Cyndi's List of Genealogy Sites on the Internet is a categorized and cross-referenced list of links for genealogical research. The site contains roughly 332,000 links in more than 200 categories. These numbers are always increasing as new links and categories are added.

Possibly the most valuable resource at Family Search.org, the Family Search Catalog details to the holdings of the world's largest genealogical collection held at the Family History Library in Salt Lake City, UT. More and more of the collection is being digitized and made available to the public either directly or through local Family History Centers. Instead of starting your search with a surname, a more valuable result can often be obtained with a locality search. Remember, the records themselves are not indexed, therefore they will not show up in a surname search.

The FamilySearch Research Wiki is a free, online genealogical guide created and maintained by FamilySearch, a non-profit organization. It contains links to genealogy databases, websites, other resources, research strategies, and genealogical guidance to assist in the search for your ancestors.

The Library of Congress is the largest library in the world, with millions of books, recordings, photographs, newspapers, maps and manuscripts in its collections. The Library is the main research arm of the U.S. Congress and the home of the U.S. Copyright Office. The Library preserves and provides access to a rich, diverse and enduring source of knowledge to inform, inspire and engage you in your intellectual and creative endeavors. Whether you are new to the Library of Congress or an experienced researcher, we have a world-class staff ready to assist you online and in person.

The Midwest Genealogy Center (MGC) is one of the United States' preeminent resources for family history, providing access to almost three-quarters of a million on-site materials. MGC features 52,000 square feet of space that houses all of the free resources needed to research your family history. MGC’s collections offer resources for genealogy research that span the United States and countries around the world. MGC also houses a uniquely expansive circulating collection and almost completely open stacks. You’ll find access to databases, scanning and digitization stations, oral history recording kits, microfilm reader scanners, and more.

Part of the Missouri State Archives, Missouri Digital Heritage includes more than 9 million records can be accessed through Missouri Digital Heritage, including the collections of the Missouri State Archives, the Missouri State Library and other institutions from across the state.

The Library & Research Center is a multiuse facility that houses the Missouri Historical Society’s vast collections and provides visitors with access to research materials. To learn more, read about the building’s history, peruse policies and guidelines, or visit the Media Room.

Located in Jefferson City, MO, the Missouri State Archives is the repository for state records of historical value. Highlights among manuscripts and original documents in the Archives include French & Spanish land grants, testimony concerning the New Madrid earthquake of 1811-1812, maps of Missouri's first surveyed roads, Missouri's Ordinance Abolishing Slavery, and material pertaining to Harry S. Truman. Currently, the Archives holds more than 336 million pages of paper; 829,000 photographs; 9,000 maps; 68,000 reels of microfilm, 1,000 cubic feet of published state documents and 1,000 audio/video items. Numerous databases are also available to aid family historians in their search.

MoSGA is Missouri's state genealogy society and, as such, is dedicated to enhancing the knowledge of its members and the public in the study of family history, genealogical records and the principles of sound genealogical research.

The National Archives and Records Administration (NARA) is the nation's record keeper. Of all documents and materials created in the course of business conducted by the United States Federal government, only 1%-3% are so important for legal or historical reasons that they are kept by us forever. Those valuable records are preserved and are available to you, whether you want to see if they contain clues about your family’s history, need to prove a veteran’s military service, or are researching a historical topic that interests you.

The National Genealogical Society (NGS) library holdings are housed in Special Collections at St. Louis County Library in St. Louis, Missouri. The entire collection is available to the general public in person, and non-reference volumes may be borrowed with Interlibrary Loan (ILL) through a local library.

The Ozark Regional Library in Ironton has a genealogy room with a great collection of books; microfilmed records of local newspapers, county records, census records, and much more. Among their other resources are subscriptions to Ancestry Library Edition and Heritage Quest, as well as its own history project, Ozark Regional History.

From the Family Search Wiki, "The Periodical Source Index, or PERSI, is the largest subject index to genealogy and local history periodical articles in the world. Created by the staff of the Allen County Public Library Foundation and the ACPL’s Genealogy Center, PERSI is widely recognized as a vital tool for genealogical researchers. PERSI indexes articles in 11,000 periodical titles (including 3,000 defunct titles) published by thousands of local, state, national and international societies and organizations, arranging 2.7 million entries by surname or location and 22 basic subject headings.... PERSI is searchable at Findmypast.com. The index list of results is free to the public. To see any online images to the periodicals, you must have a subscription or need to purchase pay-per-view credits."

The mission of the State Historical Society of Missouri is to collect, preserve, publish, exhibit, and make available material related to all aspects and periods of Missouri history. SHSMO also seeks to generate interest in and appreciation of the rich cultural heritage of the state and its people through education and outreach. Research centers in Cape Girardeau, Columbia, Kansas City, Rolla, Saint Louis, and Springfield provide access to an ever-growing number of reference materials and historical collections.

The State Historical Society of Missouri manuscript collection consists of personal papers, photographs, oral histories, correspondence, diaries and journals, and audiovisual material, as well as the records of churches, organizations, and businesses. These materials provide researchers an insight into the lives of Missourians and the development of organizations and businesses throughout Missouri. While a given entry may be located at one Research Center, a request can be submitted to have it sent to a Research Center closer to where you live in Missouri.