When Are Milepost Located?

United States. Except in California (discussed below), mileposts are placed on interstate highways (and other major routes in some states) at one-mile intervals that indicate the distance through a state.

What is a milepost on a highway?

These "mile markers" show the number of miles from where the Interstate route entered the state in which you are traveling. The counting always begins at the state line in the south (for north-south routes) and in the west (for east-west routes). So, mile marker numbers always get larger as you travel east or north.

How do I find my milepost?

Where to Find California Mileage Markers. These markers are found on state and county highways, but not on the Interstate or US roads. Look for them at the side of the road, sometimes at the end of a guard rail.