Thanks for responding. I had an idea for another search, and finally found my answer:
A PID IS A “PROPERTY IMPROVEMENT DISTRICT”.
PIDs and MUDs are used by developers to raise funds for the needed development of these communities including the utilities/amenities and they pass on this cost to the final homeowners in the form of additional taxes that are paid over 20-40 years
PID is part of some locations, as in the top left of this screenshot. Prestonwood is my neighborhood in far North Dallas TX. 