How do I restrict the geography for the dataset output to particular counties instead of whole USA?

I created a crosstab for occupational data by educational attainment but have not been able to get the data to restrict to particular geographies I want to study.

Unfortunately, the IPUMS extract system does not currently have the capability to restrict output by county, as county codes are not unique across states. Instead, I suggest using the Select Cases functionality on the STATEFIP variable to limit your extract by state. You can then analyze the data by county within your stats package.