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Parish · code 22101

St. Mary ParishLouisiana

St. Mary Parish is a parish in Louisiana, located in the south-central part of the state with Franklin as its seat. It was formed in 1811 and named after Mary.

  • Founded1811
  • County seatFranklin
  • Named forMary
  • Land area556 sq mi + 564 sq mi water
  • Population49,406 2020 Census
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Updated

IberiaAssumptionSt. MartinTerrebonne Franklin Census outline · seat marked

Where it is

St. Mary on the map of Louisiana

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

Acadia ParishAllen ParishAscension ParishAssumption ParishAvoyelles ParishBeauregard ParishBienville ParishBossier ParishCaddo ParishCalcasieu ParishCaldwell ParishCameron ParishCatahoula ParishClaiborne ParishConcordia ParishDe Soto ParishEast Baton Rouge ParishEast Carroll ParishEast Feliciana ParishEvangeline ParishFranklin ParishGrant ParishIberia ParishIberville ParishJackson ParishJefferson ParishJefferson Davis ParishLafayette ParishLafourche ParishLaSalle ParishLincoln ParishLivingston ParishMadison ParishMorehouse ParishNatchitoches ParishOrleans ParishOuachita ParishPlaquemines ParishPointe Coupee ParishRapides ParishRed River ParishRichland ParishSabine ParishSt. Bernard ParishSt. Charles ParishSt. Helena ParishSt. James ParishSt. John the Baptist ParishSt. Landry ParishSt. Martin ParishSt. Tammany ParishTangipahoa ParishTensas ParishTerrebonne ParishUnion ParishVermilion ParishVernon ParishWashington ParishWebster ParishWest Baton Rouge ParishWest Carroll ParishWest Feliciana ParishWinn ParishSt. Mary Parish St. Mary
Counties of Louisiana · St. Mary highlighted

History

Founded in 1811

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

St. Mary Parish was created on April 17, 1811, within Attakapas County from the extinct Attakapas Parish. The parish gained territory from St. Martin in 1813 and later lost land to the creation of Iberia Parish in 1868. In 1954, St. Mary's boundary was extended three marine leagues into the Gulf of Mexico, making the parish boundary coextensive with the state's gulfward boundary.

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

  1. 1811
    St. Mary Parish created St. Mary Parish created within Attakapas County from Attakapas Parish (extinct), which was eliminated.
    from Attakapas
    · Orleans Terr. Acts 1811, 3rd Leg., 2nd sess., ch. 24/pp. 104-106
  2. 1813
    Gained territory St. Mary gained from St. Martin.
    from St. Martin
    · La. Acts 1812-1813, 1st Leg., 2nd sess., p. 134
  3. 1837
    Boundary clarified St. Mary boundary with Assumption redefined (no change).
    with Assumptionno change
    · La. Acts 1837, 13th Leg., 1st sess., p. 22-23
  4. 1868
    Lost territory St. Mary lost to creation of Iberia.
    to Iberia
    · La. Acts 1868, 1st Leg., 1st sess., pp. 272-273
  5. 1954
    Changed St. Mary boundary extended three marine leagues into the Gulf of Mexico making the parish boundary coextensive with the gulfward boundary of the State of Louisiana. Act passed 21 June 1954, became effective 30 July 1954. · La. Acts 1954, reg. sess., pp. 62-63

Land and parcels

What the maps cover in St. Mary

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. Mary by the Census

Population
49,406 2020 Census count
Housing units
22,407 2020 Census count
Land area
556 square miles
Water area
564 square miles · 50% of the county, including large bodies of water
People per sq mi
89 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.

Zoning and code

County government

See your own lot on these maps

Open St. Mary 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. Mary Parish

When was St. Mary Parish founded?
St. Mary Parish was founded in 1811, and named after Mary.
What is the county seat of St. Mary Parish?
The county seat of St. Mary Parish is Franklin.
Is there an online parcel map for St. Mary Parish?
Not that we have found yet. Lot lines and owners of record are kept by the county assessor's office. When a public parcel map appears, it shows here.
Has St. Mary Parish's boundary or name changed?
St. Mary Parish was created in 1811. Since then the Atlas of Historical County Boundaries records 3 later changes, chiefly involving Iberia Parish and St. Martin Parish.
Is my lot in a flood zone?
We do not have flood maps for St. Mary 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