According to canon in the Carrion Crown adventure path, Ravengro was founded as a community at the same time as the building of Harrowstone Prison. Even with the adjustment of the dates surrounding Harrowstone, I still didn’t feel this was realistic, nor did it fit all the parts of the story as I am running it.
To that end, Ravengro as a community actually existed during the rule of the Whispering Tyrant. Its population at the time was under 60 people, who lived in almost-constant fear, but were kept from leaving by the Tyrants’ armies. Living constantly with death, its citizens secretly became devotees of Pharasma, which led to the creation of a meeting place beneath the village’s graveyard where they could worship without fear from the Tyrants’ forces.
After the Shining Crusade the village remained small, not blossoming into a larger community until the building of Harrowstone Prison (per adjusted dates). In the modern day, I’ve adjusted the town’s population upward by about 100 citizens.