Dot Density

I used approximately 1730 dots to illustrate the housing density in Florida counties. I placed the dots in the most likely areas of highest density using logic; close to the ocean and rivers and not in swamps or lakes. I also placed a higher density of dots where cities are located and areas of high growth i.e. The Villages of Lake, Sumter, and Marion counties. The legend is not as clear as I would like it, but there was not enough information given to notate the density. Is the area in square miles, acres or something else? I did not want to assume so therefore I tried to give as much information as I could by noting the formula for density. I learn a little more about Adobe with each lab...still frustrating, but would like to know more.