Jinny Carter (neé Martin) was the wife of the late Jim Carter.
In September 1783, she was amongst the tenants who greeted Ross Poldark when he came home.
A few months later, Jinny had become the girlfriend of Jim Carter and became pregnant. When Ross Poldark found out, he persuaded them to marry and gave them a cottage in Nampara. Jim was given a promotion so he could provide for her and the baby.
However, Jim had promised them he would stop poaching. Even though he agreed to stop, he still went. Jinny pleaded with Demelza Poldark to help, and Ross agreed to speak to him. Jinny had managed to get Jim to promise to stop poaching, and he said he would following one final expedition.
Unfortunately, Jim was arrested. Jinny went to Nampara House to tell Ross and Demelza. They were unable to persuade the judge to let Jim go. Jim later died.
Jinny gave birth to their child, Kate Carter, sometime later. Demelza Poldark later made her the scullery maid of Nampara.