3 snapshots on file, newest June 2022.
Archive vintage
4 years old
381,898 parcel features, 52 attributes, 88% weighted attribute fill. Reprojected to WGS 84 (EPSG:4326); geometries repaired where invalid. Attribute fill rates measured on a 200,000-feature sample. Point-in-time snapshot. No cross-county schema normalisation.
Each row is a distinct point-in-time snapshot of Contra Costa 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 October 2016 to June 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.