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Blacktown City CouncilPopulation forecast

Blacktown City Council

Population and age structure

Between 2021 and 2031, the age structure forecasts for Blacktown City Council indicate a 36.6% increase in population under working age, a 38.0% increase in population of retirement age, and a 33.2% increase in population of working age.

Knowledge of how the age structure of the population is changing is essential for planning age-based facilities and services, such as child care, recreation and aged care.

The forecast age groups of Blacktown City Council is a function of the current age of the population (people aging each year, being born and dying) as well as the age of people migrating into and out of the area. This in turn is driven by location (fringe, city centre, regional or rural) the existing housing stock (separate dwellings, medium or high density), the amount and type of new residential development (same as existing stock, or diversifying) and where the area is in a cycle of change. We call this the area’s residential role and function. You can learn more about this in the section household and suburb life cycles.

Forecast age structure - 5 year age groups
Blacktown City Council - Total persons202120312041Change between 2021 and 2041
Age group (years)Number%Number%Number%Number
0 to 430,6047.744,4638.348,1577.7+17,553
5 to 931,7277.942,7508.048,0327.7+16,305
10 to 1429,1517.337,7167.045,2467.2+16,094
15 to 1924,6366.234,5546.441,4406.6+16,803
20 to 2426,9836.833,7556.337,9746.1+10,991
25 to 2928,4557.136,6706.839,6956.3+11,240
30 to 3432,2138.144,5108.347,3157.6+15,101
35 to 3936,8619.249,1929.253,3868.5+16,525
40 to 4430,8187.743,8118.250,8448.1+20,026
45 to 4925,3936.436,6796.844,5187.1+19,125
50 to 5422,1275.529,3185.537,2426.0+15,115
55 to 5920,2025.124,3324.531,2705.0+11,068
60 to 6417,6674.420,5753.825,5044.1+7,837
65 to 6914,5403.617,6263.320,8383.3+6,298
70 to 7412,0513.014,8022.817,8572.9+5,806
75 to 797,4601.911,4612.114,9772.4+7,517
80 to 844,6451.28,5131.611,4711.8+6,826
85 and over4,1901.06,7691.39,4421.5+5,251
Total persons399,725100.0537,497100.0625,207100.0+225,482
Source: Population and household forecasts, 2021 to 2041, prepared by .id (informed decisions), October 2023.

Key findings

In 2021, the dominant age structure for persons in Blacktown City Council was ages 35 to 39, which accounted for 9.2% of the total persons.

The largest increase in persons between 2021 and 2031 is forecast to be in ages 0 to 4, which is expected to increase by 13,859 and account for 8.3% of the total persons.

The largest 5 year age group in 2031 is 35 to 39 years, with a total of 49,192 persons.

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