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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 45th-largest county by population in the United States. Per the American Community Survey's estimates, its population reached 1,034,730 in 2019. Its county seat is McKinney. Collin County is part of the Dallas-Fort Worth-Arlington 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.

Lavon Lake
Major highways
US 75.svg U.S. Highway 75
US 380.svg U.S. Highway 380
Toll Texas DNT new.svg Dallas North Tollway
Texas 190.svg Toll Texas PGBT new.svg State Highway 190 / President George Bush Turnpike
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
Texas 66.svg State Highway 66
Texas 205.svg State Highway 205
Neighboring counties
Grayson County (north)
Fannin County (northeast)
Hunt County (east)
Rockwall County (southeast)
Dallas County (south)
Denton County (west)
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. 2019 1,034,730 32.3%
U.S. Decennial Census
1850–2010 2010–2019
2018 Texas Population Estimate Program
As of the 2018 Texas Population Estimate Program, the population of the county was 1,018,952. The racial makeup of the county was as follows: non-Hispanic whites 575,374 (56.47%), African Americans 97,396 (9.56%), Other non-Hispanic 176,377 (17.31%), & Hispanics and Latinos (of any race) 154,772 (15.19%).

2010 Census
As of the census of 2010, there were 782,341 people.

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.

2000 Census
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.

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, like other Texas counties, Collin County 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.

Government, courts, and politics
Collin County, like all counties in Texas, is governed by a Commissioners Court. The court consists of the county judge (the chairperson of the Court), who is elected county-wide, and four commissioners who are elected by the voters in each of four precincts.

County Commissioners
Office Name Party
County Judge Chris Hill Republican
Commissioner, Precinct 1 Susan Fletcher Republican
Commissioner, Precinct 2 Cheryl Williams Republican
Commissioner, Precinct 3 Darrell Hale Republican
Commissioner, Precinct 4 Duncan Webb Republican
County Officials
Office Name Party
County Clerk Stacey Kemp Republican
Criminal District Attorney Greg Willis Republican
District Clerk Lynne Finley Republican
Sheriff Jim Skinner Republican
Tax Assessor-Collector Kenneth Maun Republican
Collin County is a Republican stronghold in presidential and congressional elections. The last Democrat to win the county was Lyndon Johnson in 1964. The factors caused Collin to swing hard to the Republican Party in the 1960s and 1970s: and the expansion of the Dallas suburbs into Collin County. However, since the mid-2010s, Collin County has been slowly moving towards the Democratic Party, particularly in Plano and Frisco. Factors causing this shift include an influx of younger professionals and families, a more diverse population (with increasing numbers of African-Americans along with recent immigrants and their children), and an aversion to Republican Party politics following the 2016 presidential election.

In spite of this shift, Republicans still control every countywide office and all of the overlapping seats in the State Legislature. Congressman Colin Allred, who represents its southern edge as part of the 32nd congressional district, is the only Democrat elected above the municipal level in any part of the county.

Presidential elections results
State Board of Education member
District Name Party
District 12 Pam Little Republican
Texas State Representatives
District Name Party Residence
District 33 Justin Holland Republican Heath
District 66 Matt Shaheen Republican Plano
District 67 Jeff Leach Republican Plano
District 70 Scott Sanford Republican McKinney
District 89 Candy Noble Republican Lucas
Texas State Senators
District Name Party Residence
District 8 Angela Paxton Republican N/A
District 30 Pat Fallon Republican N/A
United States Representatives
District Name Party Residence
Texas's 3rd congressional district Van Taylor Republican Plano
Texas's 4th congressional district John Ratcliffe Republican Heath
Texas's 32nd congressional district Colin Allred Democrat Dallas
K-12 education
The following school districts lie entirely within Collin County:

Allen Independent School District
Anna Independent School District
Farmersville Independent School District
Lovejoy Independent School District
McKinney Independent School District
Melissa Independent School District
Plano Independent School District
Princeton Independent School District
Wylie Independent School District
The following districts lie partly within the county:

Bland Independent School District (very small part only)
Blue Ridge Independent School District
Celina Independent School District
Community Independent School District
Frisco Independent School District
Leonard Independent School District (very small part only)
Prosper Independent School District
Royse City Independent School District
Trenton Independent School District (very small part only)
Van Alstyne Independent School District (very small part only)
Whitewright Independent School District (very small part only)
In the 1990s Plano ISD received many non-Hispanic white families leaving urban areas. From circa 1997 and 2015 the number of non-Hispanic white children in K-12 schools in the county increased by 40,000 as part of a trend of white flight and suburbanization by non-Hispanic white families; however the same number of Plano ISD in particular decreased by 10,000 in that period.

Colleges and universities
Collin College opened its first campus on Highway 380 in McKinney in 1985. The college has grown to seven campuses/locations—two in McKinney and two in Plano and as well as Frisco, Allen and Rockwall. Dallas Baptist University also has an extension site in Frisco, DBU Frisco. The majority of the University of Texas at Dallas campus in Richardson, Texas lies within Collin County.

Collin County Parks and Open Spaces

Bratonia Park
Myers Park
Parkhill Prairie
Sister Grove Park
Trinity Trail
Heard Natural Science Museum and Wildlife Sanctuary
Collin County is part of the Dallas/Fort Worth DMA. Local media outlets are: KDFW-TV, KXAS-TV, WFAA-TV, KTVT-TV, KERA-TV, KTXA-TV, KDFI-TV, KDAF-TV, and KFWD-TV. Other nearby stations that provide coverage for Collin County come from the Sherman/Denison market and they include: KTEN-TV and KXII-TV.

Newspapers in the Collin County area include the Allen American, Celina Record, Frisco Enterprise, McKinney Courier-Gazette, and the Plano Star-Courier. Nearby publications The Dallas Morning News and the Fort Worth Star-Telegram also provide news coverage of cities in the county.

Cities (multiple counties)
Carrollton (mostly in Dallas and Denton counties)
Celina (small part in Denton County)
Dallas (mostly in Dallas County with small parts in Denton, Kaufman, Rockwall and Collin counties)
Frisco (partly in Denton County)
Garland (mostly in Dallas County and a small part in Rockwall County)
Josephine (small part in Hunt County)
Plano (small part in Denton County)
Prosper (partly in Denton County)
Richardson (mostly in Dallas County)
Royse City (mostly in Rockwall County and partly Hunt County)
Sachse (mostly in Dallas County)
Van Alstyne (mostly in Grayson County)
Wylie (small parts in Rockwall and Dallas counties)
Blue Ridge
Lowry Crossing
McKinney (County Seat)
Hebron (mostly in Denton County)
New Hope
St. Paul
Census-designated place
Other unincorporated communities
Beverly Hill
Clear Lake
Deep Water Point Estates
Forest Grove
Lavon Beach Estates
Lavon Shores Estates
Little Ridge
New Mesquite
Pebble Beach Sunset Acres
Pecan Grove
Rhea Mills
Snow Hill
Trinity Park
Walnut Grove
Yucote Acres
Historical communities
Ghost towns
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Plant Fertilizers
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Plant Nutrient Kits
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