Cinco Ranch is a census-designated place and master-planned community located in the extraterritorial jurisdiction of the city of Houston within Fort Bend and Harris counties in the U.S. state of Texas. The population was 18,274 at the 2010 census. It lies about 25 miles (40 km) west of the Harris County seat of Houston and 10 miles (16 km) north of the Fort Bend County seat of Richmond. Cinco Ranch is considered to be part of the Greater Katy area and is roughly 10 miles southeast of the city of Katy.
Cinco Ranch is located at 29°44′29″N 95°45′30″W / 29.74139°N 95.75833°W / 29.74139; -95.75833 (29.741522, -95.758343).
According to the United States Census Bureau, the CDP has a total area of 4.9 square miles (12.8 km²). None of the area is covered with water.
As of the census of 2000, there were 11,196 people, 3,375 households, and 3,064 families residing in the CDP. The population density was 2,270.0 people per square mile (876.8/km²). There were 3,594 housing units at an average density of 728.7/sq mi (281.5/km²). The racial makeup of the CDP was 87.92% White, 2.85% African American, 0.23% Native American, 6.63% Asian, 0.02% Pacific Islander, 1.06% from other races, and 1.30% from two or more races. Hispanic or Latino of any race were 5.84% of the population.
14% of Cinco Ranch residents report German ancestry, another 14% report English ancestry, and 10% report Irish. These are the three most common reported ancestries. Fourth is Asian, at 7%.
There were 3,375 households out of which 63.7% had children under the age of 18 living with them, 84.9% were married couples living together, 3.8% had a female householder with no husband present, and 9.2% were non-families. 7.5% of all households were made up of individuals and 1.2% had someone living alone who was 65 years of age or older. The average household size was 3.32 and the average family size was 3.52.
In the CDP, the population was spread out with 38.3% under the age of 18, 3.8% from 18 to 24, 32.5% from 25 to 44, 22.2% from 45 to 64, and 3.2% who were 65 years of age or older. The median age was 35 years. For every 100 females, there were 99.9 males. For every 100 females age 18 and over, there were 98.9 males.
The median income for a household in the CDP was $111,517, and the median income for a family was $114,550. Males had a median income of $90,117 versus $42,304 for females. The per capita income for the CDP was $37,747. About 1.5% of families and 1.3% of the population were below the poverty line, including 1.1% of those under age 18 and 2.6% of those age 65 or over.