Union County, Arkansas
Union County covers 1,039 square miles of land. Below is what the Isopleth API returned at the Census Bureau's interior point for the county (33.16822, -92.59815) on 2026-10-29. The ground sits at 58 m (190 ft) on a 0.3° slope, the mapped soil is moderately well drained, it is outside a mapped FEMA floodplain, the nearest 69 kV+ substation is 3.8 km (2.4 mi) away and a major road is 1.3 km (0.8 mi) away. Values describe that one point, not the whole county; look up your own address or coordinates for your site.
Sample point values
| field | value | source |
|---|---|---|
| FEMA flood zone | X | FEMA_NFHL Federal Emergency Management Agencyvintage 05139C_STUDY1 |
| Inside a mapped floodplain | No | FEMA_NFHL Federal Emergency Management Agencyvintage 05139C_STUDY1 |
| Wildfire, annual frequency | 0.00027 events a year | FEMA_NRI Federal Emergency Management Agencyvintage December 2025 |
| Tornado, annual frequency | 0.11 events a year | FEMA_NRI Federal Emergency Management Agencyvintage December 2025 |
| Hail, annual frequency | 3.8 events a year | FEMA_NRI Federal Emergency Management Agencyvintage December 2025 |
| Current drought category | D4 | USDM_CURRENT The U.S. Drought Monitor is jointly produced by the National Drought Mitigation Center at the University of Nebraska-Lincoln, the United States Department of Agriculture, and the National Oceanic and Atmospheric Administration. Map courtesy of NDMC.vintage US Drought Monitor map valid 20261020 |
| On a mapped wetland | No | USFWS_NWI U.S. Fish and Wildlife Service |
| Nearest mapped wetland | 172 m | USFWS_NWI U.S. Fish and Wildlife Service |
| Elevation | 58 m (190 ft) | USGS_3DEP_COG U.S. Geological Surveyvintage 3DEP 1/3 arc-second seamless DEM |
| Slope | 0.3° | USGS_3DEP_COG U.S. Geological Survey |
| Soil drainage | Moderately well drained | USDA_SSURGO U.S. Department of Agriculturevintage SSURGO AR139 mukey 579185 |
| Soil hydrologic group | C | USDA_SSURGO U.S. Department of Agriculturevintage SSURGO AR139 mukey 579185 |
| Farmland class | Prime | USDA_SSURGO U.S. Department of Agriculturevintage SSURGO AR139 mukey 579185 |
| Land use | Forest | USFS_LCMS USDA Forest Servicevintage USFS LCMS CONUS 2025 annual (30 m) |
| Crop or cover (CDL) | Evergreen Forest | USDA_CDL U.S. Department of Agriculturevintage USDA CDL 2025 (30 m) |
| Tree canopy | 86% | USFS_NLCD_TCC USDA Forest Servicevintage USFS/MRLC NLCD Tree Canopy Cover (latest annual, 30 m) |
| On protected land (PAD-US) | No | PAD_US USGS Protected Areas Database of the United States (PAD-US)vintage USGS PAD-US 4.1 (Protection Mechanism Category combined layer) |
| Surface manager | Private or unknown | BLM_SMA Bureau of Land Management |
| Annual precipitation (normal) | 1,403 mm (55 in) | NOAA_NCEI_NORMALS_GRIDDED National Oceanic and Atmospheric Administrationvintage NOAA NCEI 1991-2020 gridded (nClimGrid) monthly normals v1.0, annual layers |
| Days above 32 °C a year | 78 days | NOAA_NCEI_NCLIMGRID_DAILY National Oceanic and Atmospheric Administrationvintage NOAA nClimGrid-Daily v1.0 (scaled), 1991-2020 mean annual day counts |
| Solar resource (GHI) | 4.74 kWh/m²/day | NREL_SOLAR_RESOURCE_V1 NREL Solar Resource Data (NSRDB)vintage NREL PSM v3 multiyear annual average (1998-2016, ~4 km, Americas) |
| Mean wind speed at 100 m | 6.3 m/s | NREL_WIND_TOOLKIT NREL WIND Toolkit (Draxl et al., 2015)vintage NREL WIND Toolkit CONUS v1.0.0, 2007-2013 (5-min, 2 km) |
| Wind capacity factor | 32% | NREL_REV_LANDBASED_WIND_SC_2024 NREL reV supply curves, Open Energy Data Initiative (OEDI)vintage NREL reV land-based wind SC 2024 (Open access) |
| Nearest transmission line | 87 m | EIA_ATLAS U.S. Energy Information Administration |
| Nearest substation (69 kV+) | 3.8 km (2.4 mi) | EIA_POWER U.S. Energy Information Administration |
| Nearest gas pipeline | 694 m | EIA_ATLAS U.S. Energy Information Administration |
| Electric utility | ENTERGY ARKANSAS LLC | EIA_POWER U.S. Energy Information Administrationvintage HIFLD Electric Retail Service Territories |
| In a public water service area | No | EPA_CWS_SERVICE_AREAS U.S. Environmental Protection Agencyvintage V3.0 (2026-03-17) |
| Depth to water, nearest monitored well | 82.4 m (270 ft) | USGS_NWIS_OGC U.S. Geological Surveyvintage USGS Water Data discrete groundwater-level field measurements (latest per well) |
| Nearest major road | 1.3 km (0.8 mi) | OVERTURE_TRANSPORTATION © Overture Maps Foundation, © OpenStreetMap contributorsvintage 2026-10-21.0 |
| Nearest fire station | 6.6 km (4.1 mi) | OVERTURE_PLACES © Overture Maps Foundationvintage 2026-10-21.0 |
| Nearest hospital | 8.3 km (5.1 mi) | OVERTURE_PLACES © Overture Maps Foundationvintage 2026-10-21.0 |
| Nearest school | 4.8 km (3.0 mi) | OVERTURE_PLACES © Overture Maps Foundationvintage 2026-10-21.0 |
| In an Opportunity Zone | No | HUD_OPPORTUNITY_ZONES U.S. Department of Housing and Urban Development |
Fields with no data at this point are left out. See the field catalog for all 351 fields.
Parcels
Parcel records: 2,149,448 parcels in 75 counties. Union County has 31,633 of them. Published by Arkansas GIS Office; county assessors (Public); County CAMA snapshots, semi-annual updates (pubdate 2026-10), refreshed quarterly.
Share of parcels with each column filled: owner name 100%, site address 81%, total value 95%, land use 100%. Not published here: sale date, zoning, year built.
The parcel under the sample point is 636.2 acres; its public record includes owner name, site address, total value, assessed value, land value, legal description, land-use code, PLSS section. parcel_enrich returns that record for any parcel you ask about, and parcel_search finds parcels by acreage, land use or value.
Look up your own site
curl https://api.isopleth.dev/v1/fetch -H "Authorization: Bearer $ISOPLETH_KEY" \
-H "Content-Type: application/json" \
-d '{"lat": 33.168219, "lng": -92.598145, "preset": "site_selection"}'
Or ask your assistant through the MCP server: “Using Isopleth, check flood zone, wetlands, soils and distance to power for [your address in Union County, Arkansas].”
Buying land here? Check the Land’s Union County page shows what its $29 report checks, built on these same Isopleth fields.
More in Arkansas: White County · Arkansas County · Arkansas overview · all states