MileCheckHighway mile marker data for all 50 US states
Every highway mile marker position we have in the United States, as CSV and GeoJSON files you run on your own systems. You pay one flat price a year, set by the size of your fleet. There are no API calls to count, and lookups work without a cell signal.
Counts are from the November 2, 2026 release.
What is in each row
One row is one mile marker. The route is the one a driver reads on the sign, like I-15 or US-89, not an internal agency code.
| Field | What it holds |
|---|---|
id | A stable row id. It survives coordinate corrections, so you can match rows from one month to the next. |
state, country | Two-letter state code, and US. |
route | The signed route, for example I-15, US-89 or SR-201. |
route_alt | Other signed routes on the same pavement at that marker. |
agency_route_id | The agency's own route name, where it differs. Oregon highway numbers, for example. |
marker, unit | The number on the marker, whole or one decimal, and mi. |
direction | NB, SB, EB or WB where the state places a marker on each side of the road. |
lat, lon | WGS84, six decimal places. |
county | When the state supplies it. |
position_type | Whether the point is a surveyed sign or placed along the state's route line at that mile. |
source, source_url, license | The agency layer the row came from and its stated terms. |
Three rows from the Utah file, some columns left out here:
id,state,country,route,route_alt,marker,unit,lat,lon,position_type UT-I_15-0-NB,UT,US,I-15,,0,mi,37.000019,-113.622456,physical UT-I_15-1-NB,UT,US,I-15,,1,mi,37.012987,-113.614383,physical UT-I_15-1-SB,UT,US,I-15,,1,mi,37.013145,-113.614777,physical
Coverage
- All 50 states, interstates, US routes and state routes where the state publishes markers.
- 24 states give surveyed sign positions. 19 are placed along the state's own route line at each mile. 7 use surveyed signs where they exist and the route line elsewhere. Every row says which.
- Each state's source agency and its stated terms are listed in the manifest and in LICENSE.txt.
- Kilometre markers for ten Canadian provinces and territories are available on request, in the same layout.
How you get it
- Delivered to your S3 bucket, or by a secure download link.
- One file per state and one national file, in CSV and GeoJSON.
- A full snapshot every month, with a change list naming the markers added, moved and removed since the last one.
- Corrections sent between snapshots when a state fixes its data.
- A manifest with row counts per state and SHA-256 checksums for every file.
Want live lookups instead of files? The MileCheck API turns a GPS position into the nearest mile marker, one call at a time.
Related questions: Is there a database of every highway mile marker in the US? · Is there an API that gives the mile marker for a GPS location? · How do dispatchers find the mile marker for a caller's location?
Prices
One flat price a year, set by the number of trucks on your platform. There is no per-truck charge.
| Tier | Trucks on your platform | Per year |
|---|---|---|
| 1 | Up to 200 | $5,000 |
| 2 | 201 to 1,000 | $8,000 |
| 3 | 1,001 to 2,500 | $11,000 |
| 4 | 2,501 to 5,000 | $14,000 |
| 5 | More than 5,000 | Quoted |
Every tier includes all 50 states, the monthly snapshot and change list, corrections between snapshots, and the right to show the mile markers to your own customers and drivers.
Billed yearly in advance. Your tier is checked once a year at renewal, from the truck count you report. There is no monthly reporting. Resale or redistribution of the data is not included. Prices are in US dollars, before tax.
Ask for a sample or a quote
The free sample is Washington and Oregon, 21,918 rows, in the same layout as the full set. A person at MileCheck reads every message and writes back.