Pembroke is a town in Washington County, Maine, United States. The population was 788 at the 2020 census. The town is home to a reversing falls on Mahar's Point. Called Pennamaquan by the Passamaquoddy Indians, the area was settled about 1774 as part of Dennysville. It was set off and incorporated on February 4, 1832, by the legislature, which n…Pembroke is a town in Washington County, Maine, United States. The population was 788 at the 2020 census. The town is home to a reversing falls on Mahar's Point. Called Pennamaquan by the Passamaquoddy Indians, the area was settled about 1774 as part of Dennysville. It was set off and incorporated on February 4, 1832, by the legislature, which named it after Pembroke in Wales, a community with a history of wooden shipbuilding stretching back to the Middle Ages. With one of the finest harbors in Maine, Pembroke too became a shipbuilding center. Vessels were constructed here as early as 1825. By 1859, when the population was 1,712, there were seven shipyards operating. Most schooners constructed here were used either by the coasting trade or fisheries.