout the seventies, eighties and nineties.