Census of Population and Housing, 1980: Summary Tape File 3A

This data collection is a component of Summary Tape File 3, which consists of four sets of data containing detailed tabulations of the nation's population and housing characteristics produced from the 1980 Census. The STF 3 files contain sample data inflated to represent the total United States population. The files also contain 100-percent counts and unweighted sample counts of persons and housing units. All files in the STF 3 series are identical, containing 321 substantive data variables organized in the form of 150 "tables," as well as standard geographic identification variables. Population items tabulated for each person include demographic data and information on schooling, ethnicity, labor force status, and children, as well as details on occupation and income. Housing items include size and condition of the housing unit as well as information on value, age, water, sewage and heating, vehicles, and monthly owner costs. Each dataset provides different geographic coverage. STF 3A provides summaries for the states or state equivalents, counties or county equivalents, minor civil divisions (MCDs) or census county divisions (CCDs), places or place segments within MCD/CCDs and remainders of MCD/CCDs, census tracts or block numbering areas and block groups or, for areas that are not block numbered, enumeration districts, places, and congressional districts. There are 52 files, one for each state, the District of Columbia, and Puerto Rico. The information in the file for Puerto Rico is similar to but not identical to the data for the 50 states and the District of Columbia. Thus, this file is documented in a separate codebook. The Census Bureau's machine-readable data dictionary for STF 3 is also available through CENSUS OF POPULATION AND HOUSING, 1980 [UNITED STATES]: CENSUS SOFTWARE PACKAGE (CENSPAC) VERSION 3.2 WITH STF4 DATA DICTIONARIES (ICPSR 7789), the software package designed specifically by the Census Bureau for use with the 1980 Census data files.

本数据集为汇总磁带文件3（Summary Tape File 3，STF3）的组成部分，由四组数据构成，包含基于1980年美国人口普查生成的全国人口与住房特征详细制表结果。STF3文件包含经加权处理以代表全美总人口的抽样数据，同时涵盖人口与住房单元的百分百全量计数及未加权抽样计数。STF3系列下的所有文件格式统一，均包含321项实体数据变量，以150张“表格”的形式组织，并附带标准地理识别变量。
针对个人的统计人口项包括人口统计数据、受教育情况、族裔、劳动力状况、子女相关信息，以及职业与收入细节。住房相关统计项则涵盖住房单元的规模与状况，同时包含房产价值、房龄、供水、排污与供暖设施、车辆拥有情况，以及月度自住成本等信息。
各数据集的地理覆盖范围各有不同。STF3A可提供以下层级区域的汇总数据：州或州级等效区域、县或县级等效区域、次级民政分区（Minor Civil Divisions，MCDs）或普查县分区（Census County Divisions，CCDs）、次级民政分区/普查县分区内的建制市或市辖区，以及次级民政分区/普查县分区的剩余区域、普查区或街区编号区与街区组；对于未进行街区编号的区域，则涵盖普查分区、建制市以及国会选区。
本系列共有52个文件，分别对应50个州、哥伦比亚特区及波多黎各各一份。波多黎各对应文件中的信息与50个州及哥伦比亚特区的数据类似但不完全一致，因此该文件配有独立的编码手册。
美国人口普查局针对STF3的机器可读数据字典，可通过《1980年美国人口与住房普查：搭配STF4数据字典的普查软件包（CENSPAC）版本3.2》（ICPSR 7789）获取，该软件包由普查局专为1980年人口普查数据文件开发。