geonuts: An R package for mapping geolocations to European NUTS regions

Most European territorial data (e.g., Eurostat indicators) is published for regions defined by the Nomenclature of Territorial Units for Statistics (NUTS). The geonuts R package addresses the recurring research task of linking individual-level geolocation data—such as survey responses, firm locations, or mobility traces—to standardised NUTS regions (levels 0–3). The package implements vectorised point-in-polygon matching using Eurostat geospatial layers, with an optional nearest-neighbour fallback for points located near or outside polygon boundaries. The main contributions of the package are: (i) a simple, reproducible R interface for geolocation-to-NUTS assignment that integrates directly with existing spatial and data-access ecosystems, including sf , eurostat , and the broader tidyverse ; (ii) a flexible two-stage matching strategy with built-in diagnostic output covering boundary-edge and near-coastal cases; and (iii) a built-in visualisation function for rapid spatial validation of results. geonuts is available on CRAN, with source code hosted on GitHub.