To cite package ‘nyczips’ in publications use:

  Healy K (2025). _nyczips: New York City ZIP Code Data_. R package
  version 0.1.0, <https://github.com/kjhealy/nyczips>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {nyczips: New York City ZIP Code Data},
    author = {Kieran Healy},
    year = {2025},
    note = {R package version 0.1.0},
    url = {https://github.com/kjhealy/nyczips},
  }