OpenHistoricalMap

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OpenHistoricalMap goes beyond the present, mapping places throughout the world… throughout the ages.
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
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