Two nonprofit research institutes, the Center for Neighborhood Technology and TransitCenter, designed an objective "transit score" to determine status of public transporation in cities across the US.
The institutes created a metric called the AllTransit Performance Score for subways, light rails, bike shares, and buses in US cities and towns. Using open data from 7,236 cities, researchers looked at factors like affordability, access to jobs, frequency of service, quality, and number of stops. The goal is to encourage policymakers to improve public transportation.
The researchers compiled an ultimate ranking of public transportation in all of these cities and towns. On the site, you can filter by zip code and population.