High Quality Content by WIKIPEDIA articles! Papillion is a city in Sarpy County in the U.S. state of Nebraska. It is a suburb to the southwest of neighboring Omaha, and is the county seat of Sarpy County. The population of Papillion was 18,894 at the 2010 census. In 2009, Papillion was named the #3 best place to live in the United States by Money Magazine. surpassing its 2007 ranking of #6.