Supporting information (online component) for

"A Century of Sprawl in the United States"

Barrington-Leigh and Millard-Ball

Proceedings of the National Academy of Sciences, June 2015

PNAS study and Supporting information

Maps of nodal degree for large metropolitan areas

Animations of the development of the street network in different metropolitan areas

Open data

Our time-series data are available publicly at The data are provided at four geographic levels:

  • U.S.A.
  • state
  • metropolitan region (CSA and CBSA), and
  • county

We also provide snapshots of the latest road network stock from the parcel-based and TIGER/Line data.

Available formats are Python pandas, tab-separated (.tsv) and shapefile.

We also provide network (graph) representations of the nodes in metropolitan areas of the USA in GML format.

Please refer to the two README files for full information (packaged with the data on DataDryad):


Barrington-Leigh, Christopher and Millard-Ball, Adam (2015), "A Century of Sprawl in the United States." Proceedings of the National Academy of Sciences. DOI: 10.1073/pnas.1504033112


For further questions, please contact:

  • Chris Barrington-Leigh, McGill University: .
  • Adam Millard-Ball, University of California, Santa Cruz:

Chris Barrington-Leigh and Adam Millard-Ball, 2015