On the other hand it is a public resource that my taxes have paid for... it's not exactly a commercial image I'd be using.... 

Typically, if you can see the listing on a public facing site like Realtor.com, it's still an active listing however old.Also, most listing agreements include a protection period (typically 1-3 months) after the listing expires that prevent the seller from making a side deal and waiting out the listing agreement.Why do you not want to go through the listing agent?

In it, I take satisfaction in improving the housing for elderly public housing.    

My first direct mail attempt I did it myself by writing the letters and envelopes and then mixed up the to and from addresses (thanks public school system) and sent them all to myself.

In our city, the sign ordinance pertains only to signs placed on public rights-of-way and other people's properties (commercial or residential).  

"May" cover entrance to other units....they are in public view.

If you don't want to share this info publicly, you can pm, email or call me and I can give a quick idea of viability and approximate rate and terms.  

What is the best way to obtain "Public Notices - Such as Divorce Notifications, Estate Notices, Code Violation notices thru a County Government Office?

Now, those new owners can sell the real estate, if they choose.When probates are initially filed, that record is public information and you can get it and market to those people.  

However, if a sign on any public road presents a safety hazard, drivers should contact VDOT at 1-800-FOR-ROAD or via their online form.