A heatmap of 1,771,955 elements modified in March, zoomed in on Slovenia, which resembles a population density map due to all the addresses added.
This is one of the largest increases in recent coverage we’ve ever seen, driven by an import of #GURS addresses in #Slovenia.
In March, the #OpenHistoricalMap community added 643,241 dated elements, 18,358 buildings, and 5,816½ railroad miles. The average age of a dated element fell by 24 years, and the average year shifted 17 years later. All this with the help of 28 new contributors – welcome!
osm.wiki/OHM/Statistics
Events. April 10, 2026: Graz Linux Days 2026 in Graz, Austria. April 30, 2026 – May 3, 2026: FOSSGIS OSM Community Meetup 2026 Number 25 in Essen, Germany. June 11, 2026 – June 13, 2026: State of the Map U.S. in Madison, Wisconsin. June 16, 2026 – June 19, 2026: 14th Symposium on Mexican Geography Instruction in Morelia, Michoacán, Mexico.
A table ranking countries by the number of events. United States leads with 23 events, trailed by Germany with two. Austria, Belize, Colombia, the United Kingdom, Mexico, the Netherlands, Panama, and the Philippines each have had one.
Community members are scheduled to present at events in at least four countries in the next few months. Our event calendar has never looked so international! 🇦🇹🇩🇪🇺🇸🇲🇽
osm.wiki/OHM/Events
Planning to name-drop #OpenHistoricalMap in a talk, organize a mapathon, or livestream your mapping? Let us know!
Why join OSM US? Our members say it best:
"I regularly use maps to lay out historic routes and in the US. Because #OpenStreetMap is a communal effort, I want to lend my support for its mission."
Help support this communal effort. Become a member of OSM US today 🔗 openstreetmap.us/get-involved...
If you only use the source for the opening date, it should be acceptable, because a fact cannot be copyrighted.
Thank you to all the donors who have supported #OpenHistoricalMap's fundraiser. We are more than 50% away from the timely goal of $2,026.
Donate: openstreetmap.app.neoncrm.com/forms/ohm-2026
Help us get there! Your investment will go directly toward enhancing #OHM's dependability and usability.
And we should have worded it better - your project is AMAZING. Looking forward to the updates. : ) Please share your progress with others on our Forum - forum.openhistoricalmap.org. THANK YOU for all you're doing. 🙏🗺️⌛
Wait... isn't that what OHM is supposed to be? :) I hope you're planning to store your data in OHM!
Oops! OHM was supposed to be a map of history, but linguists turned us into an accidental map of the history of writing. Minh introduces @unicode.org to our efforts with @maplibre.org to bring #HGIS to more language traditions all over the world:
youtu.be/xoqwUHvYsrs
w.wiki/JC25
#UTW2025 #i18n
In February, the #OpenHistoricalMap community added 47,171 dated elements, 5,175 buildings, and 7,924¾ railroad miles. The average age of a dated element fell by 10 months, and the average year shifted 5 months later. All this with the help of 43 new contributors – welcome!
osm.wiki/OHM/Statistics
New RVA bot! You've heard me drone on about @maprva.org's Yesterdays project, and now you get it spoon-fed to you every few hours. Give it a follow or, even better, go to yesterdays.maprva.org and place some photos yourself!
Or if you’re a mapper in or of somewhere else, stay tuned for additional online get-togethers at a more convenient time for your time zone.
Mappers in or of North America, join us on March 4 for a #MappyHour hosted by @osmus.bsky.social! RSVP today:
openstreetmap.us/events/mappy...
A proof of concept for OpenHistoricalMap Americana simulates a road atlas at any point in the history of highway construction. Tour down #Route66 and the other highways that existed at the time.
openstreetmap.us/events/mappi...
forum.openhistoricalmap.org/t/openhistor...
#MappingUSA #roadgeek
Help us make 2026 an historic year by participating in our first-ever donation drive! Your generous donation will go directly toward making #OpenHistoricalMap usability and reliability improvements. Find out more on the forum:
forum.openhistoricalmap.org/t/donate-for...
#fundraiser #donate
All OpenHistoricalMap websites and APIs will be down for approximately 30 minutes this Thursday from 15:00 UTC for a planned server configuration change to improve site reliability. We apologize for the inconvenience.
Thanks for joining us for #MappingUSA last weekend! Good news: videos are up: www.youtube.com/playlist?lis...
#OpenStreetMap #MappingUSA #opendata #mapping #GIS #geospatial
A line chart of dates along the X axis from May 2025 to present and average age in years along the Y axis from 110 to 140 years. The series seesaws between 125 and 135 except for a drop toward the latter half of last year to 120 before rebounding to 127 this month.
A line chart of dates along the X axis from May 2025 to present and average year along the Y axis from 1920 to 1950. The series mostly stays within the 1930s, steadily rising to the early 1940s in 2025 before a steep drop back to 1938 this month.
This is the single largest increase in the average age of an element and the single largest decline in the average year since recordkeeping began in June 2023. That’s actually a good thing: it means we’re mitigating #recentism, bringing more historical balance to our coverage.
In January, the #OpenHistoricalMap community added 65,731 dated elements, 9,668 buildings, and 15,303½ railroad miles. The average dated element got over 7 years older, and the average year is now over 4 years earlier. All this with the help of 39 new contributors – welcome!
osm.wiki/OHM/Statistics
Nice workshop on georeferencing coming up Jan 31 w/ @oldinsurancemaps.net @openhistoricalmap.org & more as a part of the @osmus.bsky.social virtual conference - openstreetmap.us/events/mappi...
Tune in Jan 31 at 2pm EST to georeference maps with @oldinsurancemaps.net, historic photographs with @maprva.org , and then translate those to @openhistoricalmap.org!
📣 Calling newcomers and #OSM experts alike: the #SOTMUS2026 call for proposals is open! OSM is powered by diverse projects and innovations from people like you! We welcome proposals about anything OSM, open data, or open source.
Learn more: lnkd.in/e7aPWe6P
Submit your ideas by Feb. 16th!
Image with text at the top that reads: "Wayback Machine Then and "WIKIPEDIA.ORG" at the bottom. Below is a Wayback Machine capture of the Cartoon Network website from JUN 8, 2003.
Wikipedia turns 25 today! 🎂📚
To celebrate, we’re looking back at its baby pictures—some of the earliest captures of the site, preserved in the #WaybackMachine.
Take a nostalgic peek at early Wikipedia ⤵️
web.archive.org/web/20030301...
#WikipediaDay #Wikipedia25 @wikipedia.org
This summer, investigations unearthed evidence that a hillfort in Dumfries & Galloway may have been besieged by an invading Roman force 1,900 years ago ⚔️
Experts say the new data from Burnswark Hill "challenges long-held assumptions about Scotland’s past": www.digitscotland.com/five-of-scot...
In December, the #OpenHistoricalMap community added 55,351 dated elements, 13,877 buildings, and 8,959 railroad miles. The average age of a dated element fell by 8 months, and the average year shifted one year later. All this with the help of 31 new contributors – welcome!
osm.wiki/OHM/Statistics
We deeply appreciate all the help that #GreenInfo provided over the years. We look forward to spending an unprecedented 2026 with the #HistoricalMapping and @osmus.bsky.social communities!
A raw view of the data showing route_lines features with indexed tram route attributes.
A raw data view of the world highlighting country territories as polygons, showing details about Numidia and France.
The main #VectorTiles tileset contains route information for more informative transportation map styles. A new tileset contains territories as polygons, so your custom map can color in a country or other administrative region.
Babylonia as 𒆳𒆍𒀭𒊏𒆠 Ur as 𒌷𒀕 Uruk as 𒋀𒀕𒆠
The map can label #toponyms in #MinorityLanguages #IndigenousLanguages #AncientLanguages, like no other world atlas you’ve ever flipped through.
Hi Example, In order to complete your request, OpenHistoricalMap needs permission to access information about you, including your email address, on all projects of this site. No changes will be made with your account.
If you contribute to @wikipedia.org @wikidatacommunity.bsky.social #WikimediaCommons #Wikivoyage, you can join OpenHistoricalMap in just a few clicks, without having to juggle yet another password for yet another wiki. It works a lot like our existing OpenStreetMap login support.
OSMCha showing a changeset that adds many streets to Mannheim.
OSMCha showing a changeset that adds boundaries around the world to the French Empire.
#OSMCha can visualize giant changesets without timing out or throwing an error. No one will sneak another empire into OHM without the community noticing it.
