MileCheckWhere can I get mile marker data?
Three places. Each state DOT's GIS portal, one state at a time. The federal HPMS route files, which hold route lines with mileage but not sign positions. Or a single licensed file for all 50 states, such as the MileCheck milepost dataset.
State DOT GIS portals
Most states publish a milepost or reference post layer, often on ArcGIS. They are the source. Each state names its fields and routes its own way, and some publish only interstates. See does my state DOT publish mile marker data.
Federal HPMS files
The Federal Highway Administration's Highway Performance Monitoring System has route lines with begin and end mileage. You can place points at each mile along them. Some states measure those miles by county, so the numbers can restart at county lines and may not match the signs.
One file for all 50 states
As of its November 2, 2026 release, the MileCheck dataset has 396,842 marker positions on 9,056 signed routes, as CSV and GeoJSON, in one layout. Each release comes with a list of what changed. It is a yearly license, quoted by size and support. A Utah sample is a free download.
Mile marker data for all 50 states
396,842 marker positions as CSV and GeoJSON, one layout for every state, with a list of what changed in each release. Download the Utah sample with no form.
Questions, answered
Is mile marker data public?
Much of it is published by state agencies, each under its own terms. Read each source's terms before using it in a product.
Is there Canadian data?
Yes. Kilometre markers for ten provinces and territories are available on request in the same layout.