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ZIP Code · IA

ZIP 50138

Pop. 11,117·Marion County·46th most expensive ZIP in Iowa
Median rent (all units)
$941/mo
Year-over-Year
-9.0%
Month-over-Month
+3.8%
vs US Median
-$1,024
Rising (Monthly)
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Most AffordableMost Expensive
ZIP 50138 · $941
More affordable than 99% of US ZIP codes · National median $1,965/mo
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Medians by bedroom

Rent by unit size

Studio
$660
1 BR
$760
2 BR
$960
3 BR
$1,150
4 BR+
$1,280
Research median
$960/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: July 20, 2026

Annual cost
$11,292/yr
At $941/mo median
Location
StateIA
CountyMarion 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 (-9.0% YoY, +3.8% MoM), not inventory.
Demographics

Who lives here

ZIP 50138 (Knoxville, IA) is majority owner-occupied, has a large retiree population, 28% of residents hold a bachelor's degree or higher.

Population
11,117
Median income
$74,693
Median age
42.9
Renters
19.1%
Age distribution
19.7%
20.8%
22.7%
14.7%
22.1%
Under 1819.7%
18–3420.8%
35–5422.7%
55–6414.7%
65+22.1%
Gender
47.4%
52.6%
Male47.4%
Female52.6%
Race & ethnicity
94.5%
White94.5%
Hispanic1.8%
Asian1.3%
Other2.1%
Education (25+)
36%
29.3%
28%
No HS diploma6.7%
HS diploma36%
Some college29.3%
Bachelor's+28%
Housing tenure
80.9%
19.1%
Owner80.9%
Renter19.1%

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

2021 vs 2026

How ZIP 50138 in Knoxville, IA has changed in 5 years

Income
$58,852 → $74,693
up 26.9%
Population
11,994 → 11,117
down 7.3%
Renter share
27.2% → 19.1%
-8.1 pts
Bachelor's+
23.7% → 28%
+4.3 pts

Census figures show median household income at $74,693 today, compared with $58,852 five years earlier. The population has contracted by 7.3% since 2021, moving from about 11,994 residents to roughly 11,117. Renters now make up 19.1% of households, compared with 27.2% five years ago. College-educated residents now make up 28% of adults here, versus 23.7% in 2021.

Community

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Local insights

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About renting in ZIP 50138

Last updated: July 20, 2026

ZIP code 50138 covers Knoxville, IA. The median rent here is $941/mo as of July 2026. A 1-bedroom rents for a median of $760/mo. A 2-bedroom rents for a median of $960/mo.

At 15% of local median household income ($74,693/yr), ZIP 50138 ranks as affordable compared to the national benchmark of 30%. Rents have decreased 9.0% over the past year.

FAQ

Frequently asked questions

How much is rent in ZIP code 50138?

As of July 20, 2026, the median monthly rent in ZIP 50138 (Knoxville, IA) is $941. This is based on aggregated data from public sources and community submissions.

How does ZIP 50138 rent compare to the US average?

ZIP 50138's median rent of $941/mo is $1,024 (52%) below the US national median of $1,965/mo.

How does ZIP 50138 compare to other ZIPs in Iowa?

ZIP 50138 is among the more affordable ZIP codes in Iowa, ranking #46 out of 55 ZIPs at $941/mo.

How much income do you need to rent in ZIP 50138?

To keep rent at or below 30% of gross income, you would need to earn at least $38,000/year (~$18/hour full-time) to afford the median rent of $941/mo in ZIP 50138. The local median household income is $74,693/yr, meaning the typical household meets that threshold.

Is rent going up or down in ZIP 50138?

Rent in ZIP 50138 has decreased 9.0% over the past year as of July 20, 2026, offering some relief compared to 12 months ago.

Is ZIP 50138 an affordable place to rent?

ZIP 50138 is considered very affordable for renters. At $941/mo, rent takes approximately 15% of the local median household income ($74,693/yr). The standard benchmark is 30%. ZIP 50138 falls comfortably within that range.

What percentage of ZIP 50138 residents rent vs. own?

According to Census data, approximately 19.1% of ZIP 50138 households are renters, while 80.9% are owner-occupied. ZIP 50138 leans toward homeownership, which can mean a smaller rental inventory.

How does ZIP 50138 compare to the rest of Knoxville?

ZIP 50138 sits right at the Knoxville citywide median of $941/mo.

When was rent data for ZIP 50138 last updated?

Rent data for ZIP 50138 reflects July 20, 2026. RentDataNow refreshes all data monthly using public and private datasets.
Income Affordability
15%
VERY AFFORDABLE

At $941/mo, rent takes ~15% of ZIP 50138's median household income ($74,693/yr). The standard benchmark is 30%.

ZIP 50138 15%Benchmark 30%
State income tax3.8%
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Schools nearby

Public schools near ZIP 50138 (Knoxville, IA)

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