| API | Description | Category | Mashups |
|---|---|---|---|
| Sunlight Labs Congress | US Congress database service | Government | 19 |
| US Postal Service | Package shipping and postage | Shipping | 14 |
| NOAA National Weather Service (NWS) | Weather forecast database | Weather | 13 |
| OpenSecrets | U.S. political data lookup | Government | 7 |
| GovTrack.us | US Congress database service | Government | 6 |
| Cicero | Address-based district matching and elected official lookup service | Government | 5 |
| Follow The Money | Database of US campaign contributions | Government | 4 |
| New York Times Congress | US Congress historical data | Government | 4 |
| MapLight | Government database linking contributions and votes | Government | 3 |
| New York Times Campaign Finance | U.S. campaign finance data | Government | 3 |
| PDXCouncilConnect | Portland (Oregon) City Council voting service | Government | 3 |
| Australian Business Number Lookup | Australian business number refernece service | Government | 2 |
| Capitol Words | Track words used by US government representatives | Government | 2 |
| NYC Open Data | New York City data collection | Government | 2 |
| StrikeIron Super Data Pack | APIs for variety of reference data sources | Reference | 2 |
| USGS Elevation Query Service | Determine elevation based on latitude and longitude | Mapping | 2 |
| ActBlue | Democratic fundraising service | Government | 1 |
| BART | Transit tracking service for San Francisco, California | Transportation | 1 |
| Business.gov | US government small business resources | Government | 1 |
| CitySourced | Mobile civic engagment tool | Government | 1 |
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