Data Sources

Check out these helpful resources for accessing some of Connecticut's public domain geospatial data. Some resources are data downloads and others are GIS map services.

Primary Resources


Maps & Geospatial Data for Everyone

Statewide environmental and natural resource data including high resolution aerial imagery, statewide lidar elevation and related products. CT ECO data can be viewed in a variety of formats from static PDF maps and map viewers to GIS map and image services that can be used by GIS or CAD professionals in desktop software.


Connecticut Department of Energy & Environmental Protection

Downloadable statewide GIS data from CT DEEP in shapefiles and file geodatabase formats.

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CLEAR Imagery & Data

Featuring Connecticut's Changing Landscape data, 30 years of land cover and derived products for Connecticut. Also includes links to other data-related CLEAR products and information.

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UConn Map and Geographic Information Center (MAGIC)

The University of Connecticut's Map and Geographic Information Center provides digital access to historical maps, atlases, aerial photographs and geospatial data for Connecticut and the surrounding region.

Additional Resources


CT Data Collaborative

CT Data Collaborative

A data portal containing public datasets that have been curated and processed into a machine-readable structure. Includes data exploration tools to visualize the data, download the raw data and explore it on your own.

CT Open Data Portal

Search, browse, visualize and download public data provided by Connecticut's state agencies.


DataHaven creates and shares information focused on Connecticut's town and neighborhood profiles in the form of published reports, maps, raw datasets, and external resources.

CT State Library

CT State Library

The Connecticut State Library holds a large collection of cartographic material, including maps, atlases, and gazetteers of Connecticut, its counties, regions, and local political units, New England, and other areas to and from which Connecticut people migrated.