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Victoria · Postcode 3934
Mount Martha postcode and suburb data
Victoria · Phone area code 03 · 53 km from Melbourne
Suburb snapshot
Mount Martha at a glance vs VIC
Fast facts and benchmark bars show the suburb's key postcode, Census, SEIFA, school and LGA signals in context.
Quick facts
Benchmarks against VIC
Income, rent and SEIFA figures are from the ABS 2021 Census and are reported in 2021 dollars, not adjusted for subsequent inflation.
Where Mount Martha ranks: household income is in the top 25% of VIC suburbs; rents are among the top 10% in VIC; SEIFA decile 9 puts it in the top 20% of Australia for socio-economic advantage.
ABS Census 2021 · SEIFA 2021Detailed comparison table
Mount Martha vs the VIC average and the national average, using population-weighted 2021 Census data.
| Metric | Mount Martha | VIC avg | AU avg |
|---|---|---|---|
| Household income/wk | $2,097 +VIC | $1,817 | $1,836 |
| Rent/wk | $496 +VIC | $375 | $390 |
| Mortgage/month | $2,167 +VIC | $1,933 | $1,958 |
| Median age | 46 | 46.0 | 45.0 |
| SEIFA decile | 9/10 +VIC | 6.0/10 | 6.0/10 |
| Unemployment | 2.8% -VIC | 5.0% | 5.0% |
Green pill = at least 10% above the VIC average; red = at least 10% below; grey = within 10%. For unemployment, colour polarity is inverted: lower is better.
Mount Martha is a coastal suburb of Melbourne in Victoria, with postcode 3934. It sits about 53 km from the Melbourne CBD, within the Mornington Peninsula local government area. The suburb footprint covers roughly 30.2 square kilometres.
According to the 2021 Census, Mount Martha has a population of 19,846 with a median age of 46. The median weekly household income is $2,097, above the VIC average. The unemployment rate is 2.8%, lower than the VIC average. The Indigenous population is 119 (0.6% of residents).
Housing in Mount Martha includes a median weekly rent of $496, median monthly mortgage repayment of $2,167, with 7,022 total dwellings. These housing costs sit above the VIC average. Owner-occupied dwellings (owned or mortgaged) make up 87.5% of housing.
On the SEIFA Index of Relative Socio-economic Advantage and Disadvantage, Mount Martha scores in decile 9 out of 10, which is well above the national average.
Schools in Mount Martha include Balcombe Grammar School, Osborne Primary School and Mount Martha Primary School.
Mount Martha is part of the Mornington Peninsula statistical area in Victoria.
Mount Martha details
Location, Census, housing, SEIFA and geography fields used across this profile.
| Postcode | 3934 |
| State | Victoria (VIC) |
| Phone Area Code | 03 |
| Population (2021) | 19,846 |
| Median Age | 46 years |
| Median Household Income (Census 2021) | $2,097/week |
| Median Personal Income (Census 2021) | $846/week |
| Median Weekly Rent (Census 2021) | $496 |
| Median Monthly Mortgage (Census 2021) | $2,167 |
| Average Household Size | 2.7 persons |
| Area | 30.2 km² |
| Population Density | 657/km² |
| Total Dwellings | 7,022 |
| Australian Citizens | 91.2% |
| Indigenous Population | 119 (0.6%) |
| Unemployment Rate | 2.8% |
| SEIFA IRSAD Decile | 9/10 (well above average) |
| Latitude | -38.287039 |
| Longitude | 145.016269 |
| Distance from Melbourne | 53 km |
| Region (SA4) | Mornington Peninsula |
| Area (SA3) | Mornington Peninsula |
| Local Government | Mornington Peninsula |
| Federal Electorate | Flinders |
| State Electorate | Nepean (Eastern Victoria) |
| Time Zone | AEST (UTC+10), Australia/Melbourne (standard time) |
Age Profile
Show counts
| 0–14 years | 3,815 (19.2%) |
| 15–24 years | 2,272 (11.4%) |
| 25–44 years | 3,390 (17.1%) |
| 45–64 years | 5,646 (28.4%) |
| 65+ years | 4,720 (23.8%) |
Housing Tenure
SEIFA socio-economic index
Health Conditions (2021 Census)
| Arthritis | 2,000 (10.1%) |
| Asthma | 1,686 (8.5%) |
| Heart Disease | 978 (4.9%) |
| Cancer | 863 (4.3%) |
| Diabetes | 727 (3.7%) |
| Lung Condition | 305 (1.5%) |
| Dementia | 172 (0.9%) |
Long-term health conditions self-reported in the 2021 Census. Persons may report more than one condition.
Motor Vehicles per Dwelling
| No vehicle | 149 (2.1%) |
| 1 vehicle | 1,964 (28.2%) |
| 2 vehicles | 3,252 (46.7%) |
| 3+ vehicles | 1,601 (23.0%) |
Schools in Mount Martha
ACARA 2025 school profiles for schools located in Mount Martha. ICSEA is shown where ACARA publishes it.
Suburbs Near Mount Martha
More Mount Martha Data
Page last reviewed . Data sources: Australian Bureau of Statistics 2021 Census (CC BY 4.0), SEIFA 2021 IRSAD, ACARA school profiles 2025. How this data is sourced.