I just found a nice map of the zipcodes at the link here: http://maryland.hometownlocator.com/zip-codes/data,zipcode,21239.cfm

I would agree this will be tested again.

Personally, citing numbers to a buyer, your current economics is not the issue.You site the Purchase Price, assume an LTV and calc the loan payment for say 20yr, 4.125%.Calc the existing GSI, expenses (with new taxes, insurance) but sans the principle and interese, and derive the NOINow you've got the data for cash/cash and cap rate.These numbers should entice the buyer to be interested BECAUSE there's a cash flow and/or cap rate.

They sound to me like they're already testing you, yet I landlord in the type of place where people will more likely not be honest than they'll be honest, so call me jaded.

Great cash flow allows for many exit strategies.Remember, this is a business, not unlike poker, of making decisions with incomplete data. 

Couple of suggestions- Since you recently acquired the property with a tenant, she is "testing" your property management commitment.

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Where do I find this data?

In fact, according to US Census data that census tract is 87% homeowner/13% rental.

I’ve also used local Realtor sites, like LBAR.com (Lexington Bluegrass Associated Realtors) and Rector-Hayden Realtors and found that they don’t have data for my area either.