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Chronicling America: A Guide for Researchers

Newspaper Datasets and API Access

Chronicling America provides access to information about historic newspapers and select digitized newspaper pages. To encourage a wide range of potential uses, we designed several different views of the data we provide, all of which are publicly visible. Each uses common Web protocols, and access is not restricted in any way. You do not need to apply for a special key to use them. Together they make up an extensive application programming interface (API) which you can use to explore all of our data in many ways.

All Digitized Titles

Downloadable lists of All Digitized Newspapers can be found on the top right corner of the All Digitized Titles page.

Files come in two formats:

  • Text file (.txt): Open with any text-based application.
  • Comma Separated Values file (.csv): Open with spreadsheet application.


As part of the National Digital Newspaper Program (NDNP), awardee institutions submit digitized content to the Library of Congress for inclusion in Chronicling America in the form of batches. This term describes the basic unit of data used to deliver digital assets (images and metadata) and can vary in size. A batch can consist of a single or multitude of newspaper titles and issues.

Note: The Datasets tab in the new interface of Chronicling America is still under development. Please visit the Chronicling America Website Migration page for more details. Until further notice, users can continue to access all batch data (except TIFFs) and bulk OCR from the legacy site. The current rate limit per IP address for the legacy site bulk OCR downloads is 10 bulk requests within 10 minutes. 


Computational access to Chronicling America is provided by the Library of Congress application programming interface (API). The APIs for site describes in detail how the Library makes information available via its JSON API, sitemaps, and suite of microservices. This API is accessible to the public with no API key or authentication required, however, rate limiting is strongly encouraged.


Additional Resources