65.19% of the population of West Manggarai Regency in 2024 will be aged 15-59 years.

The majority of the population in this region, or approximately 65.19%, are of working age (15-59 years), totaling 184,440. According to a 2024 publication by the Central Bureau of Statistics (BPS), the number reached 184,440. The remaining population consists of those aged 0-14 years (children), approximately 26.42%, and 8.39% are in the elderly group (over 60 years old).

The population of West Manggarai Regency was recorded at 282,940 as of 2024. This figure increased compared to 2023 and is higher than in December 2021. Compared to the previous five years, the region's Compound Annual Growth Rate (CAGR) is recorded as lower. The growth over the last five years was recorded at 0.59%.

Compared to other areas in East Nusa Tenggara Province, this regency/city ranks ninth in nominal terms. When grouped by island, it ranks 22nd.

The following is the population by age in West Manggarai Regency in June 2024, sourced from a publication by the Central Bureau of Statistics (BPS):

* Age 0-4 years: 19,550 (6.91%)
* Age 5-9 years: 27,870 (9.85%)
* Age 10-14 years: 27,340 (9.66%)
* Age 15-19 years: 24,220 (8.56%)
* Age 20-24 years: 31,720 (11.21%)

* Age 25-29 years: 27,460 (9.7%)
* Age 30-34 years: 21,390 (7.56%)
* Age 35-39 years: 19,720 (6.97%)
* Age 40-44 years: 18,190 (6.43%)
* Age 45-49 years: 15,370 (5.43%)
* Age 50-54 years: 13,840 (4.89%)
* Age 55-59 years: 12,530 (4.43%)
* Age 60-64 years: 8,960 (3.17%)
* Age 65-69 years: 5,900 (2.08%)
* Age 70-74 years: 4,070 (1.44%)
* Age 75 years and over: 4,820 (1.7%)