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Collin County, Texas facts for kids

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Collin County
Collin County
The Collin County Courthouse in McKinney
The Collin County Courthouse in McKinney
Flag of Collin County
Official seal of Collin County
Map of Texas highlighting Collin County
Location within the U.S. state of Texas
Map of the United States highlighting Texas
Texas's location within the U.S.
Country  United States
State  Texas
Founded 1846
Named for Collin McKinney
Seat McKinney
Largest city Plano
 • Total 886 sq mi (2,290 km2)
 • Land 841 sq mi (2,180 km2)
 • Water 45 sq mi (120 km2)  5.1%%
 • Estimate 
 • Density 1,053/sq mi (407/km2)
Time zone UTC−6 (Central)
 • Summer (DST) UTC−5 (CDT)
Congressional districts 3rd, 4th, 32nd

Collin County is a county in the U.S. state of Texas. As of the 2010 United States Census, the county's population was 782,341, making it the seventh-most populous county in Texas and the 63rd-largest county by population in the United States. Its county seat is McKinney.

Collin County is part of the Dallas-Fort Worth-Arlington, Texas Metropolitan Statistical Area. A small portion of the city of Dallas is in the county.


Both the county and the county seat were named after Collin McKinney (1766-1861), one of the five men who drafted the Texas Declaration of Independence and the oldest of the 59 men who signed it.


According to the U.S. Census Bureau, the county has an area of 886 square miles (2,290 km2), of which 841 square miles (2,180 km2) is land and 45 square miles (120 km2) (5.1%) is covered by water.


Major highways

  • Texas 5.svg State Highway 5
  • Texas 78.svg State Highway 78
  • Texas 289.svg State Highway 289
  • Texas 121.svg Toll Texas SRT new.svg State Highway 121 / Sam Rayburn Tollway

Adjacent counties


Historical population
Census Pop.
1850 1,950
1860 9,264 375.1%
1870 14,013 51.3%
1880 25,983 85.4%
1890 36,736 41.4%
1900 50,087 36.3%
1910 49,021 −2.1%
1920 49,609 1.2%
1930 46,180 −6.9%
1940 47,190 2.2%
1950 41,692 −11.7%
1960 41,247 −1.1%
1970 66,920 62.2%
1980 144,576 116.0%
1990 264,036 82.6%
2000 491,675 86.2%
2010 782,341 59.1%
Est. 2015 914,127 16.8%
U.S. Decennial Census
1850–2010 2010–2014

As of the census of 2000, there were 491,675 people, 181,970 households, and 132,292 families residing in the county. The population density was 580 people per square mile (224/km²). There were 194,892 housing units at an average density of 230 per square mile (89/km²). The racial makeup of the county was 81.39% White, 4.79% Black or African American, 0.47% Native American, 6.92% Asian, 0.05% Pacific Islander, 4.26% from other races, and 2.11% from two or more races. 10.27% of the population were Hispanic or Latino of any race.

According to U.S. Census figures released in 2006, the racial makeup of the county was as follows: 77.21% White, 7.26% African American, 10.02% Asian, 0.45% Native American, 5.06% of other or mixed race. 12.8% Hispanic of any race.

There were 181,970 households out of which 40.60% had children under the age of 18 living with them, 62.10% were married couples living together, 7.50% had a female householder with no husband present, and 27.30% were non-families. 22.10% of all households were made up of individuals and 3.10% had someone living alone who was 65 years of age or older. The average household size was 2.68 and the average family size was 3.18. As of the 2010 census, there were about 4.4 same-sex couples per 1,000 households in the county.

In the county, the population was spread out with 28.70% under the age of 18, 7.40% from 18 to 24, 37.90% from 25 to 44, 20.70% from 45 to 64, and 5.30% who were 65 years of age or older. The median age was 33 years. For every 100 females there were 99.80 males. For every 100 females age 18 and over, there were 97.80 males.

The median income for a household in the county was $70,835, and the median income for a family was $81,856 (these figures had risen to $77,671 and $91,881 respectively as of a 2007 estimate). Males had a median income of $57,392 versus $36,604 for females. The per capita income for the county was $33,345. About 3.30% of families and 4.90% of the population were below the poverty line, including 5.10% of those under age 18 and 7.10% of those age 65 or over. Based on median household income, as of 2006, Collin County is the second richest county in Texas after Fort Bend, and is considered one of the wealthiest counties in the United States.

However, Collin - like other Texas counties - has one of the nation's highest property tax rates. In 2007, it was #21 for property taxes as percentage of the homes value on owner occupied housing. It also ranked in the Top 100 for amount of property taxes paid and for percentage of taxes of income. Part of this is due to the Robin Hood plan school financing system in Texas.


Collin County Parks and Open Spaces


Cities (multiple counties)



Census-designated place

Other unincorporated communities

Historical communities

Ghost towns

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