The National Transit Database (NTD) is the Federal Transit Administration’s primary national repository of public transit statistics. Social Explorer’s National Transit Database collection brings annual agency-level data from 2016 through 2024 into one place, making it easier to compare transit systems across the United States and track how individual agencies have changed over time.
In Social Explorer, the agency is the unit of analysis. Each transit agency is connected to contextual measures including its primary urbanized area population and fleet size, so users can look beyond raw totals and better understand how systems differ in scale, service, and operating conditions. Whether you are studying ridership recovery, operating efficiency, fleet modernization, or federal support, the NTD provides a practical foundation for transit research.
What the National Transit Database Covers
Social Explorer organizes the National Transit Database around four broad areas of transit performance and operations, with additional reliability measures that help complete the picture.
Service, Ridership, and Efficiency
Track how much service agencies provide and how riders use it with measures including unlinked passenger trips, passenger miles, vehicle revenue miles, vehicle revenue hours, and fare revenues. The collection also includes derived efficiency measures such as cost per passenger, passengers per hour, and fare recovery ratio.
These measures make it easier to compare transit performance across agencies or follow changes for a single system from year to year. With data spanning 2016 through 2024, researchers can also examine ridership and service patterns before, during, and after the COVID-19 pandemic.
Fleet and Infrastructure
Explore the size and composition of transit fleets across a wide range of vehicle types, including buses, articulated buses, heavy rail cars, light rail vehicles, commuter rail coaches, ferryboats, streetcars, aerial trams, and more. Vehicle age distributions support analysis of fleet modernization and replacement needs.
Infrastructure measures add another layer of context, including miles of track by mode and right-of-way type, along with maintenance facility counts by size and ownership. Together, these variables help users compare the physical assets that support transit service across different agencies and regions.
Operating Finances and Federal Funding
The National Transit Database collection includes total operating expenses broken out by major functions: vehicle operations, vehicle maintenance, facility maintenance, and general administration. This makes it possible to examine where agencies direct operating resources and how spending patterns differ across systems.
Federal funding data includes receipts from FTA formula programs, the Section 5309 capital program, the Section 5311 rural program, and other federal sources. These measures support research into how federal transit dollars flow to agencies and how funding relates to service levels, fleet investment, and the communities served.
Reliability and Mechanical Performance
Mechanical performance data includes counts of major and other mechanical failures alongside vehicle revenue miles operated. These measures can be used to calculate mean distance between failures, providing a useful way to assess fleet reliability and compare mechanical performance over time.
What You Can Do with National Transit Database Data
The National Transit Database supports a wide range of transportation and community analysis. Use it to benchmark agency efficiency, compare ridership and service trends, assess fleet age and modernization, examine operating costs, evaluate federal funding flows, or study the relationship between transit investment and the populations agencies serve.
Because Social Explorer brings annual NTD measures together in an integrated analysis environment, you can move from agency-level data to comparisons and trend analysis without having to assemble separate annual files yourself. That means less time preparing data and more time asking useful questions about transit performance.
Explore the National Transit Database in Social Explorer
Ready to work with National Transit Database data? Use Social Explorer to explore annual agency-level transit statistics from 2016 through 2024 alongside other community and transportation datasets. Compare agencies, track changes over time, and connect transit performance with the broader characteristics of the places agencies serve.
Start exploring the National Transit Database in Social Explorer and turn complex transit statistics into clear, practical insight by signing up for a free trial today.