LaSalle Parish, LA zoning map, flood zone and property lines by address
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Towns in LaSalle Parish: Jena, Olla, Urania.
Flood zone by address
ParcelSheet reads FEMA's National Flood Hazard Layer at the lot: the zone, whether it is a high risk area where lenders ask for flood insurance, and the base flood elevation where FEMA lists one. FEMA's parishwide study for LaSalle Parish has 30 FIRM panels, the newest effective February 2023; no coastal V zones are mapped in it.
The official panel and any Letter of Map Amendment are at FEMA's Map Service Center. An elevation certificate for a LaSalle house comes from a licensed surveyor and is often on file with the parish or city building office.
Property lines
The parcel outline, parcel number and mapped size come from the Louisiana parish parcel layers (each parish publishes its own), so a LaSalle lot shows the same lines the parish assessor draws. LaSalle Parish covers about 399,906 acres of land and 24,131 acres of water.
Mapped lines are approximate. The LaSalle Parish assessor keeps the parcel record; a licensed surveyor sets the true corners.
Zoning
LaSalle Parish zones its unincorporated land, and Jena, Olla, Urania each zone the land inside their limits. ParcelSheet shows the use the parish assessor lists for the lot and links the parish planning and zoning office for the district, the uses it allows and the lot size it needs.
ADU and guest houses
Under Louisiana's parish zoning law (Louisiana Revised Statutes 33:4780.40 and following), local governments can allow an accessory dwelling unit on a lot with a house. Whether a LaSalle lot can add one depends on its district; the parish planning and zoning office has the rule. ParcelSheet shows the mapped lot size and the ground's slope, the first two things the question turns on.
Septic and soil
ParcelSheet reads the USDA soil survey at the lot: the soil's name, its septic absorption rating and whether it is prime farmland. LaSalle Parish is soil survey area LA059, LaSalle Parish, Louisiana, last updated September 2026, on Web Soil Survey.
A new or changed septic system in LaSalle Parish needs a permit from the LaSalle Parish health unit sanitarian (Louisiana Department of Health onsite wastewater program).
Setbacks
Setbacks in LaSalle Parish come from the zoning district: the front, side and rear distances a house must keep. ParcelSheet does not draw setback lines; the parish zoning office gives them for the lot's district, and Jena, Olla, Urania for land inside their limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a LaSalle lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in LaSalle Parish?
Type the address in the box above and ParcelSheet reads FEMA's flood zone at the lot's center. FEMA's parishwide flood map for LaSalle Parish has 30 panels, the newest effective February 2023. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in LaSalle Parish?
Open the Louisiana map, type the address, and the parcel outline from the LaSalle Parish assessor shows on the map with its parcel number and mapped size. Mapped lines are approximate; only a licensed surveyor sets the true corners.
What is my property zoned in LaSalle Parish?
Zoning in LaSalle Parish is set by the parish for unincorporated land and by each city (such as Jena, Olla) inside its own limits. ParcelSheet shows the use code the parish assessor lists and links the office that sets the zoning; the planning office has the final word.
Can I build an ADU in LaSalle Parish?
Under Louisiana's parish zoning law (Louisiana Revised Statutes 33:4780.40 and following), parishes and cities can allow an accessory dwelling unit, and each sets its own rules. In LaSalle Parish ask the zoning office for the lot's district first; ParcelSheet shows the lot size as mapped so you can see the room you have.
Do I need a septic permit in LaSalle Parish?
Yes. A new or changed septic system in LaSalle Parish needs a permit from the LaSalle Parish health unit sanitarian (Louisiana Department of Health onsite wastewater program). ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area LA059 (LaSalle Parish, Louisiana).
What can I build on 5 acres in LaSalle Parish?
Zoning in LaSalle Parish is set by the parish for unincorporated land and each city inside its own limits (such as Jena, Olla). The zoning district decides the uses, how many homes and the smallest lot it allows on 5 acres. ParcelSheet shows the lot size as mapped and the use code on the parcel record; the planning office has the district and its rules.
What are the residential setbacks in LaSalle Parish (2026)?
Setbacks in LaSalle Parish come from the zoning code of the parish, or of the city when the lot is inside city limits: the front, side and rear distances depend on the lot's district. ParcelSheet does not draw setback lines or give a number it did not read; the zoning office gives them for the district.
Next to LaSalle Parish: Avoyelles Parish, Caldwell Parish, Catahoula Parish, Grant Parish, Rapides Parish, Winn Parish.
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