As written, that question does not appear to be about politics or policy as defined in our Help pageHelp page. While it's almost definitely true that the incarceration rate in local and county jails is driven by policy, your question doesn't connect to any aspect of public policy - it's just a request for a number.
If your question is motivated by something you read about a public policy, then just giving us that context could make it on-topic. For example, if the question were framed as :
Minister X is proposing policy Y because the incarceration rate in federal prisons is Z%. However, opponents are saying it will unfairly burden local and county jails. What is the incarceration rate in these facilities?
Now we aren't just providing a context-less number, we are answering a question about public policy, which is on-topic.
As written, I don't believe there is any stack where it would be on-topic.