Tatachilla is a quiet locality in South Australia within the Onkaparinga local government area (postcode 5171). It is home to about 231 residents, with a mature demographic and a median age of 45. Households earn a median income of $108K per year, with an average household size of 2.9 people. Recent annual estimates show population movement staying broadly stable across the broader catchment, with population growth running at +0.9% year-on-year at the LGA level. SA employment has moved +1.6% year-on-year in the official ABS Labour Force trend series, which provides the broader jobs backdrop for this suburb. SA also had 21 Commonwealth-backed major projects under construction, 7 underway, and 7 in planning as at 2025-09-01, which is useful as a broader delivery backdrop rather than a suburb-specific project count. The most common occupations are professionals, managers, clerical & administrative. Employment in the area leans toward healthcare and manufacturing. The top ancestries reported are English, Australian, Irish.
The median weekly rent is $280 (Census 2021). The median monthly mortgage repayment is $2,084.
The crime rate in the Onkaparinga LGA is moderate at 5,195 incidents per 100,000 population.
On the investment side, Population growth of +0.9% year-on-year points to stable demand fundamentals. Building approvals have changed +0% year-on-year, indicating steady development activity.