You can learn more about these ticks at the CDC website.
The data from this map was compiled from the CDC government maps of geographic distribution of ticks that bite humans, (https://www.cdc.gov/ticks/geographic_distribution.html).
As stated on the CDC website:
“These maps show the general distribution of human-biting ticks in the contiguous United States. Populations of ticks may be found outside shaded areas. Naturally occurring populations of the ticks described below do not occur in Alaska; however, the brown dog tick occurs in Hawaii.
Note that adult ticks are the easiest to identify and male and female ticks of the same species may look different. Nymphal and larval ticks are very small and may be hard to identify.
This map has been designed to answer the question “What ticks should I be concerned about at a regional scale?” Please consult a local public health authority or USDA Agricultural Extension Office to determine more specific information at the state, county, or municipal level.”