Annie returns to District 4 and gives birth to their son and keeps in touch with Katniss.
As far as who is left alive after the traumatic events of the franchise, Finnick’s wife Annie Cresta remains alive and pregnant with their child.
District 7 hothead, Johanna Mason also survives and presumably returns home along with other surviving rebels such as Beetee.
Plutarch Heavensbee is appointed as the Secretary of Communications and Effie and Haymitch thankfully remain alive as well and promise to keep in touch, with Haymitch returning to District 12 with Katniss and Peeta to raise geese.