The 816 area code is an integral part of the telecommunication landscape in Missouri, USA.

Historical Significance: The 816 area code has been in use since January 1, 1947. It is one of the original area codes assigned in the North American Numbering Plan and has been serving the state of Missouri for over seven decades​​.

Geographical Coverage and Population: This area code covers a significant portion of northwestern Missouri, including major cities and communities such as Kansas City, St. Joseph, Savannah, Richmond, Maysville, Odessa, Adrian, Holden, Lawson, and Drexel. In terms of population, the 816 area code, along with its overlay (975), serves approximately 1.49 million people​​​​.

Overlay Code Implementation: To address the growing demand for telephone numbers, the Missouri Public Service Commission adopted an overlay plan for the 816 area code. This resulted in the introduction of the 975 area code as an overlay, serving the same geographic area as the 816 area code. This overlay was implemented as part of an order issued on October 24, 2000​​.

In summary, the 816 area code is a longstanding and vital part of Missouri's telecommunication infrastructure, supporting a large population and encompassing key cities and communities. Its historical roots and adaptation to the evolving demands of telecommunication highlight its importance in the region.