[JonathonW]

Here are the nationwide statistics for Lyme disease in the US: http://www.cdc.gov/lyme/stats/index.html

And some links to the CDC sites about other tick-borne diseases prevalent in the US: http://www.cdc.gov/ticks/diseases/ (most of these also include statistics on incidence and geographic distribution)

[Tiksi]

I was curious to see the rate of spread so I made this gif from the images in your first link:

http://paste.click/DyTMLM