How do I know whether an Indiana description uses the First or Second Principal Meridian?

The meridian is usually stated in the description as '1st Meridian' or '2nd Meridian' If it is not stated, eastern Indiana counties generally use the First Principal Meridian and western and central counties use the Second. The approximate dividing line runs north-south through the middle of the state.

Why is Indiana historically significant for the PLSS system?

Indiana contains the First Principal Meridian, which was the very first meridian established under the Land Ordinance of 1785. The initial point, set in 1796 at the intersection of the Ohio River and the western boundary of the original surveys, launched the rectangular system that would eventually cover more than 1.5 billion acres of the American West.

Why do some early Indiana surveys have irregular sections?

The earliest surveys under the First Principal Meridian, conducted in the 1790s and early 1800s, used less precise methods than later surveys. Some southeastern Indiana townships show accumulated measurement errors that were corrected by later resurveys. These irregularities are recorded on the original GLO plats and carry forward into the title chain for affected properties.

Can I convert Indiana PLSS descriptions for oil lease work in southern Indiana?

Yes. Southern Indiana oil leases reference Second Principal Meridian PLSS descriptions for the leased tracts. Enter the section, township, and range from the lease to map the affected parcel. For lease inventories covering multiple tracts, use batch conversion to process all descriptions at once.

Indiana PLSS Converter — Section Township Range to GPS

Convert Indiana Public Land Survey System (PLSS) land descriptions to GPS coordinates using the First / Second Principal system.

Convert Indiana Land Descriptions

Enter a Indiana PLSS land description to get GPS coordinates instantly.

Example: SW 11 3N 5E 2nd Meridian

Open the converter

Understanding Indiana's PLSS System

Indiana is one of the earliest states to be systematically surveyed under the Public Land Survey System, and it bears the marks of that pioneering history in ways that still affect title research today. Indiana is covered by two principal meridians: the First Principal Meridian, established in 1796 as the very first meridian in the PLSS system, governs the eastern portion of the state. The Second Principal Meridian, established in 1805 near Vincennes, governs the western and central portions. The First Principal Meridian's initial point — set at the intersection of the Ohio River and the boundary of the original Northwest Territory surveys — made Indiana ground zero for the American experiment in rectangular land surveying.

The historical complexity of Indiana's early surveys is reflected in the patchwork of survey districts that covers the state. The First Principal Meridian surveys were among the earliest and least precise in the system, conducted before survey methods were fully standardized. Some Indiana descriptions — particularly in the southeastern counties — show irregularities and correction adjustments that were built into later surveys to account for early errors. The Second Principal Meridian surveys in the western counties, conducted somewhat later, show improved consistency, though the heavily forested terrain slowed field work considerably.

Indiana's agricultural economy, anchored by corn, soybeans, and hogs, drives constant PLSS-based land transactions across all 92 counties. The state's industrial corridor along Lake Michigan — Gary, Hammond, and East Chicago — sits on land originally surveyed under the First Principal Meridian and now described in a mix of underlying PLSS descriptions and subsequent industrial platting. Rural southern Indiana, with its limestone karst topography and scattered oil production, presents some of the most varied land description challenges in the state.

Principal Meridians

First Principal Meridian Second Principal Meridian

Common Use Cases in Indiana

Who converts Indiana PLSS descriptions — and why.

Agricultural Farmland Sales and Leasing

Indiana's corn and soybean belt generates a high volume of farmland transactions every year. Purchase agreements, cash rent negotiations, FSA farm records, and agricultural lending all require accurate PLSS descriptions tied to GPS boundaries. Converting First and Second Principal Meridian descriptions to GPS supports acreage verification and field mapping for buyers, sellers, and lenders.

Industrial and Brownfield Redevelopment

Indiana's Lake Michigan industrial corridor contains some of the largest brownfield sites in the Midwest. Environmental site assessments, remediation boundary surveys, and redevelopment permit applications all trace back to original PLSS descriptions in the underlying deeds. GPS conversion is the first step in establishing a reliable site boundary before any Phase II work begins.

Oil and Gas Production in Southern Indiana

Southern Indiana has active and legacy oil production in the Illinois Basin, particularly in Knox, Gibson, Pike, and Warrick counties. Oil lease descriptions and surface use agreements reference PLSS descriptions under both meridians. Converting these to GPS supports lease mapping, royalty verification, and Indiana DNR regulatory filings.

Rural Residential and Recreational Property

Southern Indiana's hills, lakes, and forests attract significant recreational real estate activity. Properties along Monroe Reservoir, Patoka Lake, and the Hoosier National Forest are described in PLSS terms. GPS conversion helps buyers and their title companies verify that described parcels match fences, access drives, and the physical boundaries visible on the ground.

Industries: AgricultureOil & GasReal Estate

How to Convert Indiana Legal Descriptions

Three steps from legal description to GPS coordinates.

Enter your Indiana legal description

Type or paste your description and include the meridian. A western Indiana description reads: SW 11 3N 5E 2nd Meridian. An eastern Indiana description reads: NE 22 8N 14E 1st Meridian. Including the meridian is important because both the First and Second Principal Meridians are active in Indiana, and the correct meridian affects the geographic result.

Verify the map result

The converter plots the parcel on an interactive map. Eastern Indiana descriptions use the First Principal Meridian; western and central Indiana descriptions use the Second. A wrong meridian designation can shift the result significantly, so always check the map before exporting.

Export for your use case

Download coordinates as CSV, KML, or GeoJSON. Indiana agricultural professionals commonly import into FSA portal tools and precision agriculture platforms; title companies export to county auditor GIS viewers; environmental consultants export to site assessment mapping software.

Processing an Indiana county farmland database, an oil lease inventory in southern Indiana, or a portfolio spanning both meridians? Batch conversion handles any number of First or Second Principal Meridian descriptions from a single CSV upload.

Learn about batch conversion

Frequently Asked Questions

Common questions about Indiana PLSS descriptions and conversion.

Indiana uses two principal meridians: the First Principal Meridian (eastern Indiana counties) and the Second Principal Meridian (western and central Indiana counties). The First Principal Meridian was the very first established in the PLSS system, with its initial point at the Ohio River boundary of the original Northwest Territory.