How reliable is property data from private companies vs. county records?

County records are the original source of truth for deeds, liens, assessments, and tax data, but they are raw, unstandardized, and vary by jurisdiction. Many public records are only available as document images, and useful data must be abstracted through optical character recognition or human data entry. Private data companies add value by normalizing records across 3,000+ counties, abstracting data from document images, and layering in third-party data and modeled insights that do not directly exist in the raw public records.

Neither source is perfectly reliable. County records can contain errors, omissions, formatting differences, and delays. Private companies inherit those same issues and introduce their own risks through matching algorithms, modeling assumptions, and ingestion timing. The practical difference is that county records give you the official filing, while private companies give you a searchable, enriched, cross-referenced version of that filing. PropertyRadar's internal method is described as multi-sourced, baked-off, backtested, and backfilled, meaning data from multiple sources gets compared and the most reliable version wins. The strongest approach for important decisions (buying, selling, lending) is to verify private-company data against the original county record before acting.