Thematic Map

http://www.elderweb.com/node/2867

Thematic maps purposefully relate a particular concept or idea (hence, theme) to a specific geographical location. According to the Map Collection & Cartographic Information Services Unit at the University of Washington, thematic maps "can portray physical, social, political, cultural, economic, sociological, agricultural, or any other aspects of a city, state, region, nation, or continent". While a normal map can tie in several concepts at once - i.e, maps that show gerrymandering tie in geographical, locational, and political concepts - thematic maps tend to focus on just one idea or theme. Thematic maps have a variety of uses. For example, they can provide specific information about a particular location, or they can show spatial trends over time regarding certain themes (weather, politics, census, etc.)
The thematic map above shows the Percentage of Households with Individuals 65 and Over for the State of Florida. This information was retrieved from the 2000 census, and is sorted by county.