WebLogis, Loudoun County's Online Mapping System. Provides access to the County’s Enterprise Geographic Information System data layers.

Loudoun County, Virginia Boundary

More Metadata

Data updated daily.

Address points mark the location of each addressable structure and its access point. The access point is the place where a driveway intersects the road. The building point is where the structure is located. An addressable structure is one where people live, work, or gather. A 1 to 5-digit number designates an address. Purpose: The access point is used to assign an address to the structure. Addresses are also assigned to assist in the provision of emergency services; they can be queried at all Fire and Rescue stations and by E-911 dispatchers. Supplemental Information: Data are stored in the corporate ArcSDE Geodatabase as a feature class. The coordinate system is Virginia State Plane (North), Zone 4501, datum NAD83 HARN. Maintenance and Update Frequency: Daily Completeness Report: Features may have been eliminated or generalized due to scale and intended use. To assist Loudoun County, Virginia in the maintenance of the data, please provide any information concerning discovered errors, omissions, or other discrepancies found in the data.

Data Owner: Office of Mapping and Geographic Information

Geospatial data about Loudoun County, Virginia Topography (4ft). Export to CAD, GIS, PDF, CSV and access via API.

Loudoun County annually obtains leaf-off, aerial imagery in the spring. Since 2004, the County has utilized this imagery to support the development of an annual digital orthophoto base. In 2022, the imagery was captured with a Vexcel Ultracam Eagle digital camera, in 4-band (R,G,B, and NIR) format. These files contain 1-foot ground-resolution, 8-bit, 4-band orthorectified aerial image map products in GeoTIFF version 6.0 file format. GeoTIFF files are uncompressed raster images complete with TFW coordinate information. The aerial imagery project encompasses the entire land area of the County of Loudoun, VA. Images were flown during leaf-off conditions and cover 5000' by 5000' and are tiled according to the VBMP 200-scale gridding schema (Virginia Geographic Information Network)."February 2022 Photography flown by the Sanborn Map Company, Colorado Springs, CO." "Digital Orthophotography compiled by Sanborn Map Company, Colorado Springs, CO"

Geospatial data about Loudoun County, Virginia Parcels. Export to CAD, GIS, PDF, CSV and access via API.

More MetadataThis feature class contains all the county owned and leased property data of Loudoun County, VA as of April 2024. It is comprised from internal data and information sources combined with parcel data.

More MetadataThis Water Well layer was created in March 2010 to provide an easily accessiable spatial database of water wells only. It also provides additional attribute information on Status, Depth, etc.The original water well & pollution source layer was developed in 1988 by the County’s Environmental Health Department. Records were entered into a database from 40 years of historical paper files, which exhibited a wide range of completeness and accuracy. This was an on-going process until early 1996 at which time the layer was no longer maintained. In late 2000, the Department of Building and Development began a process of updating the layer by entering data from the permit files, which had accumulated since 1996.

This application uses surface type data to illustrate the extensive network of unpaved roads in Loudoun County, Virginia.

In September 2020, the Loudoun County Board of Supervisors directed staff to document telecommunication projects completed, in-progress, and future projects, using the 2014 Wireless GAP Analysis and the Segra Dark Fiber Area Network. Staff mapped the data identified by the Board, as well as other information related to telecommunication projects. This information was then used to identify select unserved or underserved geographic areas of the county.The companion interactive map allows the user to turn on or off all layers used in the project.

Geospatial data about Loudoun County, Virginia Steep Slope. Export to CAD, GIS, PDF, CSV and access via API.

Geospatial data about Loudoun County, Virginia Floodplain. Export to CAD, GIS, PDF, CSV and access via API.

This application includes the geographic location, name, type, address and hours for all the publicly accessible libraries in Loudoun County, Virginia.Loudoun County Public LibraryThomas Balch LibraryNational Sporting Library & Museum

Geospatial data about Loudoun County, Virginia Hydrography. Export to CAD, GIS, PDF, CSV and access via API.

The abundance of natural, environmental and heritage resources define Loudoun County’s unique sense of place. These natural, environmental and heritage resources include: The Potomac River, other major rivers and smaller stream corridors Floodplains Wetlands Steep slopes Ridges and mountainsides Forested and vegetative landscapes Limestone geology areas Farmlands Soil resources Important plant and wildlife habitats Historic and archaeological sites Scenic areas and corridors Designated heritage areas Battlefields Historic cemeteries Cultural landscapes The Loudoun County 2019 Comprehensive Plan contains policies that provide guidance for the preservation, protection and incorporation of natural, environmental and heritage resources as part of the site design and development process. The Loudoun County Zoning Ordinance contains regulations and development standards that implement the county’s policies. The preservation, protection and enhancement of the county’s natural, environmental and heritage resources contribute directly and indirectly to Loudoun’s economy and the quality of life of its residents and visitors.

This point feature class contains all the identified Loudoun County Park and Ride vehicle lots according to the Loudoun County Office of Transportation and Capital Infrastructure. Update Frequency: As needed

Geospatial data about Loudoun County, Virginia Intersections. Export to CAD, GIS, PDF, CSV and access via API.