Winfield is a city in Lincoln County, Missouri, United States. The population was 1,404 at the 2010 census.
Winfield was laid out in 1879, and named after Winfield Scott Killam, the original owner of the town site. A post office called Winfield has been in operation since 1880.
On June 18, 2008, floodwaters opened a 150-foot breach in a primary levee along the Mississippi River in Winfield. The breach allowed floodwaters to claim dozens of homes and large tracts of farmland and put pressure on a secondary levee. The breach also prompted Lincoln County emergency officials to order the evacuation of residents east of Winfield. Press reports noted that some evacuees were being housed at the local high school.
On April 9, 2009, Winfield made news around both the US and the rest of the world after it elected their popular mayor, Harry Stonebraker, to a fourth term, several weeks after he died of a heart attack. This was because ballot papers had already been printed and absentee voting had begun. He won by a landslide, securing 90% of the vote by April 9.
Winfield appointed a temporary mayor to serve until a special election was held in April 2010.
Winfield is located at 38°59′47″N 90°44′24″W (38.996469, -90.739898).
According to the United States Census Bureau, the city has a total area of 0.64 square miles (1.66 km2), all land.
At the 2010 census there were 1,404 people, 525 households, and 360 families living in the city.