Welcome to the CongressData App

  • This app lets you manipulate, explore, and download the CongressData dataset by Matt Grossmann, Caleb Lucas, Josh McCrain, and Ian Ostrander at the Institute for Public Policy and Social Research at Michigan State University.
  • We created two associated R packages as well: a functional package called congress and a data-only package called congressData
  • The main dataset is comprised of member-years and combines hundreds of variables from numerous sources. Individual variable coverage varies, but the dataset includes information regarding all congressional districts between 1789-2021. Specifically, the dataset tracks characteristics of congressional districts, the members of congress themselves, and the behavior of those members in policymaking.
  • Use the Subset & Download tab to dynamically generate downloadable portions of the data based on several user inputs. You can also generate a codebook with descriptions and citations (bib, plain text) for each of variables you download.
  • Use the Aggreate, Subset, & Download (Congress-Level) tab to dynamically generate a version of the dataset aggregated to the member-session level. You can choose how to aggregate and vary that choice across different datasets within CongressData. You can also generate a codebook with descriptions and citations (bib, plain text) for each of variables you download.
  • The CongressData codebook is available here.
  • This aggregated dataset is only possible because many scholars and students have spent countless hours creating, collecting, cleaning, and making data publicly available. Thus, if you use the dataset, please cite the original data sources. You can use this web application or our R package to do so.
    • For example, if you use the Congressional Committee Assignments data (Stewart and Woon, 2017), please cite: Charles Stewart III and Jonathan Woon. Congressional Committee Assignments, 103rd to 114th Congresses, 1993--2017: House of Representatives, 2017.
  • If you use CongressData or this app, in addition to individual data sources that you use, please cite:
    • Grossmann, M., Lucas, C., McCrain, J, & Ostrander, I. (2022). CongressData. East Lansing, MI: Institute for Public Policy and Social Research (IPPSR)


Related To*:
*Use 'Related To' to search a variable's name, short/long descriptions from the codebook, and its citation for non-exact matches of a search term. For example, searching 'tax' will return variables with words like 'taxes' and 'taxable' in any of those columns.
  • All inputs update the data in real-time.
  • Use the Variable Matches tab to see a list of each of the matched variables, along with a short description. The list of variable matches updates dynamically.
  • Use the Download Citations & Codebook tab to download the cites/codebook associated with the variables that result from your search.


  • Download a CSV with the variables from your search; their citations in both BibTeX and plain text; and information regarding their coding with the button below.
  • Please verify the citations are correct, as some errors may exist. Not all citations are available.
  • If you use this app, in addition to individual data sources that you use, please cite:
    • Grossmann, M., Lucas, C., McCrain, J, & Ostrander, I. (2022). CongressData. East Lansing, MI: Institute for Public Policy and Social Research (IPPSR)
Related To*:

*Use 'Related To' to search a variable's name, short/long descriptions from the codebook, and its citation for non-exact matches of a search term. For example, searching 'tax' will return variables with words like 'taxes' and 'taxable' in any of those columns.
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  • You will have the option to download your search result after clicking the EXECUTE button for the first time. Use that button to update your search result.
  • The column names in your downloadable result will reflect the aggregation choices you made.
  • Use the Variable Matches tab to see a list of each of the matched variables, along with a short description. The list of variable matches updates dynamically.
  • Use the Download Citations & Codebook tab to download the cites/codebook associated with the variables that result from your search.

Alternatively, you can download all versions of the aggregated CongressData (each using a different aggregation method) with the button below:


Variable matches will appear after executing a search using the options in the sidebar.

  • Download a CSV with the variables from your search; their citations in both BibTeX and plain text; and information regarding their coding with the button below.
  • Please verify the citations are correct, as some errors may exist. Not all citations are available.
  • If you use this app, in addition to individual data sources that you use, please cite:
    • Grossmann, M., Lucas, C., McCrain, J, & Ostrander, I. (2022). CongressData. East Lansing, MI: Institute for Public Policy and Social Research (IPPSR)