OpenHistoricalMap is about historical data. Things that used to be there. From a variety of sources, contributed by mappers and historians across the world.

OpenHistoricalMap's community is diverse, passionate, and growing every day. Our contributors include enthusiast mappers, academics, digital historians, historical societies, and many more. To learn more about the community, see the user diaries etc

OpenHistoricalMap is open data: you are free to use it for any purpose under the terms of the data you are using. OpenHistoricalMap identifies license and citation requirements at the object level (if any). Credit or citation to OpenHistoricalMap for consolidating this data is appreciated, but not required. If you alter or build upon the data in certain ways, you may distribute the result only under the same licence. See the Copyright and License page for details.

You can access OHM data through various services, beyond just this website. See a list of available production and staging websites and APIs on our Wiki page.

This site and many other related services are formally operated by the very informal OpenHistoricalMap collective on behalf of the community. Use of all OHM operated services is subject to our Terms of Use, Acceptable Use Policies and our Privacy Policy.

Please contact the OHM team at ohm-admins@googlegroups.com if you have licensing, copyright or other legal questions.

GreenInfo Network is a nonprofit social-good mapping and communications organization that helps nonprofits and government agencies achieve social, environmental, and other goals using a range of tools, including human-centered design practices, collaborative development, and open source web and geospatial tools.

Development Seed is an engineering and product company that is accelerating the application of earth data to our biggest global challenges. Development Seed leverages massive earth data, cloud computing, geospatial AI, and thoughtful product development.