www.arcgis.com - With a free public account you can create, store, and manage maps, apps, and files, and share them with others. You also get access to content shared by Esri and GIS users around the world. Public accounts are for noncommercial use only.
FACTS & DATA
www.factfinder2.census.gov - Your source for population, housing, economic and geographic data.
www.datagateway.nrcs.usda.gov - The Geospatial Data Gateway (GDG) is the One Stop Source for environmental and natural resources data, at anytime, from anywhere, to anyone. The Gateway allows you to choose your area of interest, browse and select data from our catalog, customize the format, and have it downloaded or shipped on CD or DVD.
www.msc.fema.gov - View National Flood Hazard Layer (NFHL) maps used for Flood Insurance Rate Maps (FIRM)
www.illinoisfloodnullmaps.org - view Flood Insurance Rate Maps for Illinois Counties
www.historicmapworks.com - (new item) Great place to view old plat maps in high resolution. Click this link to search Henry County, Illinois
NationalMap.gov - (new item) The National map, by U.S. Geological Survey (USGS), is a collaborative effort among the USGS and other Federal, State, and local partners to improve and deliver topographic information for the Nation.