Southwest Michigan Planning Commission (SWMPC)

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Southwest Michigan Planning Commission is responsible for the Twin Cities Area Transportation Study (TwinCATS) and the Niles-Buchanan-Cass Area Transportation Study (NATS).

376 W. Main Street, Suite 130
Benton Harbor, MI 49022-3651

Voice: 269.925.1137

Fax: 269.925.0288

Contact: Kim Gallager



The Twin Cities Area Transportation Study (TwinCATS) is Benton Harbor-St. Joseph urbanized area, as designated by the United States Census.  The Twin Cities Area Transportation Study encompasses 12 jurisdictions located in Berrien County, these municipalites are:

  • City of Benton Harbor 
  • City of St. Joseph
  • City of Bridgman
  • Village of Shoreham
  • Village of Stevensville
  • Benton Township
  • Lake Township
  • Lincoln Township
  • Royalton Township
  • Sodus Township
  • St. Joseph Township
  • Grand Beach (satellite)
  • Michiana (satellite)


The Niles-Buchanan-Cass Area Transportation Study (NATS) is the Michigan piece of the South Bend, Indiana, urbanized area as designated by the United States Census.  The Niles-Buchanan-Cass Area Transportation Study encompasses 9 jurisdictions in Berrien and Cass Counties, these municipalites are:

  • City of Niles
  • City of Buchanan
  • Village of Edwardsburg
  • Bertrand Township
  • Buchanan Township
  • Howard Township
  • Milton Township
  • Niles Township
  • Ontwa Township