Lost Springs is a city in Marion County, Kansas, United States. It was named for the old lost spring near the city. As of the 2010 census, the city population was 70.
Lost Springs is located at 38°33′59″N 96°57′55″W / 38.56639°N 96.96528°W / 38.56639; -96.96528 (38.566495, -96.965225). According to the United States Census Bureau, the city has a total area of 0.23 square miles (0.60 km), all of it land. The county line is 1.7 miles east of Lost Springs.
As of the census of 2010, there were 70 people, 26 households, and 23 families residing in the city. The population density was 304.3 inhabitants per square mile (117.5/km). There were 30 housing units at an average density of 130.4 per square mile (50.3/km). The racial makeup of the city was 82.9% White, 1.4% Native American, 7.1% from other races, and 8.6% from two or more races. Hispanic or Latino of any race were 14.3% of the population.
There were 26 households of which 26.9% had children under the age of 18 living with them, 61.5% were married couples living together, 11.5% had a female householder with no husband present, 15.4% had a male householder with no wife present, and 11.5% were non-families. 11.5% of all households were made up of individuals. The average household size was 2.69 and the average family size was 2.70.
The median age in the city was 45.5 years. 18.6% of residents were under the age of 18; 11.4% were between the ages of 18 and 24; 20% were from 25 to 44; 27.2% were from 45 to 64; and 22.9% were 65 years of age or older. The gender makeup of the city was 55.7% male and 44.3% female.
As of the census of 2000, there were 71 people, 30 households, and 23 families residing in the city. The population density was 308.3 people per square mile (119.2/km²). There were 34 housing units at an average density of 147.6 per square mile (57.1/km²). The racial makeup of the city was 92.96% White, 1.41% Native American, 2.82% from other races, and 2.82% from two or more races. Hispanic or Latino of any race were 7.04% of the population.
There were 30 households out of which 36.7% had children under the age of 18 living with them, 56.7% were married couples living together, 16.7% had a female householder with no husband present, and 23.3% were non-families. 23.3% of all households were made up of individuals and 13.3% had someone living alone who was 65 years of age or older. The average household size was 2.37 and the average family size was 2.70.
In the city, the population was spread out with 28.2% under the age of 18, 5.6% from 18 to 24, 25.4% from 25 to 44, 28.2% from 45 to 64, and 12.7% who were 65 years of age or older. The median age was 39 years. For every 100 females, there were 91.9 males. For every 100 females age 18 and over, there were 82.1 males.
As of 2000 the median income for a household in the city was $15,455, and the median income for a family was $16,250. Males had a median income of $15,625 versus $11,250 for females. The per capita income for the city was $7,227. There were 15.8% of families and 21.7% of the population living below the poverty line, including 29.4% of under eighteens and none of those over 64.