67.21% of Bontang City's population in 2023 was aged 15-59 years.

In 2023, the majority of Bontang City's population (127,670 or 67.21% of the total population) was in the productive age group (15-59 years). Children (0-14 years) and the elderly (over 60 years) comprised 26.77% and 6.02%, respectively.

Bontang City's population was recorded at 187,450 in 2023. Over the past 21 years, the population has steadily increased. The Compound Annual Growth Rate (CAGR) over the last five years was 1.48%, lower than the 1.82% recorded in the preceding five years.

Compared to other regions in East Kalimantan Province, Bontang City ranked eighth by nominal population; nationally (by island), it ranked 39th.

The following is the population distribution by age in Bontang City as of June 2023, sourced from the Central Bureau of Statistics (BPS) publication:

* Age 0-4 years: 15,490 (8.26%)
* Age 5-9 years: 17,520 (9.35%)
* Age 10-14 years: 17,840 (9.52%)
* Age 15-19 years: 17,130 (9.14%)
* Age 20-24 years: 17,630 (9.41%)
* Age 25-29 years: 16,290 (8.69%)
* Age 30-34 years: 15,760 (8.41%)
* Age 35-39 years: 14,960 (7.98%)
* Age 40-44 years: 14,070 (7.51%)
* Age 45-49 years: 11,830 (6.31%)
* Age 50-54 years: 10,940 (5.84%)
* Age 55-59 years: 9,040 (4.83%)
* Age 60-64 years: 5,940 (3.17%)
* Age 65-69 years: 3,160 (1.69%)
* Age 70-74 years: 1,420 (0.76%)
* Age 75 years and older: 920 (0.49%)