Thaba-Tseka's 2026 population is now estimated at 26,396. In 1986, the population of Thaba-Tseka was 2,127. Thaba-Tseka has grown by 1,287 in the last year, which represents a 5.13% annual change. These population values and projections come from Lesotho city census rows via CityPopulation fallback access and World Population Review Internal Projections .