South Australia · Postcode 5019
Semaphore postcode and suburb data
South Australia · Phone area code 08 · 15 km from Adelaide
Suburb snapshot
Semaphore at a glance vs SA
Fast facts and benchmark bars show the suburb's key postcode, Census, SEIFA, school and LGA signals in context.
Quick facts
Benchmarks against SA
Income, rent and SEIFA figures are from the ABS 2021 Census and are reported in 2021 dollars, not adjusted for subsequent inflation.
Detailed comparison table
Semaphore vs the SA average and the national average, using population-weighted 2021 Census data.
| Metric | Semaphore | SA avg | AU avg | Greater Adelaide |
|---|---|---|---|---|
| Household income/wk | $1,718 +SA | $1,545 | $1,836 | $1,620 |
| Rent/wk | $320 ≈SA | $308 | $390 | $329 |
| Mortgage/month | $1,733 +SA | $1,558 | $1,958 | $1,666 |
| Median age | 50 | 45.0 | 45.0 | 42.0 |
| SEIFA decile | 7/10 +SA | 5.0/10 | 6.0/10 | 7.0/10 |
| Unemployment | 4.1% -SA | 6.0% | 5.0% | 6.0% |
Green pill = at least 10% above the SA average; red = at least 10% below; grey = within 10%. For unemployment, colour polarity is inverted: lower is better.
Semaphore is a coastal suburb of Adelaide in South Australia, with postcode 5019. It sits about 15 km from the Adelaide CBD, within the Port Adelaide Enfield local government area. The suburb footprint covers roughly 1.1 square kilometres.
According to the 2021 Census, Semaphore has a population of 2,749 with a median age of 50. The median weekly household income is $1,718, above the SA average. The unemployment rate is 4.1%, lower than the SA average. The Indigenous population is 51 (1.9% of residents).
Housing in Semaphore includes a median weekly rent of $320, median monthly mortgage repayment of $1,733, with 1,141 total dwellings. These housing costs sit above the SA average. Owner-occupied dwellings (owned or mortgaged) make up 69.3% of housing.
On the SEIFA Index of Relative Socio-economic Advantage and Disadvantage, Semaphore scores in decile 7 out of 10, which is above the national average.
Semaphore is served by Dominican School.
Semaphore is part of the Port Adelaide - West statistical area in South Australia.
Semaphore details
Location, Census, housing, SEIFA and geography fields used across this profile.
| Postcode | 5019 |
| State | South Australia (SA) |
| Phone Area Code | 08 |
| Population (2021) | 2,749 |
| Median Age | 50 years |
| Median Household Income (Census 2021) | $1,718/week |
| Median Personal Income (Census 2021) | $857/week |
| Median Weekly Rent (Census 2021) | $320 |
| Median Monthly Mortgage (Census 2021) | $1,733 |
| Average Household Size | 2.2 persons |
| Area | 1.1 km² |
| Population Density | 2593/km² |
| Total Dwellings | 1,141 |
| Australian Citizens | 88.9% |
| Indigenous Population | 51 (1.9%) |
| Unemployment Rate | 4.1% |
| SEIFA IRSAD Decile | 7/10 (above average) |
| Latitude | -34.838889 |
| Longitude | 138.483889 |
| Distance from Adelaide | 15 km |
| Region (SA4) | Adelaide - West |
| Area (SA3) | Port Adelaide - West |
| Local Government | Port Adelaide Enfield |
| Federal Electorate | Hindmarsh |
| State Electorate | Port Adelaide |
| Time Zone | ACST (UTC+9:30), Australia/Adelaide (standard time) |
Age Profile
Show counts
| 0–14 years | 312 (11.3%) |
| 15–24 years | 253 (9.2%) |
| 25–44 years | 565 (20.6%) |
| 45–64 years | 1,060 (38.6%) |
| 65+ years | 555 (20.2%) |
Housing Tenure
SEIFA socio-economic index
Health Conditions (2021 Census)
| Arthritis | 286 (10.4%) |
| Asthma | 285 (10.4%) |
| Diabetes | 137 (5.0%) |
| Heart Disease | 121 (4.4%) |
| Cancer | 115 (4.2%) |
| Lung Condition | 76 (2.8%) |
| Dementia | 40 (1.5%) |
Long-term health conditions self-reported in the 2021 Census. Persons may report more than one condition.
Motor Vehicles per Dwelling
| No vehicle | 93 (8.2%) |
| 1 vehicle | 458 (40.2%) |
| 2 vehicles | 418 (36.7%) |
| 3+ vehicles | 171 (15.0%) |
Schools in Semaphore
ACARA 2025 school profiles for schools located in Semaphore. ICSEA is shown where ACARA publishes it.
Suburbs Near Semaphore
Same Postcode (5019)
More Semaphore 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.