PlainZIP

Onawa, IA · standard

ZIP Code 51040

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

3,712
9/sq mi
$71,179
Median income
$151,600
Median home value
19.9%
Bachelor's or higher

The verdict

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

49th pct
household income, US ZIPs
26th pct
home value, US ZIPs
9
people per sq mi
75%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 51040 against every reporting US ZIP.

ZIP code 51040 covers 394.9 square miles in Onawa, Monona County, Iowa (a standard USPS delivery area), with a modest 3,712 residents on file, a density of 9 people per square mile, in the Chicago time zone.

ZIP 51040 lands in the middle-income range, with a median household income of $71,179 (7% below the Iowa average), while per-capita income is $33,598. 14.2% of residents live below the poverty line, and the unemployment rate reads 1.2%. Housing costs here run $151,600 for a typical home value (14% below the state average), with rent averaging $947 a month; 75.3% of homes are owner-occupied.

Educational attainment sits below the national norm: 19.9% of adults hold a bachelor's degree or higher, the median age is 37.6, and the average commute is 18 minutes. To put 51040 in local context, 2 ZIP codes within roughly 10 miles appear further down this page alongside 6 additional ZIPs in Monona County, for a geography-aware comparison.

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 51040

Top 5 sectors by establishment count in Onawa, IA

Which industries have the most business establishments in ZIP 51040.

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 51040, Onawa, 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

3,712

Population

394.9

Area (sq mi)

9

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 51040?

37.6

Median Age

47.9%

Male

52.1%

Female

0.0%

Foreign-Born

White 93.5%
African American 0.4%
Asian 0.0%
American Indian or Alaska Native 0.2%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 5.9%
Hispanic or Latino 1.4%

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?

$71,179

Median Household Income

-7% vs state

$33,598

Per Capita Income

14.2%

Poverty Rate

1.2%

Unemployment Rate

18.3 min

Mean Commute Time

How ZIP 51040 ranks nationally

Onawa, IA household income vs. every US ZIP code

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

$71,179 49th percentile higher than 49% 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 56.5%
Bachelor's Degree or Higher 19.9%

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

What does housing look like?

1,731

Total Housing Units

1,555

Occupied Units

176

Vacant Units

2.19

Avg Household Size

Occupancy Type

Owner 75.3%
Renter 24.7%

$151,600

Median Home Value

-14% vs state

$947

Median Rent

1961

Median Year Built

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

What businesses operate in this ZIP?

Census Bureau data shows 115 business establishments in ZIP 51040, employing approximately 1,156 people with a combined annual payroll of $50,687,000.

115

Businesses

1,156

Employees

$50.7M

Annual Payroll

13

Industry Sectors

Industry Establishments % of Total
Retail trade 20 17.4%
Other services (except public administration) 14 12.2%
Construction 12 10.4%
Health care and social assistance 12 10.4%
Accommodation and food services 11 9.6%
Wholesale trade 8 7.0%
Finance and insurance 8 7.0%
Professional, scientific, and technical services 6 5.2%
Manufacturing 4 3.5%
Administrative and support and waste management and remediation services 4 3.5%
Arts, entertainment, and recreation 4 3.5%
Transportation and warehousing 3 2.6%
Information 3 2.6%

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 51040 vs 51523 →

ZIP 51040 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 51040 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 51040 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 51040 ranks #3 of 3 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
51523 Blencoe, IA 357 8.5 mi
51063 Whiting, IA 1,100 9.0 mi

More ZIP Codes in Monona County

51034 standard
Mapleton, IA
Pop: 1,820
51063 standard
Whiting, IA
Pop: 1,100
51060 standard
Ute, IA
Pop: 615
51558 standard
Moorhead, IA
Pop: 560
51010 standard
Castana, IA
Pop: 456
51572 standard
Soldier, IA
Pop: 398

Related Areas

Monona County Onawa, IA Iowa

Frequently Asked Questions

What county is ZIP code 51040 in? ▼
ZIP code 51040 (Onawa) is located in Monona County, Iowa. Monona County contains multiple ZIP codes, see the full list at /counties/monona-ia.
What is the population of ZIP code 51040? ▼
ZIP code 51040 in Onawa, IA has a population of 3,712 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 51040? ▼
The median household income in ZIP 51040 is $71,179, which is 7% below the national average of $76,288.
What is the average home value in ZIP 51040? ▼
The median home value in ZIP 51040 is $151,600, which is 45% below the national average of $278,155.
What is the demographic makeup of ZIP 51040? ▼
The largest racial group in ZIP 51040 is White at 93.5%. Hispanic or Latino residents make up 1.4% of the population.
How many businesses are in ZIP code 51040? ▼
ZIP code 51040 has 115 business establishments employing approximately 1,156 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What are the main industries in ZIP code 51040? ▼
The top industries by establishment count in ZIP 51040 are: Retail trade (20), Other services (except public administration) (14), Construction (12). There are 13 industry sectors represented in total.
What is the education level in ZIP code 51040? ▼
In ZIP code 51040, 56.5% of residents aged 25+ have a high school diploma or higher, and 19.9% 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 51040? ▼
The mean commute time for workers in ZIP code 51040 is 18.3 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 51040? ▼
In ZIP code 51040, approximately 75.3% of occupied housing units are owner-occupied and 24.7% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 51040? ▼
The poverty rate in ZIP code 51040 is 14.2% 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.