How to Find a Land Patent Using a Plat Map | Roam Your Roots

Indexed county land ownership maps—often surfaced as hints on Ancestry.com—contain more than just a rough location of an ancestor’s home. They encode the legal land description (township, range, and section), which can be used to pull the original federal land patent from the Bureau of Land Management’s General Land Office (GLO) records database.

The process starts by locating the ancestor on the county map. In the example used, Charles Berggren’s family is tied to Wisconsin, and the map shows his position in the corner with a legal description for the township and ranges. The key step is to read the map’s land description: it identifies the township (e.g., “Township 33 north”), the range (e.g., “17 and 18”), and—most critically—the section number. The map is divided into sections, and the ancestor’s name appears within a specific section; in this case, Charles Berggren is in section 2. Once those details are extracted, the search moves away from name-based genealogy and toward land-based searching.

With the legal description in hand, the next move is to use the BLM GLO Records Search website (glo records BLM gov). Instead of searching by last name and first name, the method uses the “land description” field. The search is set to Wisconsin and then entered using the township and range, along with the section number. The result is a list of all individuals who purchased land in that exact section—an approach that can surface relatives who appear under different spellings or even different versions of a name.

In the example, the search results include “Carl Bergen,” which matches the ancestor’s Swedish name variation. The transcript notes a discrepancy between “Bergen” and “Berggren,” suggesting a transcription or spelling shift over time. Clicking the person’s accession number opens the record for that land purchase, including details about the plot and the patent.

The final step is selecting the “patent image,” which provides the actual scanned land patent document. That document confirms the land was acquired through the Homestead Act, framing the ancestor as one of the many immigrants and new settlers who benefited from the program. The payoff is twofold: the indexed county map becomes more than a locator, and the research gains a primary-source legal record tied to the exact parcel of land—turning an obscure map into a traceable chain of ownership and identity.