Reference Data and Helpers for Small Island States and Territories R package islandcodes version 0.2.0 A curated reference list of countries and territories with classifications for Small Island Developing States (SIDS), sub-national island jurisdictions (SNIJ), World Bank region and income group, and political association. Sub-sovereign cases such as Aruba, Curacao, Bonaire, Sint Maarten, the French overseas territories, and Aaland Islands are represented with disambiguating codes that standard country-code packages often collapse or omit. Provides predicate helpers and a tidy joiner intended to extend rather than replace 'countrycode'. Source data is maintained at <https://github.com/University-of-Aruba/island-research-reference-data> and licensed CC BY 4.0. Software Depends: R (>= 4.1.0) Imports: countrycode (>= 1.5.0) Suggests: dplyr, tibble, knitr, rmarkdown, testthat (>= 3.0.0) Rendell de Kort <rendell.dekort@ua.aw> Comprehensive R Archive Network (CRAN) Rendell de Kort [aut, cre] (ORCID: <https://orcid.org/0009-0006-5402-0500>), University of Aruba [cph, fnd] (Digital Competence Dutch Caribbean (DCDC) Network) CC BY 4.0 2026-07-06 application/tgz https://CRAN.R-project.org/package=islandcodes doi:10.32614/CRAN.package.islandcodes