According to Benin's 2013 census, the total population of Mono Department was 497,243, with 241,554 males and 255,689 females. The proportion of women was 51.40%. The total rural population was 50.30%, while the urban population was 49.70%. The proportion of women of childbearing age (15 to 49 years old) was 23.70%. The foreign population in the department was 8,975, representing 1.80% of the total population. The
labour force participation rate among foreigners aged 15–64 years was 39.70%. The proportion of women among the foreign population constituted 57.00%. The number of households in the department was 105,986 and the average household size was 4.7. The intercensal growth rate of population was 2.90%. Among women, the average age of first marriage was 21.6 and the average age at maternity was 28.6. The synthetic index of fertility of women was 4.8. The average number of families per house was 1.2 and the average number of persons per room was 1.8. The total labour force in the department was 142,220, of which 48.60% were women. The proportion of households with no level of education was 48.70% and the proportion of households with children attending school was 80.30%. The crude birth rate was 34.7, the general rate of fertility was 146.10 and the gross reproduction rate was 2.30. The main ethnolinguistic groups in the department are the
Aja,
Fon,
Gen,
Phla (also known as Xwla),
Saxwe,
Phera (also known as Xwela),
Kotafon and
Ayizo. Other groups include the
Aguna. ==Administrative divisions==