In Virginia, Henrico County, which surrounds the City of Richmond on three sides, petioned the US Postal Service in 2008 to allow 'HENRICO' as an acceptable label for affected ZIP codes that were used on its territory. Establishing a shared identity was a factor, but so was the fact that in some cases collected taxes were misappropriated to the wrong jurisdiction on account of a label lookup from the mailing address [2].
[1] https://en.wikipedia.org/wiki/Unincorporated_towns_in_Nevada [2] http://www.henricocitizen.com/index.php/news/article/address...