The core of Lehigh Valley is formed by the counties of Lehigh and Northampton, with the cities of Allentown, Bethlehem, and Easton as its main axis. The greater Lehigh Valley includes parts of adjacent counties: Berks, Carbon, Montgomery, and Bucks. Sites listed in the Lehigh Valley category and its subcategories are those having significance to more than one county within the region. For example, this is where sites for companies having locations in various locations throughout the Valley reside.