Congressional Districts - mattyschell/nyc-spatial-rolodex GitHub Wiki

United States Congressional Districts are the 435 single-member districts of the lower house of congress. The count of districts per state is assessed after the decennial census (2010, now 2020).

States are responsible for drawing districts within their state boundary. As a result congressional districts nest within states, never crossing state lines but otherwise can follow almost any visible or non-visible boundary.

The work of assessing population counts and apportioning those counts to states is described in the United States Constitution and is the responsibility of the United States Census Bureau.

United States Census Bureau

The U.S. Census Bureau's geographic database is called TIGER so you will find official congressional district boundaries available to download under pages like:

https://www.census.gov/geographies/mapping-files/time-series/geo/tiger-line-file.html

Though congressional districts are primarily created immediately after the decennial census, each meeting of the congress (ex "the 116th) also corresponds to a unique set of district boundaries. Usually the changes in the later part of a decade are for minor realignments of the underlying data (streets, rivers, etc).

New York City: Bytes of the Big Apple

The New York City Department of City Planning also releases clipped versions of Congressional Districts inside New York City. Take care that your expectations are met for districts that cross the city limits.

You will see both clipped to shoreline and water included downloads.

https://www1.nyc.gov/site/planning/data-maps/open-data/districts-download-metadata.page

New York City: NYC Open Data

NYC Open data republishes the Department of City Planning Bytes of the Big Apple data.