County Maps US

Collin County, Texas

A county in Texas, ranked 6 of 254 by population.

CountyFIPS 48085

Within Texas
Collin County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks McKinney, the county seat, located via the 2025 Census Gazetteer.

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Population
1,297,179
+221,667 (+20.6%) since 2020
Land area
841.5
square miles. A further 5.0% of the total area is water
Population density
1,541
people per square mile, computed rather than published
County seat
McKinney
Seat of county government.
Established
1846
179 years ago
Largest city
Plano city
Population 287,323 for the whole place, which extends beyond this county.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Collin County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Collin County, Texas from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 800 by 745 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Collin County ranks

Position among the 254 counties of Texas, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn TexasNationally
Population1,297,1796th of 25433rd of 3,144
Land area841.5 sq mi186th of 254990th of 3,144
Population density1,541 per sq mi5th of 254103rd of 3,144
Median household income$121,6002nd of 25451st of 3,143

Full data for Collin County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population1,297,179Vintage 2025 Population Estimates
Population in 20201,075,512Vintage 2025 Population Estimates
2020 estimates base?1,066,201Vintage 2025 Population Estimates
Land area841.5 sq mi2025 Gazetteer Files
Water area44.4 sq mi2025 Gazetteer Files
Total area885.9 sq mi2025 Gazetteer Files
Population density?1,541 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$121,600American Community Survey 2020-2024 5-Year Estimates
Median home value$475,600American Community Survey 2020-2024 5-Year Estimates
Median age37.3American Community Survey 2020-2024 5-Year Estimates
Households416,646American Community Survey 2020-2024 5-Year Estimates
Housing units437,396American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
+7,355
13,302 births, 5,947 deaths
Net migration
+35,851
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 6 areas bordering Collin County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Denton CountyTexas29 mi1,069,346
Grayson CountyTexas26 mi153,613
Hunt CountyTexas26 mi123,336
Dallas CountyTexas19 mi2,661,397
Rockwall CountyTexas13 mi140,738
Fannin CountyTexas9.1 mi39,265

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

Side by side

All 254 counties of Texas

Open the interactive Texas county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.