I also didn't find shapefiles online. There is a map in this link though.
From: ctpp-news-bounces(a)chrispy.net [ctpp-news-bounces(a)chrispy.net] on behalf of Poole,
Sent: Friday, March 29, 2013 1:12 PM
Subject: [CTPP] metropolitan, micropolitan and combined statistical areas
In Feb, 2013 OMB released an updated list of metropolitan, micropolitan and combined
statistical areas. Does anyone know where I can find an updated shape file?
Voinovich School of Leadership and Public Affairs
Cindy J. Poole
Building 22, The Ridges
Athens OH 45701-2979