All data

The agency prepares inventories on a periodic basis under the federal Clean Air Act and the Massachusetts Global Warming Solutions Act.

Data extracts are raw data from company filings. Information Releases are annual reports from MassDEP.

Information and links for developers to work with real-time and static transportation data.

Search geographic datasets maintained by the Department of Transportation, such as road inventories, crash data, rail networks, and airports.

Spring 2023

February 2025

View data on member enrollment, application activity, Customer Service Center statistics, and more.

Find data on Title V Maternal and Child Health Performance Measures in Massachusetts.

Data feeds and files to develop applications for the MBTA and other transit services.

Explore public transit datasets, such as ridership data, service coverage, financials, and vehicle locations. This data is published by the Massachusetts Bay Transportation Authority.