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County · code 48085

Collin CountyTexas

Collin County, Texas was created on April 3, 1846, from Grayson County and named after Collin McKinney. The county seat is McKinney.

  • Founded1846
  • County seatMcKinney
  • Named forCollin McKinney
  • Land area841 sq mi + 45 sq mi water
  • Population1,064,465 2020 Census
  • Parcels mapped399,917 checked 16 October 2026
Open the free map Click any parcel in Collin County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

GraysonHuntDentonFannin McKinney Census outline · seat marked

Where it is

Collin on the map of Texas

Texas has 254 counties and county equivalents, each with its own records office. Shapes with a page are links.

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Counties of Texas · Collin highlighted

History

Formed in 1846 from Grayson County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Collin County was created from non-county area of Fannin Land District on April 3, 1846, which created an overlap with Grayson County. Part of the Fannin Land District attached to Collin was lost to the creation of Denton County in 1846 and Cooke County in 1848. The overlap with Grayson County was resolved in 1848, with Collin retaining control of the disputed area.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

  1. 1846
    Collin County created Collin created from non-county area of Fannin Land District; resulted in an overlap with Grayson (see Overlap Area 1). Southern part Fannin Land District attached to Collin for administrative and judicial purposes. Collin not fully organized.
    from Grayson
    · Texas Laws 1846, 1st leg./p. 44
  2. 1846
    Lost territory Part of Fannin Land District attached to Collin lost to creation of Denton.
    to Denton
    · Texas Laws 1846, 1st leg./p. 57
  3. 1846
    Changed Collin fully organized. · Stambaugh and Stambaugh, 41-42
  4. 1848
    Changed Overlap Area 1 between Collin and Grayson ended; Collin retained control of disputed area.
    Grayson
    · Texas Laws 1847, 2d leg., ch. 11/p. 9
  5. 1848
    Boundary clarified Boundary between Collin and Grayson clarified (no change).
    with Graysonno change
    · Texas Laws 1847, 2d leg., ch. 18/p. 13
  6. 1848
    Lost territory Part of Fannin Land District attached to Collin lost to creation of Cooke.
    to Cooke
    · Texas Laws 1847, 2d leg., ch. 130/p. 183
  7. 1854
    Changed Cooke and Denton Land Districts re-organized; implicitly ended the attachment of non-county areas in Fannin Land District to Collin and Grayson.
    Grayson
    · Texas Laws 1853, 5th leg., ch. 72/p. 100

Land and parcels

What the maps cover in Collin

Who publishes each layer, how good it is, and when we last checked.

Official
from the office that keeps the record
Good enough
a reliable statewide or national copy
Fallback
a guide only; check the official record
Missing
nothing public found yet

People and land

Collin by the Census

Population
1,064,465 2020 Census count
Housing units
403,481 2020 Census count
Land area
841 square miles
Water area
45 square miles
People per sq mi
1,265 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

Rules and offices

Who to ask before you build, dig or sell

Official county pages only. We link to them; we do not copy them, because they change.

Inside a city or town, permits usually come from that city rather than the county.

Records

Zoning and code

  • Planning and zoning

    Russell A. Steindam Courts Building

    from collincountytx.gov · checked 13 October 2026

County government

See your own lot on these maps

Open Collin County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.

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Questions

Common questions about Collin County

When was Collin County founded?
Collin County was founded in 1846, formed from Grayson County, and named after Collin McKinney.
What is the county seat of Collin County?
The county seat of Collin County is McKinney.
Is there an online parcel map for Collin County?
Yes. A public source publishes a parcel map of 399,917 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Collin County's boundary or name changed?
Collin County was created in 1846 from Grayson County. Since then the Atlas of Historical County Boundaries records 5 later changes, chiefly involving Grayson County, Cooke County and Denton County.
Is my lot in a flood zone?
We do not have flood maps for Collin County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door