Population from U.S. Census ACS 5-year tract estimates aggregated to county · flood from FEMA NFHL · contamination from EPA Superfund and state brownfields · generated 2026-10-07.
What the numbers mean for a buyer
Population has fallen 10.2% since 2010. Thin comparable-sales data is the practical problem: fewer transactions means wider valuation uncertainty, and services like public water or broadband may be contracting rather than expanding. Verify that any utility a listing promises is actually still being extended.
TerraIQs carries 19,789 scored parcels across Marion County's 381 square miles — about 52 per square mile. That profile is a mix of subdivided tracts and working acreage — the county where both urban and rural constraints show up in the same search.
Flood risk in Marion County
Our current FEMA extract shows no mapped Special Flood Hazard Areas in Marion County. Read that precisely: it means detailed DFIRM flood mapping has not been published for this area, which is common in sparsely populated counties — it is not a finding that the land doesn't flood. For an unmapped county a report leans on terrain and slope analysis instead, and a local floodplain administrator is worth a call.
See how to check whether a Texas parcel is in a flood zone for what each zone letter obligates you to do.
Contamination and environmental records
There are 1 recorded contamination sites in Marion County (EPA Superfund and state brownfields). A report measures your parcel's distance to each, which is what matters if you plan to put in a water well or anything involving soil disturbance.
Run a report on a Marion County parcel
Search by parcel ID, owner name or address. The report covers flood, pipelines, contamination, wells, soil, slope, zoning, infrastructure, protected areas, habitat and road access in one document. First report free.
What due diligence in Marion County involves
The county-level numbers above tell you what to expect; they don't settle any individual parcel. The checks that decide a deal — legal access, title exceptions, mineral severance, septic suitability, agricultural valuation rollback — are parcel-specific and partly document-based. Our Texas land due diligence checklist walks the full sequence in the order we'd run it, including which steps are free and which are worth paying for.
In Marion County specifically, note that pipeline crossings are common across Texas and are invisible from the road — pipeline easements restrict where you can build permanently.
Frequently asked
TerraIQs carries 19,789 scored parcels in Marion County. Statewide the dataset covers 14.3M+ parcels across all 254 counties; the scored subset is the rural-shard parcels, while urban and residential lots have full dossiers without a quality score.
Our current FEMA extract shows no mapped Special Flood Hazard Areas in Marion County, which means detailed DFIRM mapping has not been published there — not that the land doesn't flood. A parcel report falls back to terrain and slope analysis.
Flood zones, pipeline and utility proximity, contamination site distance, water well records, NRCS soil and septic suitability, slope and terrain, zoning where it exists, infrastructure, protected areas, critical habitat, road access with traffic counts, and population growth context — each with its source dataset version and retrieval date.