ZIP Code Tabulation Area · Iowa

ZIP Code 51040: Monona County, IA

ZIP Code 51040 (Monona County, Iowa) has an estimated 3,500 residents in 1,555 households. The median household income is $71,179, the median home value is $151,600 and the median gross rent is $947/mo. Figures are U.S. Census Bureau American Community Survey 2020–2024 5-year estimates for the matching ZIP Code Tabulation Area.

American Community Survey 2020–2024 5-year estimates · Updated Oct 26, 2026

Total population

3,500

Margin of error ±154

Median household income

$71,179

Margin of error ±$9,265

Median home value

$151,600

Margin of error ±$17,730

Median gross rent

$947/mo

Margin of error ±$270

Median age

37.6 yrs

Margin of error ±2.9 yrs

Mean travel time to work

18.3 min

Margin of error ±3.7 min

How ZIP 51040 compares with Iowa and the U.S.

State and national figures are the Census Bureau's own estimates for those areas from the same ACS release, not averages of ZIP codes.

Median age

ZIP 5104037.6 yrsIowa38.6 yrsUnited States38.9 yrs

Median household income

ZIP 51040$71,179Iowa$75,059United States$80,734

Per capita income

ZIP 51040$33,598Iowa$40,877United States$44,673

Poverty rate

ZIP 5104014.2%Iowa11.1%United States12.5%

Unemployment rate

ZIP 510401.2%Iowa3.6%United States5.2%

Bachelor's degree or higher

ZIP 5104019.9%Iowa31.4%United States35.7%

Median home value

ZIP 51040$151,600Iowa$208,000United States$332,700

Median gross rent

ZIP 51040$947/moIowa$972/moUnited States$1,413/mo

Owner-occupied homes

ZIP 5104075.3%Iowa71.7%United States65.2%

Mean travel time to work

ZIP 5104018.3 minIowa19.8 minUnited States26.4 min

Worked from home

ZIP 510405.9%Iowa11.3%United States15.1%

All figures for ZIP 51040

Each estimate has a 90% margin of error: the true value is likely within that range. * marks estimates with a large margin of error (a coefficient of variation above 30%, or ±10 percentage points or more for rates).

ZIP 51040 — ACS 2020–2024 5-year estimates
Measure	ZIP 51040	Margin of error	Iowa	United States
Total population	3,500	±154	3,210,507	334,922,499
Median age	37.6 yrs	±2.9 yrs	38.6 yrs	38.9 yrs
Households	1,555	±121	1,315,707	129,227,496
Median household income	$71,179	±$9,265	$75,059	$80,734
Per capita income	$33,598	±$3,050	$40,877	$44,673
Poverty rate	14.2%	±6.7 pts	11.1%	12.5%
Unemployment rate	1.2%	±1.0 pts	3.6%	5.2%
Bachelor's degree or higher	19.9%	±5.2 pts	31.4%	35.7%
Median home value	$151,600	±$17,730	$208,000	$332,700
Median gross rent	$947/mo	±$270	$972/mo	$1,413/mo
Owner-occupied homes	75.3%	±5.6 pts	71.7%	65.2%
Mean travel time to work	18.3 min	±3.7 min	19.8 min	26.4 min
Worked from home	5.9%	±3.0 pts	11.3%	15.1%

Race and Hispanic or Latino origin

Shares of the total population by the Census Bureau's race and Hispanic or Latino origin categories (table B03002), listed in the Census Bureau's order. People self-identify on the survey.

Population by race and Hispanic or Latino origin, ZIP 51040
Group	ZIP 51040	Iowa	United States
White alone, not Hispanic or Latino	93.5%	82.3%	57.4%
Black or African American alone, not Hispanic or Latino	0.4%	3.8%	11.9%
American Indian and Alaska Native alone, not Hispanic or Latino	0.2%	0.2%	0.5%
Asian alone, not Hispanic or Latino	0.0%	2.5%	5.9%
Native Hawaiian and Other Pacific Islander alone, not Hispanic or Latino	0.0%	0.2%	0.2%
Some other race alone, not Hispanic or Latino	0.0%	0.3%	0.6%
Two or more races, not Hispanic or Latino	4.5%	3.5%	4.3%
Hispanic or Latino (of any race)	1.4%	7.3%	19.3%

Where ZIP 51040 is

State: Iowa
Main county: Monona County
Largest overlapping place: Onawa (4% of the ZIP's land area)
Land area: 129.51 sq mi· about 27 people per sq mi

County and place names come from the Census Bureau's 2020 ZCTA relationship files. A ZIP code's mailing city, set by the U.S. Postal Service, can differ from these names.

Other ZIP codes in Monona County

51010 Monona County, IA 51034 Monona County, IA 51051 Monona County, IA 51060 Monona County, IA 51063 Monona County, IA 51523 Monona County, IA 51558 Monona County, IA 51572 Monona County, IA

See every ZIP code in Iowa, or compare ZIP 51040 with another ZIP code.

Census figures describe residents as a group and cannot tell you about any one home or street. For a specific address, check local government and housing records.

About ZIP codes and ZCTAs: the Census Bureau publishes statistics for ZIP Code Tabulation Areas, which approximate USPS ZIP code delivery areas. Learn how they differ.

Sources

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, detailed tables B01003, B01002, B11001, B19013, B19301, B17001, B23025, B15003, B25077, B25064, B25003, B08013, B08303, B08301, B03002 — snapshot Oct 26, 2026.
U.S. Census Bureau, 2020 ZCTA5 relationship files (county and place).
Data: U.S. Census Bureau, American Community Survey 5-year estimates (detailed tables) and 2020 Census ZCTA relationship files. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau. These agencies do not endorse OpenZIP.