The Seven

Charleston County publishes a parcel layer carrying, for every property, its last recorded transfer and whether the owner claims it as a legal residence. Each of these seven subdivisions was resolved to a set of parcels by seeding from the assessor's own subdivision codes where they exist, rejecting geographic outliers, buffering the resulting envelope, and then classifying every street inside it against the assessor's neighborhood codes. The roster was re-sampled afterwards to check the match.

The known failure case:assessor subdivision tags cover only three of the seven cleanly, and one — Brickyard — has four tagged parcels sitting roughly fifteen miles apart, which would expand its envelope to most of the county if taken at face value. Laurel Hill Plantation is filed inside Brickyard's code family and was excluded by hand, which is why Brickyard reads 821 parcels against the HOA's own published 825.

What this is not:the county layer stores each parcel's most recent transfer only. A figure here describes the people who own these homes now — not a time series of what the neighborhood sold for, and not a price index.

Owner-occupancy, tenure and length-of-ownership statistics are also published at broader geographies by the U.S. Census Bureau's American Community Survey and are sold at parcel level by national data vendors. What is unusual here is the join: published per subdivision, matched parcel by parcel from recorded deeds, with the sample size shown and the failure cases named.