The map of Macon builds on data from the City of Macon, Bibb County, the Macon Police Department, the Macon Water Authority, the Middle Georgia Regional Commission, and Macon-Bibb Planning and Zoning Commission. In addition to contributing data, governments can also get data back.
OpenStreetMap users have mapped historic sites, such as Congressional Cemetery in Washington, DC.
The USGS and National Park Service use OpenStreetMap data to build up their national maps.
The College Hill Alliance used housing citations to show changes in their neighborhood over the past 15 years. The code is open for anyone to see housing data for your neighborhood. See the city's data as a timeline-map and as a download for Google Earth.
When you edit OpenStreetMap you're making a better map for all of us.
How do companies catch up to Google and release their own maps? They use OpenStreetMap.
Craigslist is mapping your next apartment on OpenStreetMap.
Foursquare uses and edits OpenStreetMap to map places and check-ins worldwide
OpenStreetMap is even used to make blankets and "mapkins".