Cumberland County Library

Atlapedia Online

http://www.atlapedia.com/
Almanac, atlas and encyclopedia on both geography and countries.

City - Data.com

http://www.city-data.com/
Detailed information on cities across the US, covering real estate prices, stats about residents, crime data, religions, unemployment data, and much, much more.

Map Machine

http://maps.nationalgeographic.com/map-machine/
From National Geographic and ESRI, a leader in GIS software, site features small but rather flexible maps not just limited to physical maps and atlases. Also contains political, census, and historical maps among others. Maps are rather small, but quick and more detailed than they first appear. Covers US and the world.

Maps.com

http://www.maps.com/
Free and fee-based maps, including topographic and aerial/satellite. Site is aimed primarily at travellers, with driving directions, etc. Colorful.

TopoZone

http://www.topozone.com/
Topographic maps by state and type of place (bridges, lakes, mountains, etc.). Checks elevation, latitude and longitude in each result.

USGS Geographic Names Information System (GNIS)

http://geonames.usgs.gov/domestic/
Contains information about almost 2 million physical and cultural geographic features in the United States. The federally recognized name of each feature described in the database is identified, and references are made to a feature's location by state, county, and geographic coordinates. The GNIS is our nation's official repository of domestic geographic names information.