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Parish · code 22103

St. Tammany ParishLouisiana

St. Tammany Parish is a parish in Louisiana with its seat in Covington, formed in 1810.

  • Founded1810
  • County seatCovington
  • Land area845 sq mi + 250 sq mi water
  • Population264,570 2020 Census
  • Parcels mapped136,341 checked 15 October 2026
Open the free map Click any parcel in St. Tammany Parish: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

OrleansWashingtonHancock, MSTangipahoaPearl River, MSSt. John the BaptistJeffersonSt. Bernard Covington Census outline · seat marked

Where it is

St. Tammany on the map of Louisiana

Louisiana has 64 counties and county equivalents, each with its own records office. Shapes with a page are links.

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Counties of Louisiana · St. Tammany highlighted

History

Founded in 1810

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

ST. Tammany Parish was created in 1810 by proclamation of the Territorial Governor from non-parish area within Feliciana County. The parish lost territory to the creation of St. Helena Parish in 1811, Washington Parish in 1819, and Tangipahoa Parish in 1869. In 1979, ST. Tammany gained land when boundaries through Lake Pontchartrain were defined.

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

  1. 1810
    St. Tammany Parish created St. Tammany Parish created by proclamation of the Territorial Governor from non-parish area within Feliciana County. · Gov. Proc. in Orleans Terr., Acts 1811, 3rd Leg., 2nd sess./pp. 210, 212; HRS, 23
  2. 1811
    Lost territory St. Tammany lost to St. Helena.
    to St. Helena
    · Orleans Terr. Acts 1811, 3rd Leg., 2nd sess., ch. 28/pp. 120-124
  3. 1819
    Lost territory St. Tammany lost to creation of Washington.
    to Washington
    · La. Acts 1819, 4th Leg., 1st sess., pp. 80-82
  4. 1826
    Changed Portion of the boundary between St. Tammany and Washington defined.
    Washington
    · La. Acts 1825, 7th Leg., 2nd sess., pp. 38-40
  5. 1869
    Lost territory St. Tammany lost to creation of Tangipahoa.
    to Tangipahoa
    · La. Acts 1869, 1st Leg., 2nd sess., pp. 83-86
  6. 1912
    Boundary clarified St. Tammany boundary with Washington redefined "establishing a dividing line between said Parishes in the Richard Chappel Headright No. 57, Township 4 South, Range 12 East.
    with Washingtonno change
    · La. Acts 1912, reg. sess. pp. 146-147
  7. 1979
    Gained territory St. Tammany gained when boundaries through Lake Pontchartrain were defined. · La. Acts 1979, vol. 2, reg. sess., pp. 2042, 2044-2046

Land and parcels

What the maps cover in St. Tammany

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

St. Tammany by the Census

Population
264,570 2020 Census count
Housing units
110,370 2020 Census count
Land area
845 square miles
Water area
250 square miles
People per sq mi
313 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

Zoning and code

County government

See your own lot on these maps

Open St. Tammany Parish 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 St. Tammany Parish

When was St. Tammany Parish founded?
St. Tammany Parish was founded in 1810.
What is the county seat of St. Tammany Parish?
The county seat of St. Tammany Parish is Covington.
Is there an online parcel map for St. Tammany Parish?
Yes. A public source publishes a parcel map of 136,341 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has St. Tammany Parish's boundary or name changed?
St. Tammany Parish was created in 1810. Since then the Atlas of Historical County Boundaries records 5 later changes, chiefly involving Washington Parish, St. Helena Parish and Tangipahoa Parish.
Who issues building permits in St. Tammany Parish?
The county's page on building permits: Permits and Inspections. Inside a city or town, ask that city first.
Who issues septic and well permits in St. Tammany Parish?
The county's page on septic systems and wells: Environmental Services.
Is my lot in a flood zone?
We do not have flood maps for St. Tammany Parish 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