What is the population of Affton CDP?

Affton CDP has 20,035 residents on Census ACS 2019-2023 ACS 5-year estimates, ranking #39 of 1,082 in Missouri.

What is the median household income in Affton CDP?

Median household income in Affton CDP is $77,337 a year, 1.5% below the national figure of $78,538.

How much does it cost to rent or buy in Affton CDP?

Median gross rent is $978 a month and the median home value is $200,300, so rent absorbs about 15.2% of median household income.

Is Affton CDP affordable compared with the rest of the US?

Homes cost about 2.6× the local median income here versus roughly 3.9× nationally, so Affton CDP is more affordable to buy in than the typical US market, and rent takes 15.2% of median income against the 30% cost-burden line.

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Missouri · Census place 00280

Affton, MO population, income and ZIP codes

Quick answer

The population of the city of Affton, Missouri (Affton, MO — Census place “Affton CDP”) is 20,035 residents, ranking #39 of 1082 places in Missouri. Median household income is $77,337, the median home is worth $200,300 and median gross rent runs $978 a month. Looking for the Affton Missouri ZIP code list? 1 ZIP codes serve Affton, MO: 63123.

Population: 20,035Affton CDP residents
Median household income: $77,337Past 12 months, inflation adjusted
Median home value: $200,300Owner-occupied units
Median gross rent: $978Rent plus utilities, monthly
Median age: 41.7 yrsAll residents
Homeownership rate: 80.5%Owner-occupied households

Affton ZIP codes (Missouri)

Census ZCTAs whose delivery area overlaps Affton.

The Affton MO ZIP code list below covers 1 ZIP code. Open any one for its population, income, housing and rent profile.

63123

What the numbers mean in Affton CDP

Housing cost measured against local earnings.

A household earning the Affton CDP median would spend about 15.2% of gross income on the median rent. The 30% mark is the federal threshold for cost burden, so anything above it signals a stretched rental market. The median home costs 2.6× the median household income; nationally that ratio sits near 4.5×. Poverty affects 5.6% of residents and 80.5% of households own their home.

Source: US Census Bureau, ACS 2019-2023 5-year estimates · rates as published for 2019-2023 ACS 5-year

Affton CDP, MO in context

How this area compares with national benchmarks.

Affton CDP is a mid-size town in Missouri, with 20,035 residents counted in the Census American Community Survey 2019-2023 ACS 5-year estimates, which places it #39 of 1,082 ranked by population — larger than 96% of them. The median age here is 41.7 years against 39.1 nationally, a slightly older profile than the country as a whole. Places under 65,000 residents only appear in the five-year release, never the one-year file, so these values pool sixty months of responses and lag the current year by design.

Households in Affton CDP earn a median of $77,337 a year, 1.5% below the national figure of $78,538 and 39% above the $55,543 median for the 374 Missouri cities we cover. Household income here is measured before tax and pooled across everyone at the address, which is why it reads higher than typical individual earnings in the same area. Poverty reaches 5.6% of residents here, less than half the 12.4% national rate.

The typical owner-occupied home in Affton CDP is valued at $200,300, 34% below the national figure and 31% above the $152,400 peer median, while median gross rent runs $978 a month, 30.4% below the national figure, or roughly $11,736 across a full year. A household on the local median income would put about 15.2% of gross pay toward that rent against the federal 30% cost-burden threshold, so renting here is cheap relative to what people here earn. The home-price-to-income ratio works out to 2.6×, against roughly 3.9× nationally, so buying is easier here than in the average US market. 80.5% of occupied homes are owner-occupied versus 65% nationally, an owner-dominated market where rental listings are scarce and rent medians rest on a thin sample. The rent line includes utilities paid by the tenant, a definition worth remembering when comparing it against a landlord's quoted rate.

All values below were released by the Census for this exact geography, with no gap-filling on our side. Small-area estimates still carry wider margins of error than state or national figures, so check the linked ACS tables before relying on them for lending, appraisal or legal work.

Compare with nearby places

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Frequently asked questions

Common questions about this area.

What is the population of Affton CDP?: Affton CDP has 20,035 residents on Census ACS 2019-2023 ACS 5-year estimates, ranking #39 of 1,082 in Missouri.
What is the median household income in Affton CDP?: Median household income in Affton CDP is $77,337 a year, 1.5% below the national figure of $78,538.
How much does it cost to rent or buy in Affton CDP?: Median gross rent is $978 a month and the median home value is $200,300, so rent absorbs about 15.2% of median household income.
Is Affton CDP affordable compared with the rest of the US?: Homes cost about 2.6× the local median income here versus roughly 3.9× nationally, so Affton CDP is more affordable to buy in than the typical US market, and rent takes 15.2% of median income against the 30% cost-burden line.
How current is this Affton CDP data?: All figures come from the US Census Bureau American Community Survey 2019-2023 ACS 5-year five-year estimates. Places under 65,000 residents only appear in the five-year release, never the one-year file, so these values pool sixty months of responses and lag the current year by design.