Fremont, CA launched its open data portal as part of the city's transparency intiative

City Governments Making Public Data Easier To Get: 90 Municipal Open Data Portals

In the past decade, dozens of American cities have established open data portals, making it easier for the public to obtain information about government activity.

Free Data Sources: Municipal Open Data Portals For 85 US Cities

Dozens of US cities now offer fairly comprehensive open data portals, with information on varied types of government activity, in a choice of formats to suit the diverse needs of casual readers, journalists and data analysis junkies.