The Census Tree, 1850-1860

The Census Tree is the largest-ever database of record links among the historical U.S. censuses, with over 700 million links for people living in the United States between 1850 and 1940. These links allow researchers to construct a longitudinal dataset that is highly representative of the population, and that includes women, Black Americans, and other under-represented populations at unprecedented rates. Each .csv file consists of a crosswalk between the two years indicated in the filename, using the IPUMS histids. For more information, consult the included Read Me file, and visit https://censustree.org.<br>

人口普查树（Census Tree）是迄今规模最大的美国历史人口普查记录关联数据库，涵盖1850年至1940年间居住在美国的人口的逾7亿条关联记录。这些关联记录可帮助研究人员构建极具人群代表性的纵向数据集，且该数据集收录女性、非裔美国人及其他代表性不足群体的占比达到前所未有的水平。每个.csv文件均包含一份对应文件名中所示两个年份的关联映射表，且采用IPUMS历史标识号（histids）。如需了解更多信息，请查阅随附的自述文件，并访问https://censustree.org。