Passenger lists are important primary sources of arrival data for the vast majority of immigrants to the United States in the nineteenth century. With the single exception of federal census records, passenger lists are the largest, most continuous, and the most uniform body of population records for the entire country. While researching original passenger lists can often be tedious and difficult, this Family Archive makes finding your immigrant ancestors easier than ever. It contains alphabetical listings of approximately 161,000 individuals who arrived at the port of Boston, Massachusetts from foreign ports between 1821 and 1850.