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Open States' stated mission is to improve civic engagement.

To be true to that goal, we can not stand by and be silent when a large portion of Americans face systemic racism and other forms of oppression. That oppression has meant being excluded from civic participation at the ballot box, being called un-American for peaceful protests, and being denied justice for crimes committed against them.

Please consider giving to local causes that support racial justice in your area.


Open States Boundary Data

We provide files that serve as a static API for obtaining simplified GeoJSON describing the boundaries of legislative districts.

If you obtain an Open Civic Data Division ID (e.g. ocd-division/country:us/state:ks/sldl:1 you can convert it to a URL like

The URL consists of a few parts:

  • - base URL
  • 2018 - division issue year, currently only 2018 supported (divisions do not change most years)
  • ocd-division/country:us/state:ks/sldl:1 - Open Civic Data Division ID
  • json - end URL with `.json`

File Format

  • division_id - Open Civic Data Division ID, same as URL.
  • year - Issue year for Boundary, same as URL.
  • centroid - GeoJSON Point representing the centroid of this boundary.
  • extent - Coordinates for upper-left & lower-right extent of boundary.
  • shape - Simplified GeoJSON MultiPolygon for display purposes. This data has been simplified (losing some detail to gain speed when drawing/processing) and should be used for display but not intersection/point-in-polygon testing.
  • metadata - Metadata that was provided by issuer, typically a bit of Census data. No particular guarantee is made about what is here.

Obtaining ocd-division IDs

If you're using Open States data you'll see ocd-division IDs in a few places: