You'll need to select one or two target markets like code enforcement, absentee, etc and hit them hard with multiple mailings.

Code requires 6'-8" typically (verify w/ local codes). 

I want to break that down by area code to be able to tell what areas investors are targeting.

Google search "poorest zip code in Ohio," and find out who is doing those mortgages.

Found this in the Arkansas Code:"If the tenant's holdover is a willful violation of the provisions of this chapter or the rental agreement, the landlord may also recover an amount not more than three (3) months periodic rent or twice the actual damages sustained by him or her, whichever is greater and reasonable attorney's fees."

I can do full zip codes that clearly break down numbers.

Remember these house/buildings where build long ago with a different set of housing codes that doesn't apply today which means you will have problems in the future.The foundation is what holds your house level., the earth/ground moves every so often in years.

I have a question regarding how in depth do i need to get with my market analysis for a particular zip code for flipping.  

There shouldn't be any insurance penalty for PEX, it is the current gold standard and code compliant. 

Account ClosedYou need ventilation and insulation into the crawl space per building code.