Copyright and License

How to credit OpenHistoricalMap

We do not require any OHM-specific credit separate from those required by the underlying data. Citations, however, are appreciated as "OpenHistoricalMap contributors"

For a browsable electronic map, OHM prefers the optional credits appear in the lower-right corner of the map. For example:

Example of how to attribute OpenHistoricalMap on a webpage

Finding out more

Read more about using our data, and how to credit us, at the OHM Licence page.

Our contributors

Our contributors are many, many individuals and organizations. We would not exist without their efforts.

For further details of these, and other sources that have been used to help improve OpenHistoricalMap, please see the Contributors page on the OpenHistoricalMap Wiki.

Inclusion of data in OpenHistoricalMap does not imply that the original data provider endorses OpenHistoricalMap, provides any warranty, or accepts any liability.

Copyright infringement

OHM contributors are reminded never to add data from any copyrighted sources (e.g. Google Maps or printed maps) without explicit permission from the copyright holders.


If you have questions about your use of the OpenHistoricalMap name, please see our Trademark Policy.