The term “section” is a foundational unit in U.S. land surveying. In farmland contexts, understanding how many acres are in a section helps with pricing, planning, and legal descriptions. This guide explains the standard size, common variations, and practical calculations for farmers, landowners, and buyers.
Overview Of The Public Land Survey System
Most farmland in the continental United States uses the Public Land Survey System (PLSS). This system divides land into townships and sections to create uniform legal descriptions. A township spans six miles on each side, totaling 36 square miles. Each township contains 36 sections arranged in a 6 by 6 grid. This framework provides a consistent reference for ownership records, taxation, and agricultural planning.
What Is A Section
A section is a square tract of land defined by the PLSS. In the standard framework, a section measures one mile by one mile. That makes each section cover 640 acres. The 640-acre size is the baseline used in most land deals, farm leases, and government records. The term “section” is commonly used in land descriptions like “Section 12, Township 4 North, Range 5 West.”
Standard Size Of A Section
The canonical size of a section is:
- 640 acres per section
- One square mile per quarter of a section, or 160 acres
These measurements assume a perfectly aligned, unbroken section with regular grid lines. In practice, surveys may show minor irregularities due to terrain, historical surveying techniques, or natural features that affect boundaries.
Variations And Subdivisions
While 640 acres is the standard, sections can be subdivided into quarters and smaller parcels. The most common subdivisions are:
- Quarter section = 160 acres
- Half section = 320 acres
- Sixteenth section = 40 acres
Further subdivisions are possible, depending on local practices and land records. For example, a quarter-section might be divided into four 40-acre parcels, each with its own legal description. Buyers should verify the exact parcel boundaries with the county recorder or a licensed surveyor before transactions.
Common Confusions
Several terms can be confusing for those new to land descriptions. The following clarifications help prevent misinterpretation:
- Section vs. township vs. range: A township is a 6-by-6 mile square; it contains 36 sections. Townships are identified by their compass direction relative to the base line and principal meridian.
- Square miles vs. acres: One section is one square mile, which equals 640 acres. A square mile is 640 acres, but a mile on a map does not always translate to a perfectly equal ground area due to surveying nuances.
- Irregular boundaries: Natural features (rivers, hills) or historical survey adjustments can create nonstandard parcel shapes within a section, though the overall area may still approximate 640 acres.
Quick Calculations And Examples
Practical calculations help in pricing, leasing, and management. Here are simple scenarios:
- How many acres in a full section? 640 acres.
- How many acres in a quarter section? 160 acres.
- How many acres remain if a 40-acre tract is sold from a 640-acre section? 600 acres remain; note that actual remaining parcels may be noncontiguous if subdivisions occur.
- How to verify a parcel size described as “the NW quarter of Section 12”? It is 160 acres (the NW quarter equals 1/4 of 640).
Practical Tips For Farmers And Landowners
To manage land effectively, consider these practices:
- Obtain a current survey or plat map from the county assessor or a licensed surveyor to confirm boundaries and acreages.
- Use digital land records or GIS data where available to visualize parcel shapes and neighbor boundaries.
- When planning leases or purchases, ensure legal descriptions align with actual surveyed boundaries to avoid disputes.
- Be aware of easements, right-of-way, and mineral rights, which can affect usable acreage even within a standard section.
- Consult local stakeholders for any region-specific variations in PLSS practices or terminology.
Infographic-Ready At-a-Glance
| Parcel Type | Size (acres) | Notes |
|---|---|---|
| Section | 640 | One square mile; standard unit in PLSS |
| Quarter Section | 160 | Common subdivision unit |
| Half Section | 320 | Used in larger tracts or leases |
| Sixteenth Section | 40 | Smaller parcels for precise allocations |
Conclusion
In U.S. farmland contexts, a standard section equals 640 acres. Subdivisions into quarters, halves, and sixteenths are common for ownership and leasing. For accurate land management, confirm boundaries with official surveys and records, and be mindful of potential irregularities due to terrain or historic adjustments. The 640-acre section remains a foundational reference for pricing, planning, and legal descriptions in farm land transactions.