Diddillibah (Qld)

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Analysis of ABS population updates for the wider region, alongside newly validated addresses recorded by Districts since the Census, indicates the population of the suburb of Diddillibah stands at approximately 1,777 as of May 2026. This represents a growth of 74 people (4.3%) from the 2021 Census, which documented a population of 1,703 residents. The shift is calculated from the estimated resident population of 1,777, determined by Districts through evaluating the ABS's latest June 2025 ERP data release combined with an additional 5 validated new addresses since the Census date. This population size corresponds to a density of 159 persons per square kilometer, indicating a low density with space for expansion. Over the last ten years, the suburb of Diddillibah has shown steady growth with a compound annual rate of 2.1%, exceeding the Rest of Qld. Regional growth was mainly driven by interstate arrivals, which accounted for approximately 50.0% of the total population increase during recent times, though natural growth and overseas arrivals were also positive contributors.

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Data from Districts covering statistical areas shows that the suburb of Diddillibah possesses a qualified workforce with a strong presence in essential services, alongside an unemployment rate of 5.1%. By March 2026821 local residents were employed. The unemployment rate is 1.2% higher than the rate of 3.9% recorded in Regional Qld, and the workforce participation rate of 59.1% is notably lower than the regional figure of 64.3%. Census details show a moderate 17.2% of workers worked from home, though this may have been influenced by COVID-19 restriction measures.

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According to the latest postcode ATO data released for financial year 2023, taxpayers in the suburb of Diddillibah earn a median income of $46,947, with an average of $58,906. These figures are lower than the national benchmarks and compare to a median of $53,146 and average of $66,593 in Regional Qld. Adjusted for a Wage Price Index growth of 11.36% since financial year 2023, March 2026 estimates suggest a median income of approximately $52,280 and an average of $65,598. Census records indicate that household, family, and individual incomes are modest, falling within the 25th to 30th percentiles. Income brackets show that 23.6% of the population (419 individuals) earn between $1,500 - 2,999, which is comparable to the wider region where this segment comprises 31.7%. The local economy features diverse financial groups, with of residents facing tight financial conditions and receiving high weekly incomes. Households face significant mortgage and rent pressures, leaving just of income remaining, placing the area in the th percentile and the th decile of the SEIFA income index.

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Census data reveals that the housing stock in the suburb of Diddillibah is composed of 93.8% houses and 6.3% other dwelling types such as apartments and semi-detached options, compared to Regional Qld where houses make up 76.4% and other formats make up 23.6%. Homeownership rates are high at 50.8%, with mortgaged properties accounting for 35.6% and rental properties making up 13.6%. The median monthly mortgage payment was $2,200, which is higher than the Regional Qld average of $1,655, while the median weekly rent was $330, compared to $345 regionally. On a national level, mortgage repayments in the suburb of Diddillibah are higher than the Australian average of $1,863, whereas rental costs are below the national median of $375.

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Families make up 70.7% of all households, consisting of couples with children at 34.8%, couples without children at 27.7%, and single-parent homes at 8.1%. Non-family households represent the remaining 29.3%, with single-person households at 27.5% and group homes at 2.0%. The median household occupancy is 2.6 people, which is slightly above the Regional Qld average of 2.5.

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The proportion of residents with tertiary qualifications in the suburb of Diddillibah is below regional benchmarks, with 21.7% of residents aged 15+ holding a university degree compared to the national average of 30.4%. This highlights opportunities for local educational growth. Bachelor degrees are the most common at 15.0%, postgraduate degrees represent 4.7%, and graduate diplomas account for 2.0%. Vocational training is common, with 39.9% of the population aged 15+ holding vocational qualifications, including advanced diplomas at 12.2% and certificates at 27.7%.

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Public transport services in the suburb of Diddillibah include 2 active stops that offer bus services. These stops are served by 1 routes, which provide a total of 108 passenger trips each week. Transport connectivity is low, with residents living an average of 1787 meters from the nearest stop. The area is mostly residential, meaning most workers travel outside the suburb for work, and private vehicles are the primary travel method at 95%. Households own an average of 1.7 vehicles, which is higher than the regional average. Additionally, 17.2% of residents work from home, based on 2021 Census data which may reflect COVID-19 restrictions.

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Health profiles for the suburb of Diddillibah suggest below-average trends based on Districts assessments of mortality and chronic diseases. While typical health issues among the general public are standard, they are higher than the national average among older age brackets. The proportion of residents with private health insurance is relatively low at approximately 51% of the population, which equals about 898 people, compared to the national average of 55.7%.

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The suburb of Diddillibah has a lower level of cultural diversity than average, with 80.3% of the population born in Australia, 88.4% holding citizenship, and 94.8% speaking only English at home. Christianity is the dominant religion, representing 48.8% of the community. The most notable difference is in the Other category, which accounts for 0.7% of the population, compared to 0.8% in Regional Qld.

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The median age in the suburb of Diddillibah is 45, which is older than the Regional Qld median of 41 and the national average of 38. The 45 - 54 age bracket is large, accounting for 14.5% of residents, while the 25 - 34 bracket is small at 7.9% compared to Regional Qld. Since the 2021 Census, the 15 to 24 age bracket has risen from 11.2% to 13.2% of the population, and the 75 to 84 bracket has grown from 5.9% to 7.2%, whereas the 45 to 54 cohort fell from 16.9% to 14.5%. By 2041, demographic projections indicate shifts in the local age profile. The to age bracket is expected to increase by ( people) to reach from . Conversely, population drops are projected for the to and to age groups.

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Diddillibah currently has an estimated 71 children under 5 years old, comprising approximately 44 children aged 0-2 and 28 children aged 3-4. This cohort grew by an estimated 11% since the previous census. while population forecasts indicate future growth, with an anticipated increase of 15% by 2041 (to approximately 82 children). Meanwhile the 5-12 cohort currently amounts to 189. While growth has been positive birth rates observed in the area have been low, with approximately 7.1 births per 1,000 residents recorded over the latest two-year period analysed which ranks the area among the bottom 20% of areas assessed nationally.