How do I know which California meridian to use?

The county location is the best guide. All Southern California counties (Los Angeles, San Diego, Riverside, San Bernardino, Orange, Ventura, Imperial, and most of Kern) use the San Bernardino Meridian. All Northern and Central California counties (including San Francisco Bay Area, Sacramento Valley, Sierra Nevada, and most of the North Coast) use the Mount Diablo Meridian. Del Norte and portions of far northwestern counties use the Humboldt Meridian. The meridian should be stated in the legal description.

What are California ranchos and how do they affect PLSS descriptions?

Spanish and Mexican land grants (ranchos) were made before California's PLSS survey and were adjudicated by the Board of Land Commissioners under the Land Act of 1851. Confirmed ranchos are excluded from the PLSS grid and are described by rancho name and metes-and-bounds rather than section, township, and range. PLSS descriptions apply to parcels outside confirmed rancho boundaries.

Can I convert California agricultural land descriptions?

Yes. Central Valley agricultural land is described under the Mount Diablo Meridian. Enter the standard PLSS description — for example, SW 30 13S 20E Mount Diablo Meridian — and the converter returns the GPS centerpoint. For irrigation district records and water rights, the same format applies.

How do I process multiple California PLSS descriptions at once?

Use Township America's batch conversion tool. Upload a CSV with your descriptions, including the correct meridian for each row, and download results with GPS coordinates appended. This is the standard approach for large real estate due diligence projects, title company searches, and mineral rights audits.

California PLSS Converter — Section Township Range to GPS

Convert California Public Land Survey System (PLSS) land descriptions to GPS coordinates using the Humboldt / Mount Diablo / San Bernardino system.

Convert California Land Descriptions

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

Example: NE 18 2S 6E Mount Diablo Meridian

Open the converter

Understanding California's PLSS System

California is one of the most complex PLSS states in the country, governed by three distinct principal meridians that divide the state into separate survey systems. The Mount Diablo Meridian, established in 1851 at Mount Diablo in Contra Costa County, is the primary reference system and covers the Central Valley, the Bay Area, the Sierra Nevada, and most of northern California. The San Bernardino Meridian, established in 1852 at San Bernardino, governs all of Southern California from the Tehachapi Mountains south to the Mexican border. The Humboldt Meridian covers a compact area in the northwestern corner of the state (Del Norte and portions of Humboldt and Trinity counties), reflecting the remote nature of that region during the original survey.

Identifying the correct meridian is the essential first step in working with any California PLSS description. A description in Fresno County references the Mount Diablo Meridian; the same township and range numbers in San Diego County reference the San Bernardino Meridian and will locate to an entirely different part of the state. The boundary between the two primary survey systems runs roughly east-west along the Tehachapi Mountains — Kern County itself has parcels under both meridians, split by the range.

California's PLSS also reflects the complexity of the state's pre-statehood land history. Spanish and Mexican ranchos covered much of coastal California and portions of the valleys, and the Land Act of 1851 established a commission to adjudicate those claims. Confirmed ranchos were excluded from the PLSS grid, appearing as irregular survey remnants within the otherwise regular township-and-range framework. Title research in coastal California often requires determining whether a parcel is within a confirmed rancho or in the standard PLSS survey.

Principal Meridians

Humboldt Meridian Mount Diablo Meridian San Bernardino Meridian

Common Use Cases in California

Who converts California PLSS descriptions — and why.

Real Estate Due Diligence and Title Research

California real estate transactions — particularly for rural, agricultural, and undeveloped land — rely on PLSS legal descriptions. Title companies, real estate attorneys, and buyers use PLSS-to-GPS conversion to verify parcel locations, confirm boundary descriptions against recorded maps, and identify the correct survey system before closing.

Timber and Natural Resource Management

Northern California's timber industry, managed through the California Department of Forestry and Fire Protection (CAL FIRE) timber harvest plan process, references PLSS descriptions for harvest unit boundaries, stream exclusion zones, and road locations. Accurate GPS conversion is a routine part of THI preparation and review.

Mining Claims and Mineral Rights

California's historic gold fields, active quarries, and BLM-managed mineral estate are all described in PLSS terms. Mining claim location monuments reference section, township, and range, and BLM mineral lease parcels use the same format. Converting these descriptions to GPS is essential for claim boundary verification and lease mapping.

Agricultural Land and Water Rights

The Central Valley — one of the most productive agricultural regions in the world — is described entirely in PLSS terms under the Mount Diablo Meridian. Farm sales, irrigation district records, and State Water Resources Control Board water rights all reference PLSS legal descriptions. GPS conversion is standard practice for land and water management in the valley.

Industries: Real EstateAgricultureTimberMining

How to Convert California Legal Descriptions

Three steps from legal description to GPS coordinates.

Enter your legal description and specify the correct meridian

Type or paste your California PLSS description. For Central Valley or Northern California: NE 18 2S 6E Mount Diablo Meridian. For Southern California: SE 14 3S 4W San Bernardino Meridian. For the far northwest: NW 9 8N 2E Humboldt Meridian. Including the correct meridian is critical — the same township and range numbers mean different locations under different meridians.

Review the GPS coordinates and map

The converter returns GPS coordinates and displays the parcel on an interactive map. Verify that the result falls in the expected general area of California before using the coordinates downstream. If the result looks wrong, check whether you specified the correct meridian.

Export or save your results

Download coordinates as CSV, KML, or GeoJSON for use in GIS platforms, GPS devices, or title research tools. Save locations to a project to keep related parcels organized — useful for large agricultural portfolios, mining claim sets, or multi-parcel real estate transactions.

California land research often involves large numbers of PLSS descriptions across multiple meridians. Batch conversion processes your entire CSV at once — specify the meridian for each row to ensure accurate results across all three California survey systems.

Learn about batch conversion

Frequently Asked Questions

Common questions about California PLSS descriptions and conversion.

California is covered by three principal meridians: the Mount Diablo Meridian (most of Northern and Central California), the San Bernardino Meridian (Southern California, roughly south of the Tehachapi Mountains), and the Humboldt Meridian (the far northwestern corner of the state in Del Norte and portions of Humboldt and Trinity counties).