openinterstate

Structured US interstate data from OpenStreetMap

Directional corridors, normalized exits, linked places, and reference routes — derived from raw OSM and published as dated, checksummed releases.

I-10 I-11 I-12 I-15 I-16 I-17 I-19 I-2 I-20 I-22 I-24 I-25 I-26 I-27 I-29 I-30 I-35 I-35E I-35W I-37 I-39 I-4 I-40 I-41 I-43 I-44 I-45 I-49 I-5 I-55 I-57 I-59 I-64 I-65 I-66 I-68 I-69 I-69C I-69E I-70 I-71 I-72 I-73 I-74 I-75 I-76 I-77 I-78 I-79 I-8 I-80 I-81 I-82 I-83 I-84 I-85 I-86 I-87 I-88 I-89 I-90 I-91 I-93 I-94 I-95 I-96 I-99
647
corridors
96,366
exits
109,647
places
468,361
exit-place links
263
reference routes

Get the data

curl -LO \
  https://github.com/tldev/openinterstate/releases/download/release-2026-03-25-gha-14/openinterstate-release-2026-03-25-gha-14.tar.gz

Or browse releases for manifests, checksums, and lineage files.

Reachability scores are published separately: openinterstate-reachability score-20260326-6c28d57

What's in a release

CSV tables, GPX reference routes, and GeoJSON examples.

Table Description
corridors Contiguous directional interstate corridors
corridor_edges Graph edges assigned to corridors
corridor_exits Normalized exits linked to a corridor
exit_aliases Source exit aliases mapped to normalized exits
places Reachable places and services
exit_place_links Spatial proximity links between exits and places
reference_routes Routes for QA, examples, and exploration

Links