Geographic center finder

Geographic center versus center of population

The geographic center weights every square mile equally. The center of population weights every person equally. For the United States they are far apart. The Census Bureau's 2020 center of population is 37.415725° N, 92.346525° W, near Hartville, Missouri (594 residents). The center of the 50 states by area lies much farther north and west, because Alaska's large area pulls it.

This site computes a population center of its own from 2024 county estimates. The center of population guide gives that point for every state.

How to use it

1. Open the Country or US state list. The 50 states and DC come first, then countries.
2. Pick one. The tool loads the matching outline file.
3. The map flies to the center and drops a pin. The line under the list gives the name and the center's latitude and longitude.
4. Pick another entry to compare. If an outline is missing for a selection, the line says so.

How the center is computed

The tool uses d3-geo's spherical centroid. It treats the outline as a region on the sphere and finds the average position of its area, as if the shape were a thin plate of even thickness. Every polygon counts, including islands, weighted by its area.

Countries come from Natural Earth 1:50m outlines. US states come from Census outlines through us-atlas.

Why published centers differ

There is no single definition of a geographic center. Some surveys balance a cardboard cutout of a flat map, some use only the main landmass, some include coastal water. A U-shaped or crescent-shaped country can even have its centroid outside its borders. Expect the point here to differ from a monument or an atlas figure by a few to tens of miles.

Including islands moves some centers a lot. For a country with far-flung territories, compare the result with the mainland shape you have in mind.

Using the result

Copy the coordinates into the reverse geocoder to see the nearest town, or into the distance calculator to find how far a place is from its state's center.

Common questions

People ask for the center of a state to plan a meeting point, to settle a local claim about the "middle of the state", or to place a label on a map. For a meeting point that is fair to travelers, the center of population or the halfway point between home towns is often more useful than the area centroid.