The county is ginormous - I'll assume you want to invest in more populated areas rather than rural ones.In the lower income neighborhoods, you're looking at $350k on the low end for a rent ready duplex (either with tenants or after your rehab costs).  

Here's another article about rents.http://www.sltrib.com/news/3112372-155/too-many-sa...prices for both purchases and rents are going up faster than incomes. population is driving it up, but more and more people are being priced out!

I would LOVE to be able to quit the day job, but my reality is that I live in a town of about 3,000 and I make more that 80% of the population. 

I'm in Jacksonville,Fl and I operate in the capacity of a wholesaler/investor.I'm gonna apologize in advance for being bias but Jacksonville is a awesome market hands down we have several military installations and fortune 500 companies headquarters, here CSX corp and Fidelity National Financial just to name a few so of course population growth always follow which makes for a strong rental market and great cash flowing properties throughout Jacksonville especially in these area's  the Westside,Southside and in Arlington.I'd be more than happy to discuss further.

Population decline, crime rate and length of time you've owned the properties will be a factor in determining loan to value, rate and term offered.

In Excel (you can probably use google but I prefer the real thing) you simply use the IRR function like this: =IRR(range) where range is your excel cells used for calculation.In order to populate that range you simply put in your cash flow per year held.

This is one of the reasons so much miscommunication happens in the world today.In my version, there are 4 main personality languages. 1)Emotional action taker (35% of population)2)Relationship builder (35% of population)3)Data gatherer (15% of population)4) Competitor (15% of population)Each one has their positives and negatives, their own quirks and their own language.You could literally say, "good morning," to them and each personality would hear something different.

The day-time population is obviously highly educated highly paid folks with the Marine base or contractors that support the Base but the demographics of the people who actually live in Quantico is a little more spotty. 

New industry may be going in close by, the zip codes in these areas are experiencing the best population growth, the highest education and income levels, and the lowest crime levels.

You also get to set the tone for the tenant population you'd like to attract.