Silex is a 4th Class City in Lincoln County, Missouri, United States. The population was 280 at the 2010 census.
Silex is located at 39°7′23″N 91°3′27″W / 39.12306°N 91.05750°W / 39.12306; -91.05750 (39.122968, -91.057371).
According to the United States Census Bureau, the city has a total area of 0.19 square miles (0.49 km), all land.
Duncan Mansion is located in Silex.
As of the census of 2010, there were 187 people, 57 households, and 37 families residing in the village. The population density was 984.2 inhabitants per square mile (380.0/km). There were 84 housing units at an average density of 442.1 per square mile (170.7/km). The racial makeup of the village was 97.9% White and 2.1% African American.
There were 57 households of which 29.8% had children under the age of 18 living with them, 36.8% were married couples living together, 21.1% had a female householder with no husband present, 7.0% had a male householder with no wife present, and 35.1% were non-families. 29.8% of all households were made up of individuals and 8.8% had someone living alone who was 65 years of age or older. The average household size was 2.53 and the average family size was 3.16.
The median age in the city was 38.8 years. 22.5% of residents were under the age of 18; 10.1% were between the ages of 18 and 24; 21.4% were from 25 to 44; 33.7% were from 45 to 64; and 12.3% were 65 years of age or older. The gender makeup of the village was 51.9% male and 48.1% female.
As of the census of 2000, there were 206 people, 80 households, and 59 families residing in the village. The population density was 1,074.5 people per square mile (418.6/km²). There were 91 housing units at an average density of 474.6 per square mile (184.9/km²). The racial makeup of the village was 99.03% White, and 0.97% from two or more races.
There were 80 households out of which 33.8% had children under the age of 18 living with them, 53.8% were married couples living together, 16.3% had a female householder with no husband present, and 26.3% were non-families. 21.3% of all households were made up of individuals and 6.3% had someone living alone who was 65 years of age or older. The average household size was 2.58 and the average family size was 2.97.
In the city the population was spread out with 26.2% under the age of 18, 8.7% from 18 to 24, 33.0% from 25 to 44, 18.4% from 45 to 64, and 13.6% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 106.0 males. For every 100 females age 18 and over, there were 97.4 males.
The median income for a household in the city was $24,531, and the median income for a family was $33,125. Males had a median income of $30,313 versus $19,167 for females. The per capita income for the city was $12,529. About 11.3% of families and 12.5% of the population were below the poverty line, including 10.4% of those under the age of eighteen and none of those sixty-five or over.