Papillion is a city in Sarpy County in the state of Nebraska. It is an 1870s railroad town that is part of the larger five-county metro area of neighboring Omaha, and is the county seat of Sarpy County. The population of Papillion was 18,894 at the 2010 census. Papillion has been nationally recognized by a number of publications: 2013 by Bloomberg Business Week as the Best Place to Raise Kids in Nebraska; 2012 by Livability.com as #1 in their Top Small Towns in America; 2011 by CNN/Money Magazine as the 5th Best Place to Live (small community) in the United States; 2010 by BusinessWeek as the 2nd Most Affordable Place to Live in America; 2009 by CNN/Money Magazine as the 3rd Best Place to Live (small community) in the United States and also the #14 Most Affordable Place to Live in the United States; and 2007 CNN/Money Magazine as the 6th Best Place to Live (small community). The median listing price for single family homes is $254,780, slightly higher than the national median home price of $221,800. The city was named after the creek of the same name which flows through its center. The name Papillion (papillon) is derived from the French term for butterfly. According to local tradition the early French explorers named the creek Papillion because many butterflies were found along its grassy banks. The city's seal indicates it was founded in 1870. Papillion (sometimes referred to as "Papio" by its residents) is one of the last of the late-18th-Century Paris-inspired frontier cities left in the Midwest. Halleck Park, a recreation area in the heart of the city, includes many trails, open spaces, trees and a number of areas of interest, including Papio Fun Park, Papio Bay Aquatic Park, Papio Pool, and Papio Bowl. In addition to trails, trees and much green space, inside the park there are tennis courts, volleyball courts, playgrounds, "The Duck Pond", Monarch Field ("The Pit"), and E.A. Fricke Field.