Parsing a tax delinquent list

[Jeremy England]

I downloaded a list of all tax delinquent property owners in my county from the tax assessors office.  It was over 21000 rows long.  Im looking for owners delinquent on their taxes with sfr valued between 70 and 180k.  

I deleted all rows with likely commercial properties (hwys, blvds, etc),

Which years are best to include? because there are some on the data set from the 1990's.  For my parse I deleted all rows except delinquents owed from 2016 and 2015.  

Then deleted all corporate owned properties with LLC, Corp, Inc etc text in the row

Then deleted all rows that owed less than 500 dollars and all rows that owed more than 5000.  Is that a good range?

Then deleted all assessed values under 50000 and all above 140000 (this would put likely market values between 70 and 180k)

Then deleted duplicates.

I was left with 843 addresses and owner names.  

Can anyone tell me if I should include some of the deleted parameters.  Or if i'm on the right track here.  new to direct mail marketing.