NPA - 531 (Nebraska)
The 531 area code is part of geographic numbering plan area that includes Nebraska.
There are a few special area codes with the last two digits 422 match, these are known as easily recognizable codes (ERCs). The 8xx set of numbers are reserved for toll-free services and communication.
Nebraska was the first state in the country to celebrate Arbor Day—in 1872, when Nebraskan politician J. Sterling Morton advocated a tree-planting day to beautify the state’s largely treeless landscape. A wide variety of prairies originally covered Nebraska; now the slopes of the river valleys are well covered with deciduous trees. Cottonwood, elm, and some oak and walnut are found along the bluffs of eastern Nebraska, while conifers grow in the Wild Cat and Pine Ridge highlands and the Niobrara valley. The Nebraska National Forest in west-central Nebraska resulted from a human effort to plant trees on the barren plains.