Geographic Names Information System (GNIS) - GNIS contains entries for almost 2,000,000 geographic features in the United States. Each entry includes information about Federally recognized names for features in the United States, including the State, county, and geographic coordinates. Produced by the US Board of Geographic Names and the US Geological Survey.
US Gazetteer - The US Gazetteer is a list of United States place names that were included in the 1990 census. Since it was derived from census data, this database only contains names for populated places.
National Association of Counties (NACo) - NACo provides a database of county information, searchable by city or state.
Switzerland - SwissGeo is a database that can be used to search for a place by name or address and view the 1:50,000 topographic map showing that place.