OpenHistoricalMap
(Redirected from Open Historical Map)

No community is too small, no story too obscure to add to this map.
Everyone has something to contribute, including you!
Contribute
To contribute to OpenHistoricalMap, go to the main map, zoom in to a place of interest, and click the “Edit” button. If you are familiar with editing OpenStreetMap, the OpenHistoricalMap editing experience is very similar. See the tagging guidelines for information on a few changes we’ve made to accommodate the time dimension.
We also maintain several software projects to facilitate map contributions and data reuse. Please report any issues and send us your ideas on GitHub or our forum.
Then and now
From OpenHistoricalMap's community projects:
Left: City limits of San Jose, California, as of March 1968. Right: The same location today.
On this day
Selected establishments and disestablishments on October 17:
- 1797
- Under the Treaty of Campo Formio, various Austrian territories were transferred to France, bringing an end to the Burgundian Circle.
- 1816
- The Gambia Colony and Protectorate is established as part of the British Empire.
- 1881
- In Rio de Janeiro, the Leopoldina Railway's Carangola Line opens between Itaperuna and Aré.
- 1887
- French Indochina is formed from Annam, Tonkin, Cochinchina, and Cambodia.
- 1918
- The Jōzankei Railway begins service in Sapporo, Japan.
- 1955
- In Colorado, Arapahoe County gains 1.8 acres (0.73 ha) after a court orders Denver to de-annex several streets.
- 1967
- The first section of the Northern Motorway opens in Christchurch, New Zealand.
- 1999
- Marechiaro station opens on the Albano–Nettuno line in Anzio, Italy.
Statistics
- 2.1M
dated elements - 514k
buildings - 381k
railroad miles - 123
average age - 1939
average year - 1,825
contributors
- Source: Overpass API, Overpass API, Planet
- October 8, 2025
News
- August 11, 2025
- Vespucci adds built-in support for editing OpenHistoricalMap.
- April 27, 2025
- OSM Building Viewer adds support for rendering an OHM building in 3D.
Events
- November 14, 2025 – November 15, 2025
- State of the Map Europe in Dundee, Scotland
- November 12, 2025 – November 13, 2025
- Unicode Technology Workshop in Mountain View, California
- October 16, 2025 – October 19, 2025
- WikiConference North America in New York City
- October 15, 2025 – October 18, 2025
- North American Cartographic Information Society Annual Meeting in Louisville, Kentucky
Policies and guidelines
Tagging
Copyright
Code of conduct
Good practice (draft)
Land acknowledgment (draft)
Resources
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OSMUS Slack#openhistoricalmap
Discord#openhistoricalmap
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