PlainZIP

Knoxville, IA · standard

ZIP Code 50138

Marion County, Iowa - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.

11,720
27/sq mi
$74,693
Median income
$196,700
Median home value
28.0%
Bachelor's or higher

The verdict

Knoxville pairs an above-median household income with below-median home values, in a rural, homeowner-dominated area.

Top 46%
household income, US ZIPs
43th pct
home value, US ZIPs
27
people per sq mi
81%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 50138 against every reporting US ZIP.

ZIP code 50138 is a mid-sized community (a standard USPS delivery area) in Knoxville, Marion County, Iowa, home to 11,720 residents across 442.3 square miles, a density of 27 people per square mile, in the Chicago time zone.

ZIP 50138 lands in the middle-income range, with a median household income of $74,693 (2% below the Iowa average), while per-capita income is $41,015. Poverty here runs at 10.5%, with unemployment measured at 3.6%. The typical home here is valued at $196,700 (12% above the state average); renters pay a median of $815 monthly, and 80.9% of units are owner-occupied.

Educational attainment sits below the national norm: 28.0% of adults hold a bachelor's degree or higher, the median age is 42.9, and the average commute is 24 minutes. A geography-based comparison follows: 4 ZIP codes within about 10 miles of 50138, plus 6 more within Marion County, give a clearer read than the national average alone.

Every figure on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →

Top industries in ZIP 50138

Top 5 sectors by establishment count in Knoxville, IA

Which industries have the most business establishments in ZIP 50138.

establishments

What this shows Establishment counts come from the Census ZIP Code Business Patterns program, which counts physical business locations rather than employees or revenue.

Source U.S. Census Bureau · ZIP Code Business Patterns (ZBP) As of 2023

Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 50138, Knoxville, IA · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; FHFA HPI updated quarterly/annually.

Quick Facts

11,720

Population

442.3

Area (sq mi)

27

People / sq mi

Chicago

Time Zone

standard

ZIP Type

Neighborhood Scorecard
Get an A-F grade across income, safety, housing, rent, education, commute, and childcare for this ZIP code.
View Scorecard →

Who lives in ZIP 50138?

42.9

Median Age

47.4%

Male

52.6%

Female

1.5%

Foreign-Born

White 94.5%
African American 0.2%
Asian 1.3%
American Indian or Alaska Native 0.0%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 3.3%
Hispanic or Latino 1.8%

Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How much do residents earn?

$74,693

Median Household Income

-2% vs state

$41,015

Per Capita Income

10.5%

Poverty Rate

3.6%

Unemployment Rate

23.5 min

Mean Commute Time

How ZIP 50138 ranks nationally

Knoxville, IA household income vs. every US ZIP code

Median household income, the full national distribution, with this ZIP marked

$74,693 Top 46% higher than 54% of 30,318 US ZIPs

$0–$20,000: 118 US ZIPs (0%). Below this entry. $20,000–$40,000: 1,573 US ZIPs (5%). Below this entry. $40,000–$60,000: 7,092 US ZIPs (23%). Below this entry. $60,000–$80,000: 9,980 US ZIPs (33%). This entry sits in this band. $80,000–$100,000: 5,778 US ZIPs (19%). Above this entry. $100,000–$120,000: 2,855 US ZIPs (9%). Above this entry. $120,000–$140,000: 1,362 US ZIPs (4%). Above this entry. $140,000–$160,000: 686 US ZIPs (2%). Above this entry. $160,000–$180,000: 364 US ZIPs (1%). Above this entry. $180,000–$200,000: 186 US ZIPs (1%). Above this entry. $200,000–$220,000: 324 US ZIPs (1%). Above this entry. This ZIP $0 $200K+ every reporting US ZIP, bucketed by value

Each bar is a $20K-wide band; taller bars hold more US ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Census Bureau, ACS 5-Year Estimates · 2019–2023

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What is the education profile here?

High School Graduate or Higher 64.0%
Bachelor's Degree or Higher 28.0%

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What does housing look like?

5,133

Total Housing Units

4,663

Occupied Units

470

Vacant Units

2.33

Avg Household Size

Occupancy Type

Owner 80.9%
Renter 19.1%

$196,700

Median Home Value

+12% vs state

$815

Median Rent

1973

Median Year Built

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How have home values changed over time?

FHFA House Price Index, annual appreciation data based on repeat sales and appraisals

+2.7%

YoY Change (2024)

197

HPI Index (2000 = 100)

+97%

Total Change Since 2000

Home values in ZIP 50138 have increased 2.7% over the past year (2024). Since 2000, this ZIP has seen +97% cumulative appreciation.

Year Annual Change HPI Index
2020 -1.1% 145
2021 +8.9% 158
2022 +16.1% 183
2023 +4.8% 192
2024 +2.7% 197

Source: Federal Housing Finance Agency (FHFA) House Price Index, All-Transactions, Five-Digit ZIP Codes (Developmental Index). Index base = 100 in year 2000. Data through 2024. ZIP codes with few transactions may show missing values.

What businesses operate in this ZIP?

Census Bureau data shows 240 business establishments in ZIP 50138, employing approximately 3,841 people with a combined annual payroll of $195,533,000.

240

Businesses

3,841

Employees

$195.5M

Annual Payroll

14

Industry Sectors

Industry Establishments % of Total
Retail trade 35 14.6%
Health care and social assistance 31 12.9%
Accommodation and food services 31 12.9%
Other services (except public administration) 31 12.9%
Professional, scientific, and technical services 23 9.6%
Construction 16 6.7%
Finance and insurance 16 6.7%
Information 12 5.0%
Wholesale trade 9 3.8%
Manufacturing 8 3.3%
Administrative and support and waste management and remediation services 8 3.3%
Real estate and rental and leasing 6 2.5%
Arts, entertainment, and recreation 6 2.5%
Transportation and warehousing 5 2.1%

Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.

Nearby ZIP Codes

Want a side-by-side? Compare 50138 vs 50057 →

ZIP 50138 vs its nearest neighbors, by population

Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.

residents

What this shows Among its immediate neighbors, ZIP 50138 ranks the most populous - useful context the national average alone can't give.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023

ZIP 50138 vs its nearest neighbors, by median income

Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.

median income

What this shows By household income, ZIP 50138 ranks #2 of 5 neighboring ZIPs, local affluence varies block to block, not just metro to metro.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023
ZIP Code City Population Distance
50057 Columbia, IA 238 8.7 mi
50062 Melcher Dallas, IA 741 8.6 mi
50163 Melcher Dallas, IA 858 8.9 mi
50116 Hamilton, IA 299 10.7 mi

More ZIP Codes in Marion County

50219 standard
Pella, IA
Pop: 13,939
50225 standard
Pleasantville, IA
Pop: 2,940
50044 standard
Bussey, IA
Pop: 887
50163 standard
Melcher Dallas, IA
Pop: 858
50214 standard
Otley, IA
Pop: 850
50062 standard
Melcher Dallas, IA
Pop: 741

Related Areas

Marion County Knoxville, IA Iowa

Frequently Asked Questions

What county is ZIP code 50138 in? ▼
ZIP code 50138 (Knoxville) is located in Marion County, Iowa. Marion County contains multiple ZIP codes, see the full list at /counties/marion-ia.
What is the population of ZIP code 50138? ▼
ZIP code 50138 in Knoxville, IA has a population of 11,720 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 50138? ▼
The median household income in ZIP 50138 is $74,693, which is 2% below the national average of $76,288.
What is the average home value in ZIP 50138? ▼
The median home value in ZIP 50138 is $196,700, which is 29% below the national average of $278,155.
What is the demographic makeup of ZIP 50138? ▼
The largest racial group in ZIP 50138 is White at 94.5%. Hispanic or Latino residents make up 1.8% of the population.
How many businesses are in ZIP code 50138? ▼
ZIP code 50138 has 240 business establishments employing approximately 3,841 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What are the main industries in ZIP code 50138? ▼
The top industries by establishment count in ZIP 50138 are: Retail trade (35), Health care and social assistance (31), Accommodation and food services (31). There are 14 industry sectors represented in total.
How have home values changed in ZIP code 50138? ▼
According to the FHFA House Price Index, home values in ZIP 50138 increased by 2.7% in 2024. Since 2000, home values in this ZIP have appreciated by approximately 97%. This is a developmental index based on repeat sales and appraisal data from Fannie Mae and Freddie Mac.
What is the education level in ZIP code 50138? ▼
In ZIP code 50138, 64.0% of residents aged 25+ have a high school diploma or higher, and 28.0% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What is the average commute time in ZIP 50138? ▼
The mean commute time for workers in ZIP code 50138 is 23.5 minutes according to Census ACS data. The national average is roughly 26 minutes, so commuters here spend less time traveling to work than typical.
What percentage of residents own vs. rent in ZIP 50138? ▼
In ZIP code 50138, approximately 80.9% of occupied housing units are owner-occupied and 19.1% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 50138? ▼
The poverty rate in ZIP code 50138 is 10.5% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.

Read our methodology to see how this data is sourced, computed, and verified.