Do you say Derry or Londonderry?

both correct , use both, more derry because it's faster , quicker in direct conversation.

if i'm writing, particularly official-like write londonderry. change depending on i'm talking to, example if knew prefer derry derry.

doesn't bother me ever, bother me crap people make it. it's name, people should respect fact people can call either way, whichever prefer.

for town in northern ireland.

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