Extreme heat is impacting states across the country. See maps of high temperature forecasts and heat index levels.

Maps were produced by USGS at that scale as early as 1904, with revisions made until 2006. 3DHP uses updated, high-accuracy elevation data collected as part of the 3D Elevation Program (3DEP).

The population is spread out among 3.8 million square miles across 50 states, yet nearly one-third of Americans live in just three states: California, Texas and New York.

The U.S. is in peak flu season, as the Centers for Disease Control says “seasonal influenza activity remains elevated and continues to increase across the country.” ...

The U.S. is in peak flu season, as the CDC releases a map of influenza activity across the country. See which states are at the highest risk of flu activity.

Google Maps also offers elevation information based on topographical maps. The United States Geologic Survey (USGS) offers a free topoBuilder tool that displays extensive information on detailed maps.

The map of flu activity across the United States continues to darken, both figuratively and literally, as case numbers spike upward in most states, according to the Centers for Disease Control and … ...

USGS researchers have unveiled the first map of prospective locations for hydrogen gas in the contiguous United States — and there's a lot more than they previously thought.

President-elect Trump again suggested Canada should be added as the U.S.'s 51st state, sharing maps showing Canada as part of the U.S.

Using Department of Homeland Security data, Newsweek created this map to show the top 10 states where undocumented immigrants live.

Enacted on Dec. 20, new base flood elevation for Palm Beach Midtown may mean higher construction cost and flood insurance premiums for homeowners.