Open Data
We map trails across the United States, and the summary figures behind that work are free to download and free to republish. Use them in an article, a research project, a class, or a map of your own — all we ask is a credit and a link.
Last rebuilt 2026-08-09
US trail coverage by state
Named trail counts, total mileage, activity split and mapped points of interest for every US state.
51 rows. Columns: named trails, total miles, hiking and mountain-biking counts, and mapped trailheads, campsites, waterfalls, boat launches and rapids — plus a link to the page for each place.
US trail coverage by county
Named trail counts, total mileage, activity split and mapped points of interest for every published US county.
2,121 rows. Columns: named trails, total miles, hiking and mountain-biking counts, and mapped trailheads, campsites, waterfalls, boat launches and rapids — plus a link to the page for each place.
Licence and attribution
These figures are counts and sums computed over OpenStreetMap data, so they carry OpenStreetMap’s licence: the Open Database License (ODbL) 1.0. You may copy, adapt and redistribute them, including commercially, provided you credit the source and keep any redistributed database under the same licence.
Please credit as: Trailmonger, derived from OpenStreetMap contributors (ODbL), with a link to trailmonger.com/data.
The licence text is repeated in the header of every CSV and as fields in every JSON file, so it travels with the data rather than living only on this page.
What is and is not here
These are aggregate figures. We do not publish the underlying trail geometry here — it comes from OpenStreetMap, and anyone who wants it should take it from the source, which is more current than any copy we could host.
We also do not redistribute our property-parcel or hunting-unit layers. Those are assembled from state and county sources whose terms permit us to use them in the app but not to hand them on — several are restricted by statute. Being able to reach data is not the same as being allowed to republish it, and we would rather say so plainly than quietly leave it out.
Corrections and requests
If a figure looks wrong, it is usually because the underlying map is wrong — the fastest fix is to correct it in OpenStreetMap, and it will flow through on our next rebuild. For anything else, or if you need a cut of this data we do not publish, email admin@trailmonger.com.
Full source credits for everything in the app are on our data credits page.