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Does anyone know of any good sources for US data (counties, congressional districts, etc) in GeoJSON format? Has anyone converted public-domain shapefiles/sources to GeoJSON that they would be willing to share?


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If you acquire the datasets there's always the possibility to converted them yourself through ogr2ogr utility in the GDAL library or with QGIS (which uses the GDAL library). –  Pedro Mendes Dec 29 '11 at 11:43
@PedroMendes Thanks for the suggestion. That is why I've been doing. I was just curious if there was a more comprehensive source for US data. –  Casey Dec 29 '11 at 16:30

4 Answers 4

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I found something closer to what I was looking for (US State and County boundaries) on github: https://github.com/johan/world.geo.json/tree/master/countries/USA

The features are very generalized/simplified, but they'll work for a national scale map. Country boundaries for the whole world are available in this repo too.

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You might take a look at SimpleGeo’s CC0 Places data set, and this related question: Converting SimpleGeo Places GeoJSON file to shapefile?

or just searching the geojson tag may turn up some results for you.

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January 12th, 2012: After SimpleGeo was acquired by Urban Airship in Oct 2011, Urban Aiship said “wind down the availability of the current versions of [SimpleGeo's] Places, Context, and Storage over the next few months.”...The target date for pulling the plug officially will be March 31, 2012. Link –  RyanDalton Feb 7 '13 at 18:43

Try using Freebase API. For example the following article


Available in JSON:


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After trying to find similar GeoJSON versions of US State and County boundaries, I finally decided to roll my own from the United States Census Cartographic Boundary Files, converting them to GeoJSON and KML formats using the MyGeoData vector converter.

I've made the results of this conversion available at: http://eric.clst.org/Stuff/USGeoJSON. Feel free to use these if they will help.

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Was using these, gratefully, but just noticed that California districts are not accurate for 113th Congress. For instance, in eric.clst.org/wupl/Stuff/gz_2010_us_500_11_20m.json look in the northern part of the state. Not sure of accuracy other states. –  Marjorie Roswell Nov 18 '13 at 18:07
@MarjorieRoswell, can you tell whether the source data was the issue, or is there a problem with only the JSON? –  EFC Nov 19 '13 at 15:10
I just downloaded, unzipped, and checked gz_2010_us_050_00_20m.zip: It's using the older districts, too. Here's what CA should look like for the current congress: nationalatlas.gov/printable/printableViewer.htm?imgF=images/… –  Marjorie Roswell Nov 19 '13 at 17:29
Thanks for pointing this out, Marjorie. I'm not surprised that redistricting is not fully reflected in these 2010 files. But it is good to be alert about this lag. –  EFC Nov 20 '13 at 18:31
Use TIGER2013 to get the congressional districts (and state legislative districts) as they were redrawn after the 2010 census. www2.census.gov/geo/tiger/TIGER2013 –  Joe Germuska Jul 15 '14 at 14:16

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