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County · code 48409

San Patricio CountyTexas

San Patricio County is a county in Texas established as a municipality by Mexico in 1834 and reorganized as a Texas county in 1845. The county seat is Sinton.

  • Founded1834
  • County seatSinton
  • Named forSan Patricio, Texas
  • Land area693 sq mi + 15 sq mi water
  • Population68,755 2020 Census
  • Parcels mapped49,214 checked 14 October 2026
Open the free map Click any parcel in San Patricio County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

NuecesBeeRefugioAransasJim WellsLive Oak Sinton Census outline · seat marked

Where it is

San Patricio 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 · San Patricio highlighted

History

Founded in 1834

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

San Patricio was established as a municipality by Mexico in April 1834, then became a county in the Republic of Texas in 1836. After Texas statehood in 1845, San Patricio was reorganized and officially became a state county in December 1845. Over the following decades, San Patricio exchanged territory with neighboring counties including Bexar, Goliad, Nueces, and Refugio, and lost land to the creation of Karnes, Live Oak, and Bee counties.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries; the 5 that matter most are shown first.

  1. c. 1834
    San Patricio County created San Patricio (original county) established as a municipality by Mexico. · Gammel, 1:Laws and Decrees of Coahuila and Texas, decree no. 283/p. 384
  2. 1836
    Became part of Texas San Patricio became a county in the Republic of Texas. · Connor, 170-171; Swindler, 9:254-255
  3. 1838
    Exchanged territory San Patricio exchanged with Bexar.
    with Bexar
    · Texas Repub. Laws 1838, 2d cong., 2d sess./p. 33
  4. 1841
    Exchanged territory San Patricio exchanged with Goliad.
    with Goliad
    · Texas Repub. Laws 1841, 6th cong., 1st sess./p. 6
  5. 1845
    Became part of Texas San Patricio became a county in the newly-established state of Texas. · Texas Repub. Laws 1845, 9th cong., spec. sess./pp. 4-6; U.S. Stat., vol. 9, res. 1 [1845]/p. 108; Van Zandt, 122
Show all 15 changes (10 more)
  1. c. 1834
    San Patricio County created San Patricio (original county) established as a municipality by Mexico. · Gammel, 1:Laws and Decrees of Coahuila and Texas, decree no. 283/p. 384
  2. 1836
    Became part of Texas San Patricio became a county in the Republic of Texas. · Connor, 170-171; Swindler, 9:254-255
  3. 1838
    Exchanged territory San Patricio exchanged with Bexar.
    with Bexar
    · Texas Repub. Laws 1838, 2d cong., 2d sess./p. 33
  4. 1841
    Exchanged territory San Patricio exchanged with Goliad.
    with Goliad
    · Texas Repub. Laws 1841, 6th cong., 1st sess./p. 6
  5. 1845
    Changed San Patricio re-organized. · Texas Repub. Laws 1844, 9th cong., 1st sess./p. 21
  6. 1845
    Became part of Texas San Patricio became a county in the newly-established state of Texas. · Texas Repub. Laws 1845, 9th cong., spec. sess./pp. 4-6; U.S. Stat., vol. 9, res. 1 [1845]/p. 108; Van Zandt, 122
  7. 1846
    Gained territory San Patricio gained from Refugio, lost to creation of Nueces.
    from Refugiofrom Nueces
    · Texas Laws 1846, 1st leg./pp. 86, 90
  8. 1852
    Boundary clarified San Patricio boundaries clarified (no change).
    no change
    · Texas Laws 1851, 4th leg., reg. sess., ch. 84/p. 90
  9. 1854
    Lost territory San Patricio lost to creation of Karnes.
    to Karnes
    · Texas Laws 1853, 5th leg., ch. 35/p. 44
  10. 1856
    Lost territory San Patricio lost to creation of Live Oak; part of San Patricio reverted to Non-County Area 23.
    to Live Oak
    · Texas Laws 1855, 6th leg., reg. sess., ch. 59/pp. 54-56
  11. 1857
    Gained territory San Patricio gained from Refugio, exchanged with Nueces, and lost to creation of Bee (Nueces exchange repealed 23 January 1858).
    from Refugiofrom Nuecesfrom Bee
    · Texas Laws 1857, 7th leg., chs. 13-14/pp. 10-11
  12. 1858
    Exchanged territory San Patricio exchanged with Nueces (repealed act of 8 December 1857); lost to Refugio.
    with Nueceswith Refugio
    · Texas Laws 1857, 7th leg., ch. 59/p. 65
  13. 1858
    Lost territory San Patricio lost to Nueces in Corpus Christi and Aransas Bays, including Mustang Island and "various small Islands."
    to Nueces
    · Texas Laws 1857, 7th leg., ch. 89/p. 105
  14. 1887
    Exchanged territory San Patricio exchanged with Aransas (later repealed).
    with Aransas
    · Texas Laws 1887, 20th leg., reg. sess., ch. 40/p. 28
  15. 1891
    Exchanged territory San Patricio exchanged with Aransas (later repealed).
    with Aransas
    · Texas Laws 1891, 22d leg., reg. sess., ch. 109/p. 172

Land and parcels

What the maps cover in San Patricio

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

San Patricio by the Census

Population
68,755 2020 Census count
Housing units
29,424 2020 Census count
Land area
693 square miles
Water area
15 square miles
People per sq mi
99 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

Permits

County government

See your own lot on these maps

Open San Patricio 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 San Patricio County

When was San Patricio County founded?
San Patricio County was founded in 1834, and named after San Patricio, Texas.
What is the county seat of San Patricio County?
The county seat of San Patricio County is Sinton.
Is there an online parcel map for San Patricio County?
Yes. San Patricio County publishes a parcel map of 49,214 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has San Patricio County's boundary or name changed?
San Patricio County was created in 1834. Since then the Atlas of Historical County Boundaries records 13 later changes, chiefly involving Nueces County, Refugio County and Aransas County.
Who issues building permits in San Patricio County?
The county's page on building permits: Building Permit. Inside a city or town, ask that city first.
Who issues septic and well permits in San Patricio County?
The county's page on septic systems and wells: Health department: septic and well.
Is my lot in a flood zone?
We do not have flood maps for San Patricio 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