The samrt thermoresponsive polymers have been the focus of major study among the researchers in the polymer science community because of their wide range of applications in sensing and devices as well as in biology and controlled drug delivery. The water-soluble lower critical solution temperature (LCST) polymers are most widely studied considering their use in biomedical and therapeutic sciences. But, polymers with upper critical solution temperature (UCST) behaviors are less studied, though conceptually they are equally useful. The UCST-type transition in polymers is usually driven by either hydrogen bonding (HB) or Coulomb interactions. Consequently, there has been major development in synthesizing new UCST polymers with HB interactive functional groups. But, the explorations of ionic UCST polymers that are rely on Coulomb interactions are very less. Thus, our research is focused on the development of new ionic electrostatically interacted UCST polymers. I will discuss several recent achievements of various ionic UCST-type polymers including their phase behaviors and responsiveness towards other stimuli in our laboratory. Specifically, the discussion focuses on the synthesis of amino acid-based poly(zwitterions) and poly(zwitterionic ionic liquid)s and discussion of their UCST-type behaviors due to intra- and inter-molecular electrostatic interactions between the pendent zwitterionic groups of the neighboring polymer chains. The synthesis of other ionic polymers such as phosphonium and imdazolium poly(ionic liquid)s (PILs), their copolymers and cationic polypeptides as well as their theromoresponsive behaviors due to the electrostatic ionic bridging interactions in the presence of added anion will also be discussed. The discussion will further foucs on the utilization of these PILs as thermosesitive stabilizers to promote waterborne multi-stimuli responsive dispersions of multi-walled carbon nanotubes (MWCNTs) and transition metal dichalcogenide (TMD) nanosheets.