Trentham (Vic.)

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As of Feb 2026, Trentham's population is estimated at around 1,551. This reflects an increase from the 2021 Census figure of 1,382 people, representing a growth of 169 people (12.2%). The change was inferred from Districts estimates based on ERP data released by ABS in June 2024 and additional validated new addresses since the Census date. This results in a population density ratio of 30 persons per square kilometer. Trentham's growth rate exceeded the SA3 area (7.3%) and Rest of Vic., marking it as a growth leader in the region. Interstate migration contributed approximately 59.0% of overall population gains during recent periods.

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Trentham has an educated workforce with strong professional services representation. Its unemployment rate was 1.1% as of December 2025, according to Districts' statistical area data aggregation. In December 2025715 residents were employed at a rate 2.6% lower than Regional Vic.'s 3.7%.

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Districts aggregated latest postcode level ATO data released for financial year 2023. Trentham's median taxpayer income was $45,218 and average was $66,548. These figures are slightly lower than national averages of $50,954 and $62,728 in Regional Vic. respectively. Based on Wage Price Index growth of 8.25% since financial year 2023, current estimates for Trentham would be approximately $48,948 (median) and $72,038 (average) by September 2025. According to 2021 Census figures, household, family, and personal incomes in Trentham rank modestly between the 33rd and 35th percentiles. Income distribution shows that 28.0% of individuals earn between $1,500 - 2,999 annually, aligning with regional levels at 30.3%. Housing costs are manageable with retained income, but disposable income ranks below average at the th percentile. Trentham's SEIFA income ranking places it in the th decile.

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The dwelling structure in Trentham, as per the latest Census, consisted of 95.5% houses and 4.5% other dwellings (semi-detached, apartments, 'other' dwellings), compared to Regional Vic.'s 90.1% houses and 9.9% other dwellings. Home ownership in Trentham stood at 55.6%, with the rest of dwellings either mortgaged (32.2%) or rented (12.2%). The median monthly mortgage repayment was $1,733, higher than Regional Vic.'s average, while the median weekly rent was $386, compared to Regional Vic.'s $285. Nationally, Trentham's mortgage repayments were lower than the Australian average of $1,863, but rents exceeded the national figure of $375.

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Family households constitute 69.4% of all households, including 18.8% couples with children, 43.2% couples without children, and 5.8% single parent families. Non-family households comprise the remaining 30.6%, with lone person households at 29.3% and group households making up 2.2%. The median household size is 2.2 people, which is smaller than the Regional Vic. average of 2.4.

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Trentham's educational attainment is notably higher than broader standards. Among residents aged 15+, 38.8% possess university qualifications, compared to 21.7% in the rest of Victoria and 24.6% in the SA4 region. This educational advantage indicates strong potential for knowledge-based opportunities. Bachelor degrees are most prevalent at 22.9%, followed by postgraduate qualifications (10.5%) and graduate diplomas (5.4%). Vocational credentials are also prominent, with 34.8% of residents aged 15+ holding such qualifications – advanced diplomas comprise 13.9% and certificates make up 20.9%.

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Trentham has one active public transport stop. It is served by one route offering 44 weekly passenger trips in total. Transport accessibility is limited, with residents typically located 709 meters from the nearest stop. Most residents commute outward daily. Car remains the dominant mode of transport at 90%, while 8% walk. On average, there are 1.6 vehicles per dwelling.

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Analysis of health metrics shows strong performance throughout Trentham. Mortality rates and chronic condition prevalence were very low across all age groups.

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Trentham's cultural diversity was found to be below average, with 80.5% of its population born in Australia, 88.5% being citizens, and 96.7% speaking English only at home. Christianity is the dominant religion in Trentham, comprising 38.0% of people, but Judaism is notably underrepresented at 0.0%, compared to Regional Vic's average of 0.1%. Regarding ancestry, the top three groups are English (33.2%), Australian (23.0%), and Irish (14.9%).

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The median age in Trentham is 56 years, notably exceeding Regional Victoria's average of 43 years and significantly higher than Australia's 38 years. The 55-64 age group shows strong representation at 20.6%, compared to Regional Victoria, while the 25-34 cohort is less prevalent at 5.5%. This concentration in the 55-64 age group is well above the national average of 11.2%. According to the 2021 Census, the 15 to 24 age group has grown from 5.5% to 7.5%, while the 75 to 84 cohort increased from 10.6% to 12.1%. Conversely, the 45 to cohort has declined from to , and the to group dropped from to . Looking ahead to demographic projections reveal significant shifts in Trentham's age structure. The to cohort shows the strongest projected growth at , adding residents to reach . Population declines are projected for the to and to cohorts.

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Trentham currently has an estimated 66 children under 5 years old, comprising approximately 33 children aged 0-2 and 22 children aged 3-4. This cohort grew by an estimated 14% since the previous census. while population forecasts indicate future growth, with an anticipated increase of 8% by 2041 (to approximately 71 children). Meanwhile the 5-12 cohort currently amounts to 100. While growth has been positive birth rates observed in the area have been low, with approximately 6.5 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. This rate has slowed down slightly in recent years however.