U.S. Census Bureau

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The Census Bureau's cartographic state boundaries, reaching us as TopoJSON through Mike Bostock's us-atlas. Neighbouring states share arcs in that format, which is how the game knows whose border touches whose.

A few rows

Chosen from the data, not taken off the top.

  • Tennessee

    8 land borders

    Tied with Missouri for the most neighbours.

  • Alaska

    No land borders

    Its only neighbour is Canada, which this map does not draw.

What we hold

Regions drawn
51
Bordering pairs
108
Last brought in
5 days agoAug 30, 2026

What we take

  • The outline of every state and the District of Columbia, and which of them border which
  • Nothing else: the capitals, populations and nicknames are compiled from Census figures and state tourism material

Terms

A work of the United States government, in the public domain, so no licence is named and none was granted — there was nothing to grant. The conversion to TopoJSON is us-atlas, under the ISC licence. Credited because a reader asking where a border came from deserves an answer, not because anyone can compel it.

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Mapped country

United States

50 states and the District of Columbia · Cartographic boundary TopoJSON from U.S. Census Bureau