San Clemente is a municipality in the landlocked province of Tarlac.
The municipality has a land area of 49.73 square kilometers or 19.20 square miles which constitutes 1.63% of Tarlac’s total area. Its population as determined by the 2020 Census was 13,181. This represented 0.88% of the total population of Tarlac province, or 0.11% of the overall population of the Central Luzon region. Based on these figures, the population density is computed at 265 inhabitants per square kilometer or 687 inhabitants per square mile.