The majority of the population of Mamberamo Raya Regency in 2023 is of working age.

In 2023, the majority of the population of Mamberamo Raya Regency was dominated by the productive age (15-59 years old), totaling 26,554 or 66.33% of the total population. Meanwhile, children (0-14 years old) and the elderly (over 60 years old) accounted for 30.16% and 3.51%, respectively.

The population of Mamberamo Raya Regency was recorded at 40,035 people as of 2023. This figure increased compared to 2021 and is higher than in December 2020. Compared to the previous five years, the Compound Annual Growth Rate (CAGR) of this region is recorded as higher. The growth over the last five years was recorded at 11.43%.

Compared to other districts/cities in Papua Province, the population of Mamberamo Raya Regency ranks seventh, while when grouped by island, this district/city ranks 13th.

The following is the population by age in Mamberamo Raya Regency in December 2023, sourced from the publication of the Central Bureau of Statistics (BPS):

* Age 0-4 years: 2.52 thousand people (6.29%)
* Age 5-9 years: 4.63 thousand people (11.57%)
* Age 10-14 years: 4.92 thousand people (12.3%)
* Age 15-19 years: 4.62 thousand people (11.54%)

* Age 20-24 years: 4.3 thousand people (10.75%)
* Age 25-29 years: 3.56 thousand people (8.9%)
* Age 30-34 years: 3.44 thousand people (8.59%)
* Age 35-39 years: 2.95 thousand people (7.37%)
* Age 40-44 years: 2.62 thousand people (6.53%)
* Age 45-49 years: 2.22 thousand people (5.55%)
* Age 50-54 years: 1.52 thousand people (3.79%)
* Age 55-59 years: 1.33 thousand people (3.32%)
* Age 60-64 years: 0.86 thousand people (2.15%)
* Age 65-69 years: 0.31 thousand people (0.78%)
* Age 70-74 years: 0.14 thousand people (0.35%)
* Age over 75 years: 0.09 thousand people (0.23%)