Yokosuka's 2026 population is now estimated at 389,568. In 1995, the population of Yokosuka was 432,193. Yokosuka has grown by 249 in the last year, which represents a 0.06% annual change. These population values and projections come from Japan city census series 1995 to 2005 via CityPopulation fallback access, Japan 2010 Census municipal population Table 1 (e-Stat official CSV), Japan 2015 Census municipal population Table 1 (e-Stat official CSV), Japan 2020 Census municipal population Table 1-3 (e-Stat official download) and World Population Review Internal Projections .