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Buying land in Dallas County, Missouri: what to check

Dallas County covers 541 square miles of land and 2 of water in Missouri, with about 17,877 residents in 2024 (up 4.7% since 2020). The 2020 Census counted 100% of its land as rural and 0% of residents as living in urban areas. Farms operate 48% of the county's land. Below: how much of Dallas County floods, what its soils allow, what farmland is worth and how often it's in drought, from free public data with every source linked.

Check a location in Dallas CountySee a sample report

Dallas County at a glance

In the 100-year floodplain

5.3%

Below the state's county median (8.3%)

FEMA National Risk Index

Hydric (wetland-type) soils

5.5%

Below the state's county median (8.4%)

USDA NRCS Web Soil Survey (SSURGO)

Soils very limited for septic

92%

USDA NRCS Web Soil Survey (SSURGO)

Farm land value, 2022

$4,179/acre

Below the state's county median ($4,462)

USDA NASS, 2022 Census of Agriculture

Weeks in severe drought

13%

Share of weekly maps, 2021–2026

U.S. Drought Monitor county statistics

Land classed rural

100%

Census 2020 Census urban and rural classification

What to check before buying land in Dallas County

Ordered by what Dallas County's numbers point to. Every parcel differs, so treat this as where to look first.

  1. 1.Budget for a perc test and maybe an engineered septic

    USDA rates 92% of Dallas County's mapped soils "very limited" for conventional septic absorption fields and 0% "not limited".

    Without city sewer you need a septic permit from the county or state health department. Make the offer contingent on a passing soil or perc test; mound and aerobic systems can cost several times a conventional one.

    Guide: Perc tests and septic systems

  2. 2.Confirm legal road access and power

    The 2020 Census classified 100% of Dallas County's land area as rural.

    Rural tracts are often sold without recorded access or a power line nearby. Get the title company to confirm a recorded easement or public road frontage, and ask the electric co-op what a line extension costs.

    Guide: Road access and landlocked land

  3. 3.Check slope at the building site

    28% of Dallas County's mapped soils have an average slope over 15% (USDA SSURGO).

    Steep ground means grading, retaining walls, longer driveways and erosion control. Compare the slope at the house site and along the access route, not just the parcel average.

    Guide: Terrain and slope

  4. 4.Confirm the flood zone at your exact spot

    5.3% of the county's area is in the 1%-annual-chance (100-year) floodplain FEMA's National Risk Index uses for inland flooding; 9.7% of its mapped soils flood occasionally or frequently.

    Even where little of the county floods, creeks and low spots do. Check the FEMA zone at the building site and the driveway route.

    Guide: Flood zones before buying land

  5. 5.Check the soils if you plan to farm, graze or garden

    Farm real estate in Dallas County averaged $4,179 an acre including buildings in the 2022 Census of Agriculture, and 36% of its mapped soils are prime or of statewide importance.

    Compare the asking price with recent sales of similar tracts, not the county average, which mixes cropland, pasture, timber and homesites. If an ag tax valuation applies, ask what the rollback taxes would be if you change the use.

    Guide: Land due diligence checklist

  6. 6.Check wildfire exposure and insurance

    FEMA rates Dallas County's wildfire risk relatively low, and 22% of the county's area is in the wildfire exposure zone the National Risk Index uses.

    Ask an insurer for a quote early; some carriers won't write new policies in high-hazard areas. Check access for fire trucks, nearby fire stations and the vegetation around the building site.

    Guide: Wildfire risk for rural land

Flood zones, wetlands and water in Dallas County

Area in the 1%-annual-chance (100-year) floodplain
5.3%, 26th lowest of 115 in Missouri FEMA National Risk Index
Mapped soils that flood occasionally or frequently
9.7% USDA NRCS Web Soil Survey (SSURGO)
Hydric soils (a federal wetland indicator)
5.5% USDA NRCS Web Soil Survey (SSURGO)
Poorly or very poorly drained soils
3.2% USDA NRCS Web Soil Survey (SSURGO)
Surface water (lakes, rivers, reservoirs)
2 sq mi Census 2024 Gazetteer Files
Drought on 2026-10-27
100% moderate or worse, 100% severe or worse U.S. Drought Monitor county statistics

The floodplain share is the area FEMA's National Risk Index counts as exposed to inland flooding, mostly mapped 100-year flood zones. It says how common flood-prone land is in Dallas County, not whether a given parcel floods. For that, look up the zone at your exact point on the FEMA Flood Map Service Center or run the free check.

Soils and terrain

Prime farmland
8.7% USDA NRCS Web Soil Survey (SSURGO)
Prime only if drained, irrigated or protected
3.8% USDA NRCS Web Soil Survey (SSURGO)
Farmland of statewide importance
27% USDA NRCS Web Soil Survey (SSURGO)
Average slope over 15%
28% USDA NRCS Web Soil Survey (SSURGO)
Very limited for septic absorption fields
92% USDA NRCS Web Soil Survey (SSURGO)
Not limited for septic absorption fields
0% USDA NRCS Web Soil Survey (SSURGO)

Shares of Dallas County's soil-surveyed land (about 347,104 acres, open water excluded), using each map unit's dominant condition in USDA's SSURGO soil survey. Soils change within a few hundred feet, so the soil at your building site is what matters.

Farms and land use

Farms (2022)
1,010 USDA NASS, 2022 Census of Agriculture
Share of the county's land in farms
48% USDA NASS, 2022 Census of Agriculture
Average farm size
165 acres (median 80) USDA NASS, 2022 Census of Agriculture
Average value of land and buildings
$4,179 per acre, 49th lowest of 114 in Missouri USDA NASS, 2022 Census of Agriculture
Cropland
50,165 acres USDA NASS, 2022 Census of Agriculture
Pasture and rangeland
94,656 acres USDA NASS, 2022 Census of Agriculture
Woodland on farms
37,627 acres USDA NASS, 2022 Census of Agriculture
Irrigated land
655 acres USDA NASS, 2022 Census of Agriculture

Natural hazard ratings

FEMA's National Risk Index rates each hazard for Dallas County relative to every other U.S. county. Overall risk: Very Low.

  • LightningRelatively High
  • Strong windRelatively Moderate
  • DroughtRelatively Low
  • HailRelatively Low
  • Heat waveRelatively Low
  • River and inland floodingRelatively Low
  • TornadoRelatively Low
  • WildfireRelatively Low
  • Winter weatherRelatively Low
  • EarthquakeVery Low
  • HurricaneVery Low
  • LandslideVery Low

FEMA National Risk Index, December 2025

Questions about buying land in Dallas County

How much of Dallas County, MO is in a flood zone?

About 5.3% of Dallas County's area is in the 1%-annual-chance (100-year) floodplain used by FEMA's National Risk Index (December 2025), 26th lowest of 115 counties in Missouri. Whether a given parcel is in a flood zone depends on its exact location, so check the FEMA map at your pin.

How much does land cost per acre in Dallas County?

The 2022 Census of Agriculture put the average value of farm land and buildings in Dallas County at $4,179 an acre, 49th lowest of 114 counties in Missouri (the median Missouri county was $4,462). It's a self-reported average across farms, so small homesites and recreational tracts often sell for more per acre.

Will a septic system work on land in Dallas County?

Often, but test first. USDA soil surveys rate 92% of Dallas County's mapped soils very limited for conventional septic absorption fields, usually because of wetness, slow permeability, shallow rock or flooding. A perc or soil test on the parcel decides what system the health department will permit.

Is there good farmland in Dallas County?

8.7% of Dallas County's mapped soils are prime farmland, 3.8% are prime only if drained, irrigated or protected from flooding, and 27% are farmland of statewide importance (USDA SSURGO). The 2022 Census of Agriculture counted 1,010 farms averaging 165 acres.

How often is Dallas County in drought?

Since 2021, at least half of the county was in severe drought or worse in 13% of weekly U.S. Drought Monitor maps, and in extreme drought in 4.2%. On 2026-10-27, 100% of the county was in moderate drought or worse.

Can I check a specific property in Dallas County?

Yes. Enter the address or drop a pin anywhere in Dallas County on the free check. It shows which checks return data at that exact point, and the full report costs $29: flood zone, slope, soils, wetlands, roads, power lines, wildfire and more, each with its source. It is a screen of public maps, not a survey, title search or perc test.

Check the parcel, not just the county

County numbers tell you what to look for. The free check looks at your exact point in Dallas County: flood zone, slope, soils, wetlands, roads, power and more. The full report is $29.

Check a location in Dallas County

What these numbers can't tell you

  • County shares describe Dallas County as a whole; a parcel can be entirely in or out of a flood zone, wetland or poor soil.
  • It doesn't look at the whole parcel, its boundaries, title, easements, zoning or permits.
  • It isn't a survey, appraisal, elevation certificate, soil or perc test, or Phase I environmental site assessment.
  • It can't see local distribution power lines, driveways, legal access, wells or mineral rights.
  • Maps lag behind the ground, and distances are straight-line, not driving distance.

Sources and vintages

Summarized per county by our build script on 2026-10-31. County figures cover the whole county; checks on the report are at your point.