Data sources & credits
Everything comes from public services, queried live for each site. Each output's provenance log records exactly which services answered, when, and with what resolution and date.
National layers
| Layer | Source | Terms / credit |
|---|---|---|
| Topography | USGS 3D Elevation Program (3DEP) | Public domain (USGS) |
| Soils | USDA NRCS SSURGO via Soil Data Access | Public domain (USDA) |
| Flood zones | FEMA National Flood Hazard Layer | Public domain (FEMA) |
| Wetlands | U.S. Fish & Wildlife Service National Wetlands Inventory | Public domain (USFWS) |
| Road centerlines and names | U.S. Census Bureau TIGER/Line via TIGERweb | Public domain (U.S. Census Bureau) |
| Aerial imagery | Esri World Imagery (Vantor/Maxar, Earthstar Geographics, local contributors); USDA NAIP fallback | Source: Esri, Vantor, Earthstar Geographics, and the GIS User Community. NAIP: public domain (USDA) |
| Geocoding | Esri World Geocoder, U.S. Census Geocoder, OpenStreetMap Nominatim | Esri terms; Census public domain; © OpenStreetMap contributors (ODbL) |
| State Plane zones | NOAA NGS State Plane Coordinate System of 1983 (zone boundaries via Esri) | Public domain (NOAA) |
Statewide parcel layers
| State | Publisher | Coverage | Terms | Last verified |
|---|---|---|---|---|
| Alaska | Alaska Division of Forestry & Fire Protection, Alaska Department of Natural Resources | 20 local sources only: Anchorage Municipality, Bristol Bay Borough, City of Dillingham, City of Nome, City of Unalaska, City of Valdez, Coastal Villages Region Fund (CVRF), Denali Borough, Fairbanks North Star Borough, Haines Borough, Juneau City & Borough, Kenai Peninsula Borough, Ketchikan Borough, Kodiak Island Borough, Matanuska-Susitna Borough, North Slope Borough, Petersburg Borough, Sitka City & Borough, Wrangell City & Borough, Yakutat City & Borough. Unorganized Borough and other areas largely missing. | Public; explicitly NOT authoritative - a DFFP compilation of local government data; attribution/licensing per originating source (listed in the item description) | 2026-10-19 |
| Arkansas | Arkansas GIS Office (AGISO) | All 75 counties | Public; approximate parcel locations, not a legal boundary. Source: Arkansas county assessors via AGISO. | 2026-10-19 |
| Colorado | Colorado Governor's Office of Information Technology (OIT) GIS | 44 of 64 counties. Missing: Alamosa, Baca, Bent, Chaffee, Cheyenne, Conejos, Costilla, Crowley, Delta, Fremont, Jackson, Kiowa, Kit Carson, Las Animas, Lincoln, Mineral, Montrose, Otero, Phillips, Prowers | Public; attribution: Colorado OIT GIS Team and contributing county/local governments | 2026-10-19 |
| Connecticut | Connecticut Office of Policy and Management, CT GIS Office | All 169 towns | Public; attribution: CT GIS Office / OPM and contributing municipalities | 2026-10-19 |
| Delaware | Delaware FirstMap (Delaware Department of Technology and Information) | All 3 counties (New Castle, Kent, Sussex) | Public; attribution: Delaware FirstMap and county governments | 2026-10-19 |
| District of Columbia | DC Office of the Chief Technology Officer (DC GIS) | Entire District (all land outside right-of-way) | Public; attribution: District of Columbia (DC GIS / OCTO) | 2026-10-19 |
| Florida | Florida Geographic Information Office (data: Florida Department of Revenue, Property Tax Oversight) | All 67 counties | Public; attribution: Florida county property appraisers / Florida Department of Revenue PTO / FGIO. DOR does not guarantee accuracy. | 2026-10-19 |
| Hawaii | Hawaii Statewide GIS Program (Office of Planning and Sustainable Development) | All 4 counties (Hawaii, Honolulu, Kauai, Maui) | Public; attribution: Counties of Hawaii, Honolulu, Kauai and Maui; Hawaii Statewide GIS Program | 2026-10-19 |
| Idaho | State of Idaho (Idaho Geospatial Office statewide parcel framework), data from participating county assessors | 13 of 44 counties only: Ada, Bear Lake, Boise, Camas, Gooding, Jerome, Lincoln, Minidoka, Nez Perce, Oneida, Teton, Valley, Washington. All other counties missing. | Public; follow the terms of use in the Idaho Parcel Data Exchange Standard; attribution: participating Idaho counties / State of Idaho | 2026-10-19 |
| Indiana | Indiana Geographic Information Office (IndianaMap / GIS Data Harvest Program) | All 92 counties (3,682,675 parcels) | Public; citation requested (not required): Indiana GIS Data Harvest Program, parcels maintained by Indiana counties | 2026-10-19 |
| Maine | Maine GeoLibrary / Maine Office of GIS (MaineIT) | 325 organized towns that voluntarily submitted data; excludes the Unorganized Territory (separate Maine Revenue Services layer) and non-participating towns | Public; attribution: Maine GeoLibrary and contributing municipalities | 2026-10-19 |
| Maryland | MD iMAP / Maryland Department of Planning, with SDAT assessments | All 23 counties + Baltimore City (24 JURSCODE values) | Public; attribution: MD iMAP, Maryland Department of Planning, SDAT | 2026-10-19 |
| Massachusetts | MassGIS (Commonwealth of Massachusetts Bureau of Geographic Information) | All 351 cities and towns (351 distinct TOWN_ID values) | Public; attribution: MassGIS (Bureau of Geographic Information) | 2026-10-19 |
| Minnesota | Minnesota IT Services / MnGeo (Minnesota Geospatial Commons) | 59 of 87 counties (opt-in only, 2,710,201 parcels). Missing: Beltrami, Blue Earth, Brown, Cottonwood, Dodge, Faribault, Freeborn, Goodhue, Hubbard, Kanabec, Kandiyohi, Kittson, Le Sueur, Lincoln, Mahnomen, Martin, Meeker, Nicollet, Nobles, Pine, Redwood, Rock, Roseau, Sibley, Swift, Todd, Wadena, Watonwan | Free open data from counties that opted in to open distribution; attribution: MnGeo and the contributing counties | 2026-10-19 |
| Montana | Montana State Library (MSDI Cadastral), data from Montana Department of Revenue ORION | All 56 counties (Revenue-maintained; Ravalli, Silver Bow, Missoula, Flathead, Yellowstone county-maintained, integrated by MSL) | Public; attribution: Montana State Library, Department of Revenue | 2026-10-19 |
| Nebraska | Nebraska Office of the Chief Information Officer (OCIO), compiled from county assessors | All 93 counties (1,154,898 parcels) | Public; general use and analysis, authority lies with the county assessors | 2026-10-19 |
| New Hampshire | NH GRANIT (UNH Earth Systems Research Center, state GIS clearinghouse) | 236 town values incl. UNINCORPORATED (statewide mosaic); per-town completeness not independently checked | Public; attribution: NH GRANIT and contributing municipalities | 2026-10-19 |
| New Jersey | NJ Office of Information Technology, Office of GIS (NJOGIS) | All 21 counties | Public; attribution: NJOGIS and contributing counties | 2026-10-19 |
| New York | NYS Office of Information Technology Services, Geospatial Services (NYS GIS Program Office) | 38 of 62 counties. Missing: Allegany, Cattaraugus, Chemung, Chenango, Clinton, Columbia, Delaware, Dutchess, Essex, Franklin, Fulton, Herkimer, Jefferson, Madison, Monroe, Nassau, Niagara, Orleans, Saratoga, Schenectady, Schoharie, Seneca, Washington, Yates | Public; attribution: contributing counties, NYS ITS Geospatial Services, NYS DTF ORPTS | 2026-10-19 |
| North Carolina | NC OneMap / NC Center for Geographic Information and Analysis | All 100 counties plus Eastern Band of Cherokee Indians lands | Public; NC OneMap terms https://www.nconemap.gov/pages/terms; source data from NC counties | 2026-10-19 |
| North Dakota | North Dakota GIS Hub (NDIT) | All 53 counties (741,989 parcels); program focus is rural parcels, so some city parcels may be missing | Public; State of North Dakota disclaimer (not for navigation, not a survey); authority rests with counties | 2026-10-19 |
| Ohio | Ohio Geographically Referenced Information Program (OGRIP), Ohio Department of Administrative Services | All 88 counties (6,313,610 parcels) | Public, as-is; State of Ohio geospatial data disclaimer | 2026-10-19 |
| Tennessee | TN Comptroller of the Treasury, Division of Property Assessments (published on TNMap by STS/OIR) | 86 of 95 counties. Missing: Chester, Davidson, Hamilton, Hickman, Knox, Montgomery, Rutherford, Shelby, Williamson (Nashville, Memphis, Knoxville, Chattanooga, Clarksville, Murfreesboro, Franklin not covered) | Public; not intended for commercial use (Comptroller recommends the bulk download for commercial purposes). Graphical reference only, not legal boundaries. | 2026-10-19 |
| Utah | Utah Geospatial Resource Center (UGRC, formerly AGRC) | All 29 counties | Public, provided as-is; attribution: Utah Geospatial Resource Center and county recorders/assessors | 2026-10-19 |
| Vermont | Vermont Center for Geographic Information (VCGI) | Statewide parcel program; 256 distinct TOWN values | Public; attribution: VCGI and Vermont municipalities | 2026-10-19 |
| Virginia | Virginia Geographic Information Network (VGIN), Virginia Department of Emergency Management | 132 of 133 counties/independent cities (plus 4 towns that submit separately). Missing: Rappahannock County | Public; attribution: VGIN and contributing localities | 2026-10-19 |
| Washington | WaTech Geospatial Program Office (WA Geospatial Portal) | All 39 counties | Public; WaTech and contributing counties | 2026-10-16 |
| West Virginia | WV GIS Technical Center (WVU), with WV Property Tax Division and county assessors | All 55 counties | Public, as-is; attribution: WV County Assessors, WV Property Tax Division, WVDHSEM, WVGISTC | 2026-10-19 |
| Wisconsin | Wisconsin State Cartographer's Office / Wisconsin Land Information Program, Dept. of Administration | All 72 counties (3,574,646 parcels) | Public; attribution: Wisconsin Statewide Parcel Map Database Project (V12), State Cartographer's Office / WLIP at DOA | 2026-10-19 |
| Wyoming | Wyoming Department of Revenue, Property Tax Division | All 23 counties | Public; no license text on the item; attribution: Wyoming Department of Revenue / county assessors | 2026-10-19 |
Parcel layers are assessor tax-parcel compilations, not legal boundaries. Where a publisher limits commercial use, the outputs say so.