A county file is useful when it answers your actual research question. Before you buy, write down the location, fields, source-date requirement, and output you need. A land shortlist, an owner mailing list, and a GIS boundary layer require different checks.
1. Match the geography and record type
Check the county, state, record count, and parcel identifier. Ask whether the file represents tax parcels, property accounts, common lots, or condominium interests. Those records are not interchangeable. LandSight product pages explain their scope; the Ohio county directory links to individual samples and prices.
2. Separate source age from download age
A file retrieved this month can contain ownership information from an older source extract. New flood or wetland mapping does not refresh that ownership. Read the parcel and owner source dates separately from retrieval and enrichment dates. If your research needs recent ownership, make that requirement explicit before purchasing or requesting a custom extract.
3. Inspect missing fields before counting leads
A recorded owner name is not a verified decision-maker, telephone number, or email address. A tax mailing address may differ from the property address. Open the sample and check both column meaning and population. A five-row sample demonstrates format; it does not establish full-file completeness. Use the county's documented counts and coverage notes for that assessment.
4. Check boundaries and overlay coverage
Inspect the geometry, parcel IDs, and coordinate reference information needed for your GIS. For flood, zoning, and wetlands, distinguish no mapped overlap from missing source coverage. A county can include zoning fields while only part of its area has retrieved zoning polygons. A tax-use code is a separate attribute from a zoning district.
5. Choose a format your workflow can use
CSV supports tabular filtering and review. GeoJSON carries geometry and attributes into compatible mapping tools. Keep identifiers as text so leading zeros survive spreadsheet import. LandSight ready county downloads include CSV and GeoJSON; each product page identifies included fields, tools, and source notes. See the CSV and GeoJSON workflow guide.
6. Review the purchase scope
Confirm whether you are buying one county file, a prepared sector, a collection, or a custom service. Read permitted uses, delivery details, and correction terms on the specific product. Keep the order and methodology with your working copy. If a required field is absent, ask for a scoped review rather than assuming it is included.
Start with an actual sample
Find your county in the Data Shop, inspect its sample, and compare the coverage to your checklist. For ongoing ingestion, quality checks, and change monitoring, explore ParcelMetric software. For a project-specific output, use the sector research brief to define the work.