Olpe is a city in Lyon County, Kansas, United States. As of the 2010 census, the city population was 548.
Olpe is located at 38°15′43″N 96°10′10″W / 38.26194°N 96.16944°W / 38.26194; -96.16944 (38.262070, -96.169322). According to the United States Census Bureau, the city has a total area of 0.80 square miles (2.07 km), of which 0.67 square miles (1.74 km) is land and 0.13 square miles (0.34 km) is water.
Olpe is part of the Emporia Micropolitan Statistical Area.
As of the census of 2010, there were 546 people, 220 households, and 151 families residing in the city. The population density was 814.9 inhabitants per square mile (314.6/km). There were 239 housing units at an average density of 356.7 per square mile (137.7/km). The racial makeup of the city was 98.7% White, 0.2% African American, 0.2% from other races, and 0.9% from two or more races. Hispanic or Latino of any race were 0.5% of the population.
There were 220 households of which 34.5% had children under the age of 18 living with them, 58.6% were married couples living together, 5.0% had a female householder with no husband present, 5.0% had a male householder with no wife present, and 31.4% were non-families. 25.9% of all households were made up of individuals and 13.6% had someone living alone who was 65 years of age or older. The average household size was 2.48 and the average family size was 3.00.
The median age in the city was 39 years. 27.3% of residents were under the age of 18; 4.8% were between the ages of 18 and 24; 26.2% were from 25 to 44; 24% were from 45 to 64; and 17.8% were 65 years of age or older. The gender makeup of the city was 49.8% male and 50.2% female.
As of the census of 2000, there were 504 people, 196 households, and 137 families residing in the city. The population density was 1,604.1 people per square mile (627.7/km²). There were 215 housing units at an average density of 684.3 per square mile (267.8/km²). The racial makeup of the city was 98.81% White, 0.40% African American, 0.60% Native American, and 0.20% from two or more races. Hispanic or Latino of any race were 2.58% of the population.
There were 196 households out of which 39.3% had children under the age of 18 living with them, 56.1% were married couples living together, 10.7% had a female householder with no husband present, and 30.1% were non-families. 28.6% of all households were made up of individuals and 16.3% had someone living alone who was 65 years of age or older. The average household size was 2.57 and the average family size was 3.20.
In the city, the population was spread out with 31.7% under the age of 18, 7.9% from 18 to 24, 28.6% from 25 to 44, 17.7% from 45 to 64, and 14.1% who were 65 years of age or older. The median age was 33 years. For every 100 females, there were 96.9 males. For every 100 females age 18 and over, there were 90.1 males.
The median income for a household in the city was $34,643, and the median income for a family was $37,813. Males had a median income of $30,625 versus $18,542 for females. The per capita income for the city was $13,623. About 5.8% of families and 7.3% of the population were below the poverty line, including 10.8% of those under age 18 and 8.3% of those age 65 or over.