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NYC Population FactFinder 2020

Population FactFinder allows you to easily define study areas — by selecting Census Tracts, Census Blocks, Neighborhood Tabulation Areas (NTAs), Community Districts, and more — to produce detailed population profiles.


You will need the following things properly installed on your computer.

(You can use NVM to manage node versions on your computer)

Local development

  • Clone this repo
  • Install Dependencies yarn
  • Start the server yarn run start
    • If running labs-factfinder-api and labs-layers-api locally, instead start the server with yarn run start:local-api
  • Run tests: yarn test


Primary views:

  • Selection - Allows the user to create a selection of geometries to view census/ACS data about.
  • Explorer - Shows census/ACS data tables and charts for the selected geometries.

Backend services

  • factfinder-api - An express api that handles search AND maps collections of selected geoids to an integer. Useful for persisting selections across browser sessions (also makes reports shareable)
  • layers-api - A collection of feature layers to populate the map with data.

Contact us

You can find us on Twitter at @NYCPlanningTech, or comment on issues and we'll follow up as soon as we can. If you'd like to send an email, use