District level boundary data in 2020, repaired using 2015 historical adjacency evidence and 2020 geometry only. Original attributes and row order are retained. Polygon overlaps are removed and the Guro/Yeongdeungpo/Dongjak/Gwanak junction is one shared point. Eight unresolved historical reference pairs and two historically unconfirmed contacts remain documented for review.
Format
An sf object with 250 rows and three fields: year, adm2_code,
and geometry. Coordinates use EPSG:5179.
Details
Validated 2010, 2015 and 2025 boundaries are registered datasets in
the companion tidycensuskr.sf package; load_districts() selects their
package automatically. Codes can be used to join anycensus() output.