To cite package ‘usmap’ in publications use:

Di Lorenzo P (2026). usmap: US Maps Including Alaska and Hawaii. R package version 1.0.0.9000, https://github.com/pdil/usmap.

Corresponding BibTeX entry:

  @Manual{,
    title = {usmap: US Maps Including Alaska and Hawaii},
    author = {Paolo {Di Lorenzo}},
    year = {2026},
    note = {R package version 1.0.0.9000},
    url = {https://github.com/pdil/usmap},
  }