Herm & Jethou's 2026 population is now estimated at 78. In 1981, the population of Herm & Jethou was 45. Herm & Jethou experienced a decrease of -2 residents over the past year, marking an annual decline of -2.5%. These population values and projections come from Guernsey parishes and islands populations via CityPopulation and World Population Review Internal Projections .