Plymouth County, founded in the year 1851, was named after the landing place of the Pilgrims who came to America on the Mayflower. It has the county seat in Le Mars. With a total area of 863.96 sq mi, it has over 24.9K people with an excellent admixture of White, Native American, black or African American, Asian, Hispanic or Latino, Pacific Islander, and others with more than 9.3K households and 6.8K families. The County is a part of the Sioux City metropolitan area.

As one of the most enhanced county records directory, the Plymouth County supplies clues regarding real estate and property facts, American Civil War history, marriage volume number, demise facts, obituary notice, origin and birth details, marriage and divorce details, burial and cemetery details, war and enlistment data, land and estate data, last will or probate specifics, World War I and II information, civil court case lookups, immigration and naturalization specifics, census data and the likes that make it possible to know more about lineage as well as the parental deeds and achievements in details.