@Ryan Zweng @Jeff Jamieson @Sergey Tkachev , I actually just saw a video from Joe McCall about this very subject. So, I can't take credit for it.
Basically, you use listsource to find the most active zip codes for investors without ever buying the list. I believe you do need to create a listsource account, though.
--Sign in and choose a premade list by choosing Investor--> Absentee. This will give cash as well as financed sales made to absentee owners.
-- Choose your county and then if wanted property type (i.e. SFR, duplex, etc) and last sale price.
--Then specify last recording date of 6, 9 or 12 months (whatever seems appropriate). He recommended 6 months, but numbers were really low where I was looking, so I did 12 months.
--Likely should put "no preference" to the corporate owned selection so it includes LLC purchases
-- Click purchase list, but on the checkout screen, choose "partial list" and the you can sort custom by zip code. You can then export that table (zip code and number of sales) via email to yourself. (and you never have to purchase anything)
Now, you can use the table to determine which zip codes have the most activity.
Hope that helps.