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.
GEOnet World Place Names Server - GEOnet is a database of World place names developed from the country gazetteers that were published by the US Defense Mapping Agency (now the National Imagery and Mapping Agency). It contains place names for over 3.3 million features throughout the World.
Alexandria Digital Library Gazeteer Server - This gazetteer contains place names for the entire World, including the United States. It is based on gazetteer information from a number of sources, including GEOnet and GNIS.
GeoNative - A site that deals with Minority and Native Language place names.
Getty Thesaurus of Geographic Names - The Getty Thesaurus of Geographic Names (TGN) provides information on place names related to art, art history and related subjects, such as history archeology, and geography.
Shtetl Seeker - Shtetl Seeker is a searchable database that provides information on the location of populated places in Eastern Europe, many of which no longer exist.
New South Wales - Place Name site from New South Wales Land and Property Information.
Northern Territory - Place Names in the Northern Territory from NT Lands Planning and Environment.
South Australia - Place Names Online South Australian State Gazetteer.
Victoria - Signpost, the Place Names in Victoria web site.
Western Australia - Names and places in Western Australia from the Department of Land Administration.
Place Names in Belgium - An alphabetical list of cities, towns and hamlets in Belgium. This site gives the postal code and province for cities, towns and villages in Belgium.
British Columbia Place Names - Search for place names in British Columbia. Provides location and topographic map sheet showing the place or feature. Also has an option to do "sounds like" searches. In some cases, the place may be displayed on a digital map.
Northwest Territories Place Names - Search for place names in the Northwest Territories. Provides location and topographic map sheet showing the place or feature. A map showing the feature's location can also be displayed.
Place Names in Denmark - This site contains alphabetical lists of authorized place names in Denmark. Each list contains information on place names the parish and the administrative district. In Danish.
Place Names Database of Estonia - Since it declared its independence in 1991, Estonia has renamed a number of places. This site is a searchable database that contains current names for places in Estonia as well as variant names.
Finland - The National Land Survey of Finland's MapSite. Registration required.
France
Communes Search - The searchable database of French parishes and townships from the Institut Géographique National.
Place Names Search - The searchable database of over 2,000,000 French place names from the Institut Géographique National.
Germany
Atlas des Deutschen Reichs / Atlas of the German Empire - Scanned images of the maps and gazetteer of this 1883 atlas by Ludwig Ravenstein are provided by the University of Wisconsin. It covers Germany as well as neiboring countries.
Landranger Map Place Names Search - This site allows users to search for place names appearing on the Landranger maps. For each place name searched, this system provides information on the Landranger map number that contains the place, the type of feature and its latitude and longitude.
Get a Map - The Ordnance Survey's Get a Map system.
Project Perseus Atlas - Locate and plot sites related to the Greek world and the Mediterranean region. The atlas has drawings, digital elevation models, satellite images and three-dimensional topographic views.
Scandinavia - The Nordic Place Names Database, hosted by the National Land Survey of Finland, contains place names for Denmark, Faeroe Islands, Finland, Greenland, Norway and Sweden. Registration required
Scotland - Two sites are available for Scotland. They are:
Gazetteer for Scotland - This site describes itself as a comprehensive geographical database of "towns, villages, bens and glens from the Scottish Borders to the Northern Isles."
Scottish Parishes - Scottish Place Names Society's list of parishes in Scotland.
Sweden - Two sites are available for Sweden. They are:
Swedish Place Names Lexicon - Place name list for Sweden. Each entry identifies the type of place, the parish, jurisdictional district and district. In Swedish.
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.