2 snapshots on file, newest January 2022.
Archive vintage
4 years old
10,316 parcel features, 40 attributes, 77% weighted attribute fill. Reprojected to WGS 84 (EPSG:4326); geometries repaired where invalid. Point-in-time snapshot. No cross-county schema normalisation.
Each row is a distinct point-in-time snapshot of Cook County, not a revision of one file. Parcel counts move between vintages for real reasons — subdivision, consolidation, annexation, a re-survey — so a jump in the count is information rather than an error. This county's record here spans June 2015 to January 2022.
Archive vintages are released once they are old enough to be non-competitive; community vintages are contributed by users and published as soon as they pass verification. Both are free.