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Aerial maps (2)
Aerial photographs (695)
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North Central, PA Regional Planning and Development Commission (1)
Allegan County GIS Data Library (11)
Allegheny County GIS Open Data (42)
Allen County GIS Data Download Page (11)
American Panorama (538)
Ann Arbor Data Catalog (35)
Anne Arundel County GIS Data (70)
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Ashland County, WI GIS Open Data Portal (9)
Athens Conservancy GIS Center (53)
Athens County GIS Data (11)
Baltimore County Open Data Portal (207)
Becker County GIS Data Downloads (23)
Benton County GIS Data Downloads (5)
Big Stone County Open Data (12)
Big Ten Academic Alliance Geospatial Information Network (9)
Brandeis University (1)
Brown County, Ohio (1)
CMAP (Chicago Metropolitan Agency for Planning) Data Hub (51)
Calvert County Open GIS Data Portal (16)
Capital Area Open Data Portal (5)
Carroll County GIS Open Data (27)
Carver County GIS Data (42)
Cass County GIS Downloadable Files (10)
Center for Ancient Middle Eastern Landscapes, Institute for the Study of Ancient Cultures, University of Chicago (8,792)
Center for Rural Pennsylvania (1)
Central Ohio Covid-19 Resource Hub (1)
Centre County Open Data (82)
Chester County GIS Data (52)
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Chisago County GIS Data Downloads (14)
City of Bloomington, Indiana Open Data Portal (25)
City of Chicago Data Portal (244)
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City of Grand Island Public GIS Data Portal (31)
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Clay County Open Data (3)
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Cook Central (236)
Cook County Open Data (157)
Cornell (473)
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Delaware County GIS (25)
Delaware Valley Regional Planning Commission (DVRPC) (148)
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DuPage County GIS (51)
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Eidgenössische Technische Hochschule Zürich (2)
Evansville, Vanderburgh County, Indiana Open Data Collection (50)
Fire Insurance Maps Online (52)
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Frederick County Open Data (115)
GEOhio Spatial Data Discovery Portal (314)
GIS Data Downloads for Champaign County, Ohio (16)
GIS Data Downloads for Erie County, Ohio (56)
GIS Data Downloads for Fairfield County Auditor's Office, Ohio (35)
GIS Data Downloads for Geauga County Auditor, Ohio (50)
GIS Data Downloads for Queen Anne's County, Maryland (57)
GIS Downloads for Licking County, Ohio (5)
GeoDa Data and Lab (73)
Geodata Hub of Vilas County, WI (29)
Grant County Open Data Hub (28)
Hamilton County, Indiana Open Data Collection (42)
Harford County Planning and Zoning Open GIS (74)
Harvard (183)
Hennepin County GIS Data (25)
High Country News (1)
Hoosier Resilience Index: Indiana (17)
Howard County Open Data (5)
Humanitarian Data Exchange (6,701)
ICPSR (Inter-university Consortium for Political and Social Research) (1)
Illinois DOT Open Data Portal (99)
Illinois Geospatial Data Clearinghouse (192)
Indiana Covid-19 Cases Tracker (1)
Indiana University (14,884)
IndianaMap (374)
Iowa Emergency Operations Center (1)
Iowa Geodata (235)
IowaDOT Open Data (546)
Kenosha County, WI GIS Open Data Portal (31)
Lake County Illinois Open Data Portal (53)
Land Records Data Portal of Columbia County, WI (85)
LandScan Global Population Database (23)
Library of Congress Geography and Map Division (1)
Lincoln Open Data and Performance Management (90)
Linn County, Iowa Open Data Portal (53)
Lorain County GIS Data (85)
Macoupin Data (2)
MapHub (1)
Maryland National Capital Parks and Planning Commission (1)
Maryland iMap (1,249)
McLean County GIS Consortium Open Data (21)
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McLeod County, Minnesota (1)
Michigan Covid-19 Summary (Michigan State Police) (1)
Michigan State University (1,226)
Michiganology (2,466)
Milwaukee County GIS Download (99)
Minnesota Geospatial Commons (996)
Minnesota Geospatial Information Office (MnGeo) (3,406)
Minnesota Legislative Coordinating Commission - Geospatial Information (LCC-GIS) (27)
Montgomery County Open Data (1,554)
National Renewable Energy Laboratory (1)
Native Land Digital (4)
Natural Resources Research Institute (106)
Nebraska Game & Parks Map and Data Portal (1)
NebraskaMap (152)
New Jersey Department of Environmental Protection's (NJDEP) Bureau of GIS (300)
New Jersey Farmland Preservation Program (22)
New Jersey Geographic Information Network (NJGIN) Open Data Portal (310)
North Central PA Hub (6)
Northwestern University (251)
Oakland County, MI Open data (107)
Omaha/Douglas County GIS Open Data Portal (69)
Open Data DC (907)
Open Data Minneapolis (193)
OpenDataPhilly (192)
OpenIndy Data Portal (82)
OpenTopography (1)
Otter Tail County GIS Data Downloads (10)
Outagamie County GIS Download (21)
PHLmaps (322)
Pennsylvania Department of Conservation and Natural Resources Open Data Portal (57)
Pennsylvania Department of Environmental Protection (156)
Pennsylvania Spatial Data Access (PASDA) (2,037)
Pennsylvania State University (3,888)
Peoria County GIS Open Data Portal (70)
Pierce County GIS Open Data Portal (4)
PolicyMap (387)
Polk County GIS Open Data (62)
Pope County Open Data (41)
Prince George's County GIS Open Data (262)
Prince George's County Open Data Portal (13)
Princeton (1,004)
Purdue University (120)
Racine County GIS Download (41)
Ramsey County Open Data (36)
Renville County Open GIS Data (44)
Russian Military Topographic Map Collection (3)
Rutgers University-New Brunswick (4,554)
SEMCOG Open Data (36)
Saint Louis County GIS & Mapping (18)
Sarpy County GIS Portal (131)
Sauk County GIS Download (51)
SimplyAnalytics (12)
Social Explorer (448)
South Bend, IN Open Data (42)
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St Mary's County GIS Downloadable Layers (25)
St. Croix County GIS Download (1)
Stanford (1,109)
Stark County GIS Data (110)
State of Michigan Open Data Portal (367)
State of Pennsylvania (1)
Summit County GIS Data (31)
The Newberry Library (2)
The Newberry Library (53)
The Ohio State University (255)
Three Rivers Park District Open Data (5)
U.S. Department of Agriculture (1)
U.S. Fish and Wildlife Service Open Data (1,972)
UM Matthaei Botanical Gardens and Nichols Arboretum (62)
UW Digital Collections Center (2,596)
UW-Madison Robinson Map Library (6,077)
University of Chicago (71)
University of Chicago Library GIS Data Hub (34)
University of Illinois Urbana-Champaign (2,501)
University of Iowa (3,595)
University of Maryland (274)
University of Michigan (1,140)
University of Minnesota (5,990)
University of Nebraska (372)
University of Nebraska-Lincoln (60)
University of Wisconsin-Madison (1)
Waukesha County GIS Download (37)
Waupaca County GIS Download (29)
Waushara County GIS Download (10)
Western Pennsylvania Regional Data Center Open Data (52)
Wilkin County, Minnesota Open Data (17)
Wisconsin Geological and Natural History Survey (61)
Wisconsin Rapids Online Map Portal (18)
Wisconsin State Cartographer's Office (1)
WisconsinView (2,170)
Wood County Open Data Portal (13)
Yellow Medicine County Hub (5)
York County, PA GIS Open Data Portal (50)
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