31 years. For every 100 females, there were 92.4 males. For every 100 females age 18 and over, there were 102.7 males. The median income for a household in the city was $30,625, and the median income for a family was $34,167. Males had a median income of $26,500 versus $18,750 for females. The per capita income for the city was $11,305. About 15.0% of families and 17.7% of the population were below the poverty line, including 21.8% of those under the age of eighteen and 8.0% of those 65 or over. Education It is a part of the North Butler Community School District, which was established on July 1, 2011, as a merger of the Greene Community School District and Allison–Bristow Community School District, The local high school is North Butler High School. Notable person Bristow is the hometown of Ed Yost, inventor of the modern hot air balloon. References External links Cities in Butler County, Iowa Cities in Iowa