Where to Download Data

GIS data for Connecticut is available from several Connecticut websites. These websites offer a variety of options for obtaining spatial data you can use with your geographic information system (GIS) software, including file downloads and map services. Additionally, many of these websites also include interactive map viewers, scanned maps, digital maps in PDF format, and aerial photos you can view online.


Data Download on CT ECO

2019 Ortho Imagery 2016 Ortho Imagery 2016 Elevation (DEM & LAS) 2016 Contours 2012 Ortho Imagery 2012 Impervious Surface

Geospatial Data Download around Connecticut

CT Dept. of Energy and Environmental Protection (DEEP) GIS Open Data - Download in shapefile, geodatabase, GeoJSON, KML or CSV format. Data categories include bioscience, elevation & bathymetry, environmental, geoscience, hydrography, land conservation and outdoor recreation, political boundaries and more. Downloads include the natural resource and environmental data used in CT ECO such as Aquifer Protection Areas, DEEP Property, Drainage Basins, Contours, Federal Open Space, 1997 Municipal and Private Open Space, Lake Bathymetry, Natural Diversity Data Base Areas, Protected Open Space Mapping, Parcels for Protected Open Space Mapping, and Water Quality Classifications.

DEEP Store - Purchase topographic maps, geologic quadrangle maps, nautical charts, and statewide maps and reports of natural resource information. Contact the DEP Store to purchase printed copies of maps viewable from the CT ECO Map Catalog.

Department of Energy and Environmental Protection

CT Office of Policy and Management (OPM) Open Data, Maps and Geospatial download in kml, kmz, shapefile or GeoJSON formats. Non-geospatial formats also available including csv, json, and xml. Data categories include business, education, environment and natural resources, government, and health and human services.

State Plan of Conservation and Development can be downloaded as a pdf or in shapefile format.

Office of Policy and Management

Connecticut Department of Transport (DOT) GIS Open Data - Download in shapefile, geodatabase, GeoJSON, KML or CSV format. Data categories include highway assets, boundaries, crash, roadways, transit and roadway projects.

DOT Crash Data Dashboards from the CT Transportation Safety Research Center at UConn.

Download and view other Transportation Related Mapping at CT DOT.

Department of Transportation

The Connecticut State Data Center at the Connecticut Data Collaborative is the State’s lead organization in the U.S. Census Bureau’s State Data Center Program for Connecticut and is the state’s official source for census data.


Connecticut State Data Center
The UConn Center for Land Use Education and Research (CLEAR) creates and provides Connecticut land cover for 1985, 1990, 1995, 2002, 2006, 2010 and 2015. CLEAR also provides statewide lidar-based digital elevation data, map services, story maps and map viewers. Visit the CLEAR website for more information.

University of Connecticut

Center for Land Use Education & Research

The Connecticut State Library maintains 1934, 1951-2, 1965, 1970, 1977, 1980, 1985-6, 1990, and 1995 statewide aerial photograph collections and additional smaller collections. All are “secured collections” that are retrieved by library staff and which must be used in the Library. The 1934, 1938, 1965, 1991, and 2004 aerial photos are also available online. Connecticut State Library
The UConn Map and Geographic Information Center (UConn MAGIC) is part of the UConn library and contains a collection of historic maps, photography and digital spatial data. MAGIC makes much of this information and more available as GIS data downloads and services. Interactive map viewers also provide online access.

University of Connecticut Map and Geographic Information Center

The Long Island Resource Center (LISRC) is jointly supported by CT DEEP and UConn and serves as a central clearinghouse for information and data related to Long Island Sound. It includes GIS data downloads and interactive mapping applications of bathymetry, sidescan sonar mosaics, geologic interpretations, surficial sediments, and more.

University of Connecticut

Department of Energy and Environmental Protection

Know of another good place to get CT GIS data? Send us an email.