Direct mail -- how can I narrow this list?

[Will Porter]

I'm trying to put mailers together using a list from Listsource, and I settled on these criteria based on what @Michael Quarles has posted:

• Entire city
• Absentee owners
• At least 30% equity
• Minimum 4 years of ownership
• SFR
• 3 bedrooms
• Total assessed value $0 to $current median price

These criteria give me a list of 24,000 names on Listsource. With my budget, I need to be more in the range of 1,000 names. Any ideas for this?

Narrowing to certain zip codes come to mind, any other suggestions?

Thanks!