Cecilia is a census-designated place (CDP) in St. Martin Parish, Louisiana, United States. The population was 1,505 at the 2000 census. It is part of the Lafayette Metropolitan Statistical Area.
Cecilia is located at 30°20′11″N 91°50′52″W / 30.33639°N 91.84778°W / 30.33639; -91.84778 (30.336379, -91.847867).
According to the United States Census Bureau, the CDP has a total area of 1.7 square miles (4.4 km), all land.
As of the census of 2000, there were 1,505 people, 531 households, and 396 families residing in the CDP. The population density was 863.3 people per square mile (334.0/km²). There were 578 housing units at an average density of 331.6 per square mile (128.3/km²). The racial makeup of the CDP was 57.34% White, 41.53% African American, 0.53% Native American, 0.33% Asian, and 0.27% from two or more races. Hispanic or Latino of any race were 1.66% of the population.
There were 531 households out of which 38.8% had children under the age of 18 living with them, 52.7% were married couples living together, 17.9% had a female householder with no husband present, and 25.4% were non-families. 21.5% of all households were made up of individuals and 8.1% had someone living alone who was 65 years of age or older. The average household size was 2.83 and the average family size was 3.33.
In the CDP, the population was spread out with 30.6% under the age of 18, 10.4% from 18 to 24, 29.1% from 25 to 44, 19.3% from 45 to 64, and 10.5% who were 65 years of age or older. The median age was 32 years. For every 100 females, there were 93.4 males. For every 100 females age 18 and over, there were 88.4 males.
The median income for a household in the CDP was $25,976, and the median income for a family was $29,653. Males had a median income of $36,250 versus $16,959 for females. The per capita income for the CDP was $10,931. About 27.5% of families and 31.4% of the population were below the poverty line, including 35.6% of those under age 18 and 25.5% of those age 65 or over.
Cecilia is one of the last remaining strongholds of Cajun Language in Louisiana and 42.60% of the total population uses the language for daily communication, including 20.25% of the children.