ZIP Code · MO

ZIP 63123

Part of Affton, MO

Pop. 49,077·Saint Louis County·66th most expensive ZIP in Missouri

Median rent (all units)

$1,452/mo

Year-over-Year

+0.6%

Month-over-Month

-0.6%

vs US Median

-$480

Reported rents

Falling (Monthly)

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Most AffordableMost Expensive

ZIP 63123 · $1,452

More affordable than 76% of US ZIP codes · National median $1,932/mo

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Medians by bedroom

Rent by unit size

Studio

$960

1 BR

$1,000

2 BR

$1,230

3 BR

$1,580

4 BR+

$1,830

Research median

$1,230/mo

Bedroom estimates are gross rents that include essential utilities (electricity, water, gas, sewer, trash).

Rent trends

12-month history

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Last updated: October 17, 2026

From the history

What the numbers show

Compared with the peak

Rent in ZIP 63123 is 0.9% below its high of $1,465 in June 2026, at $1,452 as of September 2026.

Past year vs. the rest of Missouri

Rent in ZIP 63123 changed +0.6% over the year to September 2026. Across the 119 Missouri ZIP codes Zillow tracks, the typical change was +4.6%.

Recent direction

Rent rose in 8 of the last 12 months.

What a typical income covers

30% of the median household income ($77,055) is $1,926 a month. That covers HUD's Fair Market Rent for up to a 4-bedroom ($1,830).

Cheaper nearby

ZIP 63125, 3 miles away, rents for 15% less ($1,238/mo), about $2,600 a year in savings.

From Zillow's monthly rent index (ZORI) for ZIP 63123. Income is the Census median household income (5-year estimates). Fair Market Rents are HUD’s, which include utilities.

Annual cost

$17,424/yr

At $1,452/mo median

Location

CityAffton

StateMO

CountySaint Louis County

Rent Market Meter

Balanced Market

Renter's MarketBalancedLandlord's Market

Rents are roughly steady, with neither renters nor landlords holding a strong edge right now.

Based on rent-price momentum (+0.6% YoY, -0.6% MoM), not inventory.

Demographics

Who lives here

ZIP 63123 (Affton, MO) is majority owner-occupied, 37.6% of residents hold a bachelor's degree or higher.

Population

49,077

Median income

$77,055

Median age

40.9

Renters

25.1%

Age distribution

18.3%

21.6%

26.4%

14.3%

19.4%

Under 1818.3%

18–3421.6%

35–5426.4%

55–6414.3%

65+19.4%

Gender

48.4%

51.6%

Male48.4%

Female51.6%

Race & ethnicity

82.5%

White82.5%

Black4%

Hispanic4.1%

Asian4.8%

Other4.6%

Education (25+)

24.9%

30%

37.6%

No HS diploma7.5%

HS diploma24.9%

Some college30%

Bachelor's+37.6%

Housing tenure

74.9%

25.1%

Owner74.9%

Renter25.1%

Source: U.S. Census Bureau · ACS 2024 5-Year Estimates

2022 vs 2026

How ZIP 63123 in Affton, MO has changed in 5 years

Rent

$1,145 → $1,452

up 26.8%

Income

$65,693 → $77,055

up 17.3%

Population

49,886 → 49,077

down 1.6%

Renter share

28.6% → 25.1%

-3.5 pts

Bachelor's+

34.6% → 37.6%

+3.0 pts

The median rent in ZIP 63123 in Affton, MO stood at $1,145 in 2022 and currently runs about $1,452, reflecting a 26.8% increase over the period. Local incomes tracked alongside that move, going from a median of $65,693 in 2021 to $77,055 more recently. That spread, with rent up faster than earnings, points to a tougher affordability environment than five years ago. The population has contracted by 1.6% since 2021, moving from about 49,886 residents to roughly 49,077. Renters now make up 25.1% of households, compared with 28.6% five years ago. College-educated residents now make up 37.6% of adults here, versus 34.6% in 2021. These shifts give renters and would-be renters a longer baseline for sizing up today's listings against the ZIP 63123 in Affton, MO market of 2022.

Community

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About renting in ZIP 63123

Last updated: October 17, 2026

ZIP code 63123 covers Affton, MO. The median rent here is $1,452/mo as of October 2026. A 1-bedroom rents for a median of $1,000/mo. A 2-bedroom rents for a median of $1,230/mo.

At 23% of local median household income ($77,055/yr), ZIP 63123 ranks as affordable compared to the national benchmark of 30%. Rents have increased 0.6% over the past year.

FAQ

Frequently asked questions

How much income do you need to rent in ZIP 63123?

To keep rent at or below 30% of gross income, you would need to earn at least $58,000/year (about $28/hour full-time) to afford the median rent of $1,452/mo in ZIP 63123. The local median household income is $77,055/yr, so the typical household meets that bar.

Is rent going up or down in ZIP 63123?

Rent in ZIP 63123 has risen 0.6% over the past year as of September 2026. It sits 0.9% below its high of $1,465 in June 2026.

How does ZIP 63123 compare to other ZIPs in Missouri?

ZIP 63123 is in the middle among Missouri ZIP codes for rent, ranking #66 of 137 at $1,452/mo. Over the year to September 2026, rent in ZIP 63123 changed +0.6%, against a typical +4.6% across the 119 Missouri ZIP codes Zillow tracks.