Maryland location data
Isopleth answers questions about any coordinate or street address in Maryland with 351 public-data fields from 95 sources: flood and wildfire risk, soils and slope, the power grid, water and roads, climate, and county economics. Each value carries its source, license and vintage. Use it from the REST API or through the MCP server in Claude, ChatGPT, Cursor and other assistants.
Parcel coverage in Maryland
Parcel records: 2,293,824 parcels in 24 counties. Published by Maryland Department of Planning; State Department of Assessments and Taxation (SDAT) (Public, attribution); SDAT assessments May 2026, refreshed quarterly.
Share of parcels with each column filled: site address 88%, total value 94%, land use 96%, sale date 91%, zoning 74%, year built 82%. Not published here: owner name.
Sample values in Maryland
What our API returned at the Census Bureau's interior point of Maryland's 3 largest counties by land area, computed 2026-10-29. One point is not a whole county: values can change within a few hundred meters, so look up your own site. "No data" means the dataset has nothing at that point.
| field | Frederick County | Garrett County | Baltimore County |
|---|---|---|---|
| Hazards | |||
| FEMA flood zone | AE | X | X |
| Inside a mapped floodplain | Yes | No | No |
| Wildfire, annual frequency | 0.000044 events a year | 0.00027 events a year | 0.0000083 events a year |
| Tornado, annual frequency | 0.012 events a year | 0.0074 events a year | 0.00073 events a year |
| Hail, annual frequency | 3.8 events a year | 2.0 events a year | 3.6 events a year |
| Current drought category | D1 | no data | D0 |
| On a mapped wetland | No | No | No |
| Nearest mapped wetland | 56 m | 109 m | 199 m |
| Land | |||
| Elevation | 81 m (265 ft) | 821 m (2,692 ft) | 111 m (364 ft) |
| Slope | 0.1° | 4.3° | 9.4° |
| Soil drainage | Well drained | Moderately well drained | Well drained |
| Soil hydrologic group | B | D | C |
| Farmland class | Prime | Statewide importance | Prime |
| Land use | Agriculture | Forest | Developed |
| Crop or cover (CDL) | Alfalfa | Barren | Developed/Low Intensity |
| Dominant crop, 5 years | Alfalfa | no data | no data |
| Tree canopy | 0% | 8% | 21% |
| On protected land (PAD-US) | No | No | No |
| Surface manager | Private or unknown | Private or unknown | Private or unknown |
| Climate & energy | |||
| Annual precipitation (normal) | 1,095 mm (43 in) | 1,277 mm (50 in) | 1,214 mm (48 in) |
| Days above 32 °C a year | 28 days | 0 days | 28 days |
| Solar resource (GHI) | 4.20 kWh/m²/day | 4.06 kWh/m²/day | 4.23 kWh/m²/day |
| Mean wind speed at 100 m | 5.3 m/s | 8.6 m/s | 6.3 m/s |
| Wind capacity factor | 32% | 41% | 33% |
| Infrastructure | |||
| Nearest transmission line | 1.0 km (0.6 mi) | no data | no data |
| Nearest substation (69 kV+) | 694 m | 6.3 km (3.9 mi) | 1.7 km (1.1 mi) |
| Nearest gas pipeline | 21.8 km (13.5 mi) | 10.0 km (6.2 mi) | 7.0 km (4.4 mi) |
| Electric utility | THE POTOMAC EDISON COMPANY | THE POTOMAC EDISON COMPANY | BALTIMORE GAS & ELECTRIC CO |
| In a public water service area | No | No | Yes |
| Depth to water, nearest monitored well | 10.7 m (35 ft) | 9.1 m (30 ft) | -0.1 m (-0 ft) |
| Nearest major road | 309 m | 3.0 km (1.8 mi) | 879 m |
| Community | |||
| Nearest fire station | 3.4 km (2.1 mi) | 6.7 km (4.2 mi) | 2.3 km (1.4 mi) |
| Nearest hospital | 3.3 km (2.1 mi) | 7.0 km (4.4 mi) | 1.3 km (0.8 mi) |
| Nearest school | 1.6 km (1.0 mi) | 4.8 km (3.0 mi) | 555 m |
| In an Opportunity Zone | No | No | No |
County pages
- Frederick County 661 sq mi of land
- Garrett County 649 sq mi of land
- Baltimore County 598 sq mi of land
Datasets that returned data at these points
| source | fields |
|---|---|
BLM_SMA Bureau of Land Management | surface_management_agency |
EIA_ATLAS U.S. Energy Information Administration | nearest_gas_pipeline_distance_m, nearest_transmission_line_distance_m |
EIA_POWER U.S. Energy Information Administration | electric_utility_service_territory, nearest_substation_distance_m |
EPA_CWS_SERVICE_AREAS U.S. Environmental Protection Agency | within_water_service_area |
FEMA_NFHL Federal Emergency Management Agency | nfhl_flood_zone, within_floodplain_polygon |
FEMA_NRI Federal Emergency Management Agency | hail_annual_frequency, tornado_annual_frequency, wildfire_annual_frequency |
HUD_OPPORTUNITY_ZONES U.S. Department of Housing and Urban Development | in_opportunity_zone |
NOAA_NCEI_NCLIMGRID_DAILY National Oceanic and Atmospheric Administration | days_above_32c_annual_count |
NOAA_NCEI_NORMALS_GRIDDED National Oceanic and Atmospheric Administration | annual_precipitation_normal_mm |
NREL_REV_LANDBASED_WIND_SC_2024 NREL reV supply curves, Open Energy Data Initiative (OEDI) | wind_capacity_factor_pct |
NREL_SOLAR_RESOURCE_V1 NREL Solar Resource Data (NSRDB) | ghi_annual_kwh_m2_day |
NREL_WIND_TOOLKIT NREL WIND Toolkit (Draxl et al., 2015) | mean_wind_speed_100m_ms |
OVERTURE_PLACES © Overture Maps Foundation | nearest_fire_station_distance_m, nearest_hospital_distance_m, nearest_school_distance_m |
OVERTURE_TRANSPORTATION © Overture Maps Foundation, © OpenStreetMap contributors | nearest_major_road_distance_m |
PAD_US USGS Protected Areas Database of the United States (PAD-US) | intersects_protected_area |
USDA_CDL U.S. Department of Agriculture | cdl_class, dominant_crop_5y |
USDA_SSURGO U.S. Department of Agriculture | prime_farmland_classification, soil_drainage_class, soil_hydrologic_group |
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. | drought_category |
USFS_LCMS USDA Forest Service | land_use_class |
USFS_NLCD_TCC USDA Forest Service | tree_canopy_pct |
USFWS_NWI U.S. Fish and Wildlife Service | intersects_wetland, nearest_wetland_distance_m |
USGS_3DEP_COG U.S. Geological Survey | elevation, slope_degrees |
USGS_NWIS_OGC U.S. Geological Survey | nearest_groundwater_well_depth_to_water_m |
These are only the sources behind the fields sampled here. The full list is on Sources & licenses and every field is in the field catalog.
What people use it for in Maryland
- Land buyers: screen a lot for flood zone, wetlands, slope, soils, road and water access before a site visit; search Maryland parcels by county, acreage or land use. Buyers who want it written up can order a $29 report on Check the Land, which is built on Isopleth.
- Solar, wind and data-center siting: distance to transmission and substations, solar and wind resource, protected land.
- Insurance and lending: hazard frequencies and floodplain status for every address in a book.
- Real estate and research: county income, growth and house-price trends next to on-the-ground facts.
See use cases for prompts and the exact fields.
Try it
curl https://api.isopleth.dev/v1/fetch -H "Authorization: Bearer $ISOPLETH_KEY" \
-H "Content-Type: application/json" \
-d '{"lat": 39.470177, "lng": -77.397636, "preset": "site_selection"}'
Or ask your assistant: “Using Isopleth, what are the flood zone, slope and soil drainage at 39.4702, -77.3976?”
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