How do mile markers work on Delaware highways?

Delaware mileposts count up from the southern or western end of each route — on I-95 that means mile 0 at the Maryland line, rising to about mile 23 at the Pennsylvania line. Numbers are small because the state is small, so a single mile of difference matters more here.

How long is I-95 in Delaware?

Only about 23 miles — Delaware is the second-smallest state — but that short stretch carries the entire Northeast corridor through Wilmington, making it one of the busiest short interstate runs in the country.

Does MileCheck have live Delaware DOT alerts?

Yes. MileCheck shows live DelDOT road alerts — closures, incidents, and work zones — tied to route and mile marker, plus Delaware drawbridge locations. Mile markers cover every Delaware highway and work offline.

Highway Mile Markers in Delaware

Delaware is the second-smallest state, but its highways punch far above their size — the whole Northeast corridor squeezes through it. Here's how mile markers work in the First State, and how to see your exact one plus live DelDOT alerts in real time.

How Delaware numbers its highways

Delaware mileposts count up from the southern or western end of each route. On I-95, mile 0 sits at the Maryland line and the Pennsylvania line arrives around mile 23. Because the numbers are small, precision matters more here than almost anywhere — the difference between mile 5 and mile 6 near Wilmington can be the difference between two different interchanges. MileCheck shows your position down to a tenth of a mile, with every Delaware highway bundled to work offline.

The corridors people actually drive

I-95 crosses just about 23 miles of Delaware, but carries the entire East Coast through-traffic stream past Wilmington.
DE-1 is the state's own toll road, the main run south toward Dover and the beach towns.
US-13 is the old north–south spine down the length of the state.
I-295 and I-495 handle the Delaware Memorial Bridge approach and the Wilmington bypass.

Where mile markers matter most

Twenty-three miles of I-95 sounds easy until you're in it on a Friday: the toll plaza, the Wilmington curves, and the constant merge of I-295 and I-495 traffic make it one of the busiest short interstate stretches in the country. When something goes wrong there, or on the DE-1 beach run in summer, the location is given by mile marker — and small numbers mean there's no room to be a mile off.

I-95 crosses only about 23 miles of Delaware, from the Maryland line past Wilmington to the Pennsylvania line — all of it busy.

Beach traffic, storms, and drawbridges

Delaware's seasonal story is the beach run: DE-1 south to Rehoboth and the coast fills up every summer weekend, and coastal storms can flood low-lying shore routes. Delaware is also drawbridge country along its canals and inlets — a movable span opening for boat traffic can stop a beach-bound line cold. MileCheck maps Delaware's drawbridges so you know where the movable spans are before you reach one.

Live DelDOT alerts, in one place

MileCheck pulls live road alerts straight from DelDOT — closures, incidents, and work zones — tied to route and mile marker so you can see what's ahead before the Wilmington merge or the beach backup. Alerts are live statewide, and mile markers for every Delaware highway work even with no signal.

Everyday and emergency

Whether you're threading I-95 at rush hour, heading down DE-1 on a summer Saturday, or reporting a breakdown to roadside assistance, the mile marker is the fastest way to say exactly where you are. MileCheck shows yours in real time, down to a tenth of a mile — on your phone, and in the car via CarPlay and Android Auto.

Keep reading

Nearby state guides: Maryland · New Jersey · Pennsylvania

Delaware drawbridges: every movable bridge, its opening rules →

Essentials: What to tell 911 on the highway · How to find your mile marker · Browse the live mile marker map · All 50 states