South Australia · Suburb Profile
Lock SA — Suburb Profile
Population, median income, rent prices, housing costs and demographics for Lock, South Australia. ABS Census 2021.
The population of Lock SA is 253 according to the 2021 Census. The median personal income in Lock is $729 per week ($37,908 per year). Median rent in Lock is $120 per week ($520 per month). Lock has a median age of 38 years, equal to the national median. Lock has a population density of 0.4 people per km².
The most common religion is No Religion (40% of residents). The median monthly mortgage repayment in Lock is $512.
There were 1 recorded offences in Lock in 2025-26, a rate of 4 offences per 1,000 people. The most common offence category was property damage (1 offences).
Lock Map
Lock Population
Lock Median Income & Rent
Lock Demographics
Gender Split
Population Density
Households
Lock Age Distribution
Source: ABS Census 2021 — Suburb & Locality (SAL)
Lock Housing Tenure
Source: ABS Census 2021 — Suburb & Locality (SAL)
Lock Country of Birth
Source: ABS Census 2021 G09 — Country of Birth by SAL
Lock Religion
Source: ABS Census 2021 G14 — Religion by SAL
Lock Education Level
Source: ABS Census 2021 G16 — Highest Year of School by SAL
Lock Employment
Source: ABS Census 2021 G46 — Labour Force Status by SAL
Lock Qualifications
Source: ABS Census 2021 G49 — Non-School Qualification by SAL
Lock Occupation
Source: ABS Census 2021 G51 — Industry of Employment by Occupation
Lock Field of Study
Source: ABS Census 2021 G51 — Field of Study by SAL
Lock Dwelling Types
Source: ABS Census 2021 G36 — Dwelling Structure by SAL
Lock Weekly Household Income
Source: ABS Census 2021 G33 — Household Income by SAL
Lock Marital Status
Source: ABS Census 2021 G05 — Marital Status by SAL
Lock Ancestry
Source: ABS Census 2021 G08 — Ancestry by SAL
Lock School & University Attendance
Source: ABS Census 2021 G15 — Type of Educational Institution by SAL
Lock Need for Assistance
Source: ABS Census 2021 G18 — Core Activity Need for Assistance by SAL
Lock Volunteering
Source: ABS Census 2021 G23 — Voluntary Work by SAL
Lock Monthly Mortgage Repayments
Source: ABS Census 2021 G38 — Mortgage Repayment by SAL
Lock How People Get to Work
Source: ABS Census 2021 G62 — Method of Travel to Work by SAL
Lock Car Ownership
Source: ABS Census 2021 G34 — Motor Vehicles per Dwelling by SAL
Lock Number of Bedrooms
Source: ABS Census 2021 G41 — Number of Bedrooms by SAL
Lock Population Mobility
Source: ABS Census 2021 G43 — Summary by SAL
Lock Indigenous Population
Source: ABS Census 2021 G07 — Indigenous Status by SAL
Lock Long-term Health Conditions
Source: ABS Census 2021 G19 — Long-term Health Conditions by SAL
Lock Personal Weekly Income Distribution
Source: ABS Census 2021 G17 — Personal Income by SAL
Lock Family Structure
Source: ABS Census 2021 G29 — Family Composition by SAL
Lock Military Service
Source: ABS Census 2021 G22 — ADF Service by SAL
Lock Unpaid Carers
Source: ABS Census 2021 G25 — Unpaid Assistance by SAL
Lock Children Ever Born
Source: ABS Census 2021 G28 — Children Ever Born by SAL
Lock When Migrants Arrived
Source: ABS Census 2021 G10 — Year of Arrival by SAL
Lock Unpaid Domestic Work
Source: ABS Census 2021 G24 — Unpaid Domestic Work by SAL
Lock Household Size
Source: ABS Census 2021 G35 — Household Size by SAL
Lock Where Residents Moved From
Source: ABS Census 2021 G44 — Address 1 Year Ago by SAL
Lock Family Blending
Source: ABS Census 2021 G31 — Family Blending by SAL
Lock Crime Statistics
Reported offences in 2025-26 — 1 total
Offence trend by year:
Source: SA Government Open Data — data.sa.gov.au
Lock Schools
Source: ACARA — Australian Curriculum, Assessment and Reporting Authority, 2025. ICSEA = Index of Community Socio-Educational Advantage (national average 1000).
View all schools in Lock with map →Lock Rent Prices & Affordability
Rent is under 25% of household income — generally considered affordable.
If you earn X in Lock
Lock vs State & National Average
Nearby Suburbs in SA
Frequently Asked Questions About Lock
What is the population of Lock SA?
The population of Lock SA is 253 according to the ABS Census 2021.The suburb has a population density of 0.4 people per km².Lock is ranked #6,393 out of 14,663 suburbs by population.
What is the median income in Lock?
The median personal income in Lock SA is $729 per week, or $37,908 per year.The median household income is $1,125 per week.Family income is $1,375 per week.Lock is ranked #4,936 by income out of 14,663 Australian suburbs.
How much is rent in Lock?
Median rent in Lock SA is $120 per week ($520 per month).Rent represents 10.7% of household income, which is considered affordable.Lock ranks #8,508 out of 14,663 suburbs by rent.
What are mortgage repayments in Lock?
The median monthly mortgage repayment in Lock SA is $512. This data comes from the ABS Census 2021 and reflects mortgage repayments for owner-occupied dwellings.
What is the median age in Lock?
The median age in Lock SA is 38 years.This is equal to the national median age of 38 years.
Is Lock a good suburb to live in?
Lock is a suburb in South Australia with a population of 253.The median income is $729/wk, which is below the SA average of $763/wk.Rent affordability is rated as affordable (10.7% of household income). See the full suburb profile above for detailed statistics.
Looking for schools, childcare centres, and playgrounds in this area? See kid.com.au for family facilities data.
Data: Australian Bureau of Statistics, Census of Population and Housing 2021. SA2 area: 40774. All dollar figures in AUD.