{"meta":{"dataset":"crosswalks","title":"Legal market crosswalks: practice areas, federal case codes, states, federal districts and counties","version":"1.1.0","doi":"10.5281/zenodo.23744618","doiUrl":"https://doi.org/10.5281/zenodo.23744618","conceptDoi":"10.5281/zenodo.23741881","license":"CC BY 4.0","licenseUrl":"https://creativecommons.org/licenses/by/4.0/","attribution":"Source: Probative, Legal market crosswalks: practice areas, federal case codes, states, federal districts and counties, version 1.1.0, https://doi.org/10.5281/zenodo.23744618, licensed CC BY 4.0.","citation":"Probative. (2026). Legal market crosswalks: practice areas, federal case codes, states, federal districts and counties (Version 1.1.0) [Data set]. Zenodo. https://doi.org/10.5281/zenodo.23744618","disclaimer":"Not legal advice. This is a reference table of public codes and boundaries, kept for research and marketing planning. Which court hears a case depends on more than a county line; check the statute and the court's own rules.","notice":"Probative is a marketing firm, not a law firm; not legal advice.","lastChecked":"2026-10-29","url":"https://probativegrowth.com/data/v1/crosswalks/changes.json","humanUrl":"https://probativegrowth.com/data/crosswalks/","statusCodes":{"P":"primary source","S":"secondary source","D":"ABA model default","U":"open question"}},"changes":[{"id":"crosswalks-2026-10-28-first","date":"2026-10-28","title":"Crosswalks first published","summary":"Practice areas, nature-of-suit codes, states, federal districts, counties and the datasets that measure each practice, with the keys every Probative dataset uses.","source":{"label":"28 U.S.C. ch. 5 (govinfo)","url":"https://www.govinfo.gov/content/pkg/USCODE-2024-title28/html/USCODE-2024-title28-partI-chap5.htm"},"dataset":"crosswalks"},{"id":"crosswalks-2026-10-28-territories","date":"2026-10-28","title":"Version 1.1.0: territories, former county codes and special keys","summary":"Puerto Rico's municipios and the county equivalents of Guam, the U.S. Virgin Islands, the Northern Mariana Islands, American Samoa and Midway join the county table, each with its federal district (where one exists) and its Census population; the U.S. Minor Outlying Islands become a jurisdiction. Former county codes retired since the 1970s (such as Alaska's Prince of Wales-Outer Ketchikan, 02201) join the former-code table, and every former code now names the current counties that took its area. Codes sources use for a place under another key (EEOC's WQ for Wake Island, U.S. Courts' NMI) and for things that are not places (military mail, the freely associated states, the VA's unplaced addresses) are documented as ALIAS and SPECIAL rows.","source":{"label":"Census Bureau, 2020 county code list","url":"https://www2.census.gov/geo/docs/reference/codes2020/national_county2020.txt"},"dataset":"crosswalks"}]}