23 March 2026

Understanding the National Archives Catalog for Genealogy Research

Graphic created using ChatGPT

If you have been following my recent series, What Morning Reports Don’t Tell You, you may have noticed that I referenced several federal record groups held by the National Archives. After reading those posts, some readers may have tried searching for those records in the National Archives Catalog and discovered that it is not always as straightforward as it first appears.

The National Archives and Records Administration (NARA) preserves the historical records of the United States federal government. These include records created or received by the President and the White House staff, the United States Congress, federal agencies, and the federal court system. Collectively, these records document the actions of the federal government and often contain valuable information for genealogists and family historians.

To help researchers locate these materials, NARA provides an online catalog that describes the records held in its facilities across the country, including the Washington, DC area, regional archives, and Presidential Libraries. The catalog is continually being expanded and updated and currently contains descriptions for the vast majority of NARA’s holdings, primarily at the series level. This means the catalog usually describes groups of records rather than individual documents.

Each week, additional descriptions and digital files are added to the catalog. In some cases, digital images of the records can be viewed directly online. In many other cases, the catalog description simply tells you what records exist and where they are located.

Genealogical Records in the National Archives

The National Archives holds many types of records that are useful for family history research. These include:

  • Applications for enrollment in Native American tribes 
  • Court records 
  • Fugitive slave cases 
  • Land records 
  • Military personnel records 
  • Naturalization records 
  • Records of federal employees
  • and those mentioned in earlier blog posts
Even though these records may contain information about individuals, the catalog itself often does not include personal names in the descriptions. This means researchers frequently need to identify the correct record series first and then examine the records themselves to determine whether a particular person appears in them.

Searching the National Archives Catalog

The National Archives Catalog can be searched online at: https://catalog.archives.gov

A simple search begins by entering keywords into the search box on the main page. If you are searching for an exact phrase, place the words in quotation marks. For example, searching for "bounty land" will return results containing that exact phrase.

After running a search, results appear with the most relevant descriptions listed first. Filters on the left side of the page can help narrow the results.

For example:

If you are looking specifically for images, you can filter for Photographs and Other Graphic Materials. 

If you want to see only records that include digital images, select Archival Descriptions with Digital Objects.

Clicking on the title of any result will open the full description of that record.

Searching for an Individual

One challenge researchers quickly encounter is that the catalog does not have a dedicated field for personal names. As a result, searching for a specific individual often requires several strategies.

Many searches will not return the person you are looking for. This does not mean the records do not exist. It simply means that the catalog description may not include that individual’s name. In those cases, you may need to search for the event or activity associated with the person and then review the records themselves.

It also helps to remember the sheer scale of the records held at the National Archives. Imagine the number of names that appear in records such as muster rolls, land files, court cases, or military personnel records. Creating a comprehensive name index for billions of federal records would be an enormous undertaking. Because of this, the catalog generally describes records at the series level rather than indexing every individual mentioned within them.

Understanding How NARA Organizes Records

One of the most important things to understand about the National Archives is how the records are arranged. NARA’s catalog is very different from a library catalog.

Instead of organizing materials by subject or author, federal records are grouped by the agency that created them. These collections are known as Record Groups (RGs).

Each Record Group represents the records of a major government entity. For example:

RG 49 – Bureau of Land Management 
RG 184 – Railroad Retirement Board 
RG 407 – Adjutant General’s Office

Within each Record Group, the records are further organized into record series. A series is a group of records created and used together for a specific purpose during a particular period of time.

These series may be arranged alphabetically, chronologically, numerically, or by subject or function. Archivists generally preserve the original order in which records were created or maintained because that arrangement can provide insight into how the records were used.

Thinking Like the Federal Government

One of the most helpful strategies when searching the National Archives Catalog is to think about how your ancestor interacted with the federal government.

For example:
  • Did your ancestor serve in the military? 
  • Were they a lighthouse keeper or postmaster? 
  • Did they file for bankruptcy? 
Understanding that relationship can guide you toward the correct agency, record group, and record series.

Once you identify the likely record group, the next step is to search for the relevant record series and then narrow your search to the specific files you need.

Example: Using the NARA Catalog to Find Lighthouse Records

To illustrate how the National Archives Catalog can be used in real research, here is the process I followed to locate lighthouse records for my great-grandfather, Frank H. Glover, who served as an assistant keeper at Point Betsie Lighthouse in Frankfort, Michigan.

This example demonstrates an important principle of NARA research. Instead of searching directly for a person’s name, researchers often need to identify the federal agency responsible for the activity and then locate the records created by that agency.

Step 1: Identify the Federal Connection

Start by asking how your ancestor interacted with the federal government.

In my case, my great-grandfather worked as a lighthouse keeper. That meant his employment was connected to the federal government agency responsible for operating lighthouses.

Step 2: Identify the Responsible Federal Agency

Once you know the federal activity, determine which government agency managed it.

Lighthouses were historically administered by the United States Lighthouse Service, which later became part of the Coast Guard. This information helps lead you to the correct Record Group at the National Archives.

Step 3: Locate the Record Group

At the National Archives, records are arranged by the agency that created them.

Lighthouse records are found in:

Record Group 26 – Records of the U.S. Coast Guard

Searching the catalog by agency or record group helps narrow the search to the correct collection of records.

Step 4: Identify the Record Series

Within each record group are multiple record series, which are groups of records created and maintained together for a specific purpose.

In this case, the relevant series was Lighthouse Log Books. These logbooks recorded daily activities at individual lighthouse stations.

Step 5: Narrow the Search

Because the catalog usually describes records at the series level, you often need to narrow your search by topic or location.

Knowing my great-grandfather worked at Point Betsie Lighthouse allowed me to focus on logbooks for that specific station.

Step 6: Access the Records

Once the catalog description identifies the record series and location, the records can be requested at the National Archives or, if digitized, viewed online. At the time of my research none of the logbooks were digitized. In fact, less than 5% of Record Group 26 is digitized.

During my visit to the National Archives in Washington, DC, I was able to examine the original lighthouse logbooks and find entries documenting my great-grandfather’s service.

Final Thoughts

The National Archives Catalog is a powerful research tool, but it works differently than the catalogs many genealogists are used to using.

Rather than searching primarily by personal names, successful research often requires identifying the federal agency involved, locating the correct record group, and then narrowing the search to the relevant record series.

Once you begin thinking about your ancestors in terms of how they interacted with the federal government, the catalog becomes much easier to navigate and it can lead you to remarkable discoveries.

For a thorough explanation on lighthouse records at NARA, see my blog post Lighting the Way: A Genealogist’s Guide to Lighthouse Records

AI Disclosure

This post reflects my own research and experiences using the National Archives Catalog. ChatGPT was used as a writing assistant for grammar, organization, title suggestions, and the creation of a supporting image.

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