To cite package ‘usmapdata’ in publications use:

Di Lorenzo P (2026). usmapdata: Mapping Data for 'usmap' Package. R package version 1.0.0.9000, https://github.com/pdil/usmapdata.

Corresponding BibTeX entry:

  @Manual{,
    title = {usmapdata: Mapping Data for 'usmap' Package},
    author = {Paolo {Di Lorenzo}},
    year = {2026},
    note = {R package version 1.0.0.9000},
    url = {https://github.com/pdil/usmapdata},
  }