A new report has shed light on the locations of the most polluted cities in the U.S. On Tuesday, IQAir, a Swiss tech company ...

A hardiness zone is a geographic area with a similar average minimum temperature. The map is based on the average annual ...

Measles cases are popping up across the United States, including an outbreak in Texas that has led to the death of a child.

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.

Vermont and Wyoming are tied for the lowest populations in the US at just 600,000 residents each and reflecting the number of residents makes them so tiny, they can hardly be seen in the map.

A second measles-related death was reported out of New Mexico this week. Here's where measles cases have been reported in the U.S. this year.