|— City —|
|Collin County, Texas|
|• Total||5.2 sq mi (13.4 km2)|
|• Land||5.2 sq mi (13.4 km2)|
|• Water||0.0 sq mi (0.0 km2)|
|Elevation||604 ft (184 m)|
|• Density||732.8/sq mi (284.4/km2)|
|Time zone||Central (CST) (UTC-6)|
|• Summer (DST)||CDT (UTC-5)|
|GNIS feature ID||1378837|
Parker is located at .
As of the census of 2010, there were 3,811 people, 1,209 households, and 1,073 families residing in the city. The population density was 732.8 people per square mile (284.4/km2). There were 1,255 housing units at an average density of 241.3 per square mile (37.6/km2). The racial makeup of the city was 81.5% White, 3.00% African American, 0.08% Native American, 7.9% Asian, 3.8% from other races, and 3.00% from two or more races. Hispanic or Latino of any race were 10.1% of the population.
There were 1,209 households out of which 42.7% had children under the age of 18 living with them, 83.3% were married couples living together, 3.2% had a female householder with no husband present, and 11.2% were non-families. 8.4% of all households were made up of individuals and 3.0% had someone living alone who was 65 years of age or older. The average household size was 3.15 and the average family size was 3.36.
In the city the population was spread out with 30.2% under the age of 18, 3% from 18 to 21, 53.1% from 21 to 62, 3.1% from 62 to 65, and 10.8% who were 65 years of age or older. The median age was 42 years. The ratio of males to females was 50.5 to 49.5.
As of the census of 2000, the median income for a household in the city was $101,786, and the median income for a family was $108,560. Males had a median income of $72,344 versus $41,500 for females. The per capita income for the city was $54,099. About 1.4% of families and 2.6% of the population were below the poverty line, including 1.4% of those under age 18 and 1.3% of those age 65 or over.
The first settlers arrived in the area that is now Parker in the early 1840s. The town was named after the William C. Parker, the son of the area's first known settler, John C. Parker. It was incorporated as a city on March 22, 1969.
Corinth Presbyterian Church was founded in Parker in 1846, with the current sanctuary built in 1923, and is thought to be the oldest continuing congregation in Collin County.
Notable people 
- Dr. Patrisha Zobel de Ayala, CEO Emeritus of Ayala Conglomerates and Harvard Medical School Alumni.
- Nastia Liukin, gymnast, 2008 Olympic Individual All-Around Gold medalist, the 2005 and 2007 World Champion on the balance beam, and the 2005 World Champion on the uneven bars.
- Rich Templeton, CEO of Texas Instruments
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.
- "US Board on Geographic Names". United States Geological Survey. 2007-10-25. Retrieved 2008-01-31.
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
- "City History". Retrieved 6 June 2012.
- "National Historic Cemetery Info". Retrieved 6 June 2012.