Land Investing - Marketing to Delinquent Taxes

[Gerald Harris]

When marketing to owners of Land who have delinquent taxes against their property how far would I go back?   

Should I focus on owners who have been delinquent 1 year and older?   2 years and older?   Or should i just market to all on the list when it comes to land.   

Many of these are small residential lots, some are commercial, there are some large lots/acreage as well.  

I recently secured a list my county here in Atlanta.   My list is current.