I came across the DC Corporations Listing, which includes all the cooperatives registered in DC since the 1800s. It is an enormous list because it also includes cooperatives outside the District. DC had very open co-op laws. I’ve been adding the cooperatives to the Coop DC directory. Lots of interesting cooperatives from the past!
Let me know if you want to add any cooperatives to the list or if you have info about existing or former cooperatives. It would be nice to have some descriptions about what it was like shopping at Fields of Plenty or at Bread & Roses Community Music Center/Cooperative (“An anti-capitalist, collectively run record shop” at 1724 20th St, NW).