St. Mary Parish, LA

What LandBenchmark can tell you about a parcel in St. Mary Parish — and, just as importantly, what it can't.

Land area
558.5
sq mi
Water area
561.2
sq mi
County FIPS
22101
Center
29.629, -91.464

Area and center from the US Census Bureau 2023 Gazetteer.

Measured terrain around the St. Mary Parish centroid

Centroid elevation
3
m (10 ft)
Terrain relief
10
m spread (p95−p5, ~20–40 km window)

The county center sits at about 3 m above sea level. Elevation across the sampled window spreads 10 m — flat terrain by our banding (flat <30 m · gently rolling 30–100 m · hilly 100–300 m · mountainous >300 m). Water covers about 50% of the county's area (Census Gazetteer). These are county-scale context, not parcel measurements — a specific parcel gets its own slope, flood and usable-acreage readings when analyzed.

Elevation measured 2026-07-21 from the AWS Terrain Tiles (terrarium encoding, z10).

Data available for St. Mary Parish

  • No free owner records. Louisiana does not publish a free statewide parcel-and-owner dataset, so LandBenchmark cannot show who owns a parcel in St. Mary Parish. The county assessor's office is the authoritative source. Every measured signal below is unaffected.
  • Legal description — township, range and section from the BLM Public Land Survey System.
  • FEMA flood zones, wetlands, soil survey and NCCPI soil productivity — the federal layers, all free and all available here.
  • 56 measured signals from satellite imagery and public records — slope and usable acreage, observed surface water, vegetation trend, wildfire and seismic hazard, access and neighboring land use. Each one cites its method, its source, and the date it was observed.

LandBenchmark has no listings and does not know what is for sale in St. Mary Parish. It analyses a parcel you point it at. It is an automated Phase-1 desk screen, not a survey, a flood determination, or a substitute for on-site inspection.

Common questions about land in St. Mary Parish

Can I see who owns a parcel in St. Mary Parish?

Not from free data — Louisiana does not publish a free statewide parcel-ownership dataset, and LandBenchmark does not buy broker data. The St. Mary Parish assessor's office is the authoritative source; every measured signal is unaffected.

How hilly is St. Mary Parish?

Around the county center, measured elevation spreads 10 m across a ~20–40 km window — flat terrain by our banding. Individual parcels vary: a report measures the actual slope and usable acreage of the parcel you point it at.

What can LandBenchmark measure for a parcel in St. Mary Parish?

56 measured signals, each cited with source and observation date: FEMA flood zone plus surface water observed in multi-year imagery, USFWS wetlands, USDA soil survey and productivity, slope and usable acreage, wildfire and seismic hazard, access and surroundings. What a satellite cannot verify — title, zoning, perc results, water rights — goes on a human-verify checklist naming the St. Mary Parish offices that can.

Nearest neighboring counties