Columbiana County, Ohio parcel research. Generated 2026-09-22T19:41:36.771494+00:00.

RECORDS AND OWNERS: All 74,627 records from the stated official parcel selection; 73,403 contain recorded owner names. County public owner records joined by exact statewide parcel ID. Conflicting owner rows remain unknown. Dates are retained separately for boundaries, owners and retrieval. Retrieval today does not refresh an older source snapshot. Duplicate local parcel identifiers can represent multiple geometry records; record_id is unique. Public ownership entries are not verified legal title or sale listings. Mailing addresses are tax-record entries, not permission to contact. source_land_area retains the source value without assuming units; computed_screen_acres is measured from the mapped polygon. Tax class is not zoning.

GEOMETRY: Original valid parcel polygons preserved. Invalid or absent parcel geometry receives null analytical results. Every valid parcel representative point checked against its named official county boundary with100m tolerance; unreviewed mismatches block publication. Individually reviewed county-boundary disagreements are quarantined with null analysis and original geometry retained in a separate exception file. Overlay invalid polygons may be made valid, with repair count retained. Areas and shortest distances use EPSG26917. Parcel boundaries are not surveys.

FLOOD: Full parcel polygons intersect the complete retrieved FEMA NFHL county layer. Overlaps under1square meter omitted. Areas are unions, preventing double counting. All percentages use FULL parcel area as denominator. fema_mapped_pct measures retrieved mapping coverage. sfha_pct measures overlap where FEMA SFHA_TF=T. Partial mapping leaves the remaining parcel area unknown; no mapping or no usable geometry yields blank SFHA results. Zero known overlap is not a guarantee against flooding. Zone subtypes, floodway measures and available static base-flood elevations with units/datums are retained. Missing FEMA sentinel values stay null. Per-feature evidence preserves source identifiers and citations. This is GIS screening, not a lender flood certificate.

SCHOOLS: NCES2024-25 active, nonvirtual public-school locations within Ohio and Census ACS2024 Ohio unified districts. The nearest-school search is limited to Ohio schools; schools in neighboring states are outside this search. Distance is the shortest straight line from parcel to mapped school. Nearest school does not establish attendance assignment, enrollment or school quality.

SCOPE: This edition includes recorded ownership, source property fields, FEMA and school mapping. Current zoning overlays, utility capacity, legal access, permitted use, vacancy, title, availability for sale and project suitability are not established by these fields. Additional data are included only when sourced and measured. Missing values remain blank; zero remains zero.

USE: Paid curation and spatial analysis of public source facts. Internal business and client work allowed; no exclusive rights to government facts claimed. Seven-day correction/refund policy if delivered files fail stated scope; dakota@landsightsolutions.com.