If the data sources to which you subscribe identify respondents by market, you can generate a market-by-market report for your plans!
In the United States, you can get market details when you're using Nielsen's Mid-Minute Data. You can also get market details with the All-Minute Data if you also subscribe to the Mid-Minute Data.
The number of markets shown is dependent on sample size.
To create a Market-by-Market report, just select the plan column heading in the table view. Then choose "Market-by-Market" in either the Explore menu, or in the plan's popup menu.