51031 ZIP Code — Le Mars, IA
Plymouth County, Iowa
ZIP code 51031 is located in Le Mars, Iowa, within Plymouth County. It covers approximately 234.15 square miles and serves a population of 12,595 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 712.
About ZIP code 51031
The housing stock consists of a mix of housing types. Most homes were built in the pre-1940, giving the area an established character. Median home value is $190,300. Owner-occupancy sits near the national average at 70%.
Median household income is $75,540. The poverty rate of 6% is below the national average. 34% of households receive Social Security income, suggesting a notable retiree or disability population.
The dominant occupation class is management, business, and professional, with manufacturing as the leading industry. The average commute of 17 minutes is near the national average.
Educational attainment is near the national average, with 26% of residents holding a bachelor's degree or higher.
12,595
population
234.15
sq mi land
Standard
ZIP type
Central (CT)
timezone
51031 ZIP code map
Cities in ZIP code 51031
Below are the cities the US Postal Service accepts for ZIP code 51031. Using any city not on this list may result in mail delivery delays.
| City | Status |
|---|---|
| Le Mars | Acceptable |
| Le Mars | Preferred |
Nearby ZIP codes
51038 Merrill (6.6 mi)
51024 Hinton (12.2 mi)
51050 Remsen (12.9 mi)
51036 Maurice (13 mi)
51001 Akron (13.4 mi)
51027 Ireton (14.3 mi)
51028 Kingsley (17.1 mi)
51062 Westfield (17.1 mi)
51003 Alton (17.3 mi)
51108 Sioux City (17.6 mi)
51041 Orange City (17.7 mi)
51250 Sioux Center (19.6 mi)
Demographics
updated 05/2026
| Population | |
|---|---|
| Total population | 12,595 |
| Population density | 54 / sq mi |
| State FIPS | 19 |
| County FIPS | 149 |
| Geography | |
|---|---|
| Land area | 234.15 sq mi |
| Water area | 0.01 sq mi |
| Latitude | 42.7869 |
| Longitude | -96.2035 |
| Timezone | Central (CT) |
| Area code | 712 |
Total population by age
Gender
Race & ethnicity
Economics
updated 05/2026
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 33.2% | 34.9% | 40.1% |
| $50k – $100k | 37.7% | 35.2% | 33.4% |
| $100k – $200k | 25.0% | 25.5% | 21.5% |
| Over $200k | 4.2% | 4.3% | 5.0% |
Demographics & statistics
12,595
Population
54
People per sq mi
39.5
Median age
$75,540
Median household income
$38,839
Per capita income
$190,300
Median home value
$835
Median monthly rent
69.5%
Home ownership
6.3%
Poverty rate
2.2%
Unemployment
3,843
Housing units
25.8%
Bachelor's or higher
Age distribution
Male
Female
386
Under 5
379
474
5–9
464
463
10–14
453
423
15–19
414
372
20–24
365
720
25–34
705
792
35–44
776
826
45–54
809
354
55–59
346
442
60–64
432
630
65–74
617
253
75–84
248
228
85+
224
← Male
Female →
Age summary
| Group | Count | % |
|---|---|---|
| Under 18 | 3,210 | 25.5% |
| 18 and over | 9,385 | 74.5% |
| 65 and over | 2,200 | 17.5% |
| Median age | 39.5 years | |
Race & ethnicity
White
87.3%
Hispanic or Latino
3.9%
Black or African American
3%
Other race
2.7%
Two or more races
2.1%
Native Hawaiian / Pacific Islander
0.7%
Asian
0.2%
American Indian / Alaska Native
0.1%
| Group | Count | % |
|---|---|---|
| White | 11,436 | 87.3% |
| Hispanic or Latino | 506 | 3.9% |
| Black or African American | 392 | 3% |
| Other race | 351 | 2.7% |
| Two or more races | 281 | 2.1% |
| Native Hawaiian / Pacific Islander | 97 | 0.7% |
| Asian | 20 | 0.2% |
| American Indian / Alaska Native | 18 | 0.1% |
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 33.2% | 34.9% | 40.1% |
| $50k – $100k | 37.7% | 35.2% | 33.4% |
| $100k – $200k | 25.0% | 25.5% | 21.5% |
| Over $200k | 4.2% | 4.3% | 5.0% |
Under $10k
3.0%
$10k–$15k
3.2%
$15k–$25k
7.9%
$25k–$35k
4.9%
$35k–$50k
8.7%
$50k–$75k
21.7%
$75k–$100k
18.4%
$100k–$150k
17.3%
$150k–$200k
7.0%
$200k+
7.8%
| Range | % of households |
|---|---|
| Under $10k | 3.0% |
| $10k–$15k | 3.2% |
| $15k–$25k | 7.9% |
| $25k–$35k | 4.9% |
| $35k–$50k | 8.7% |
| $50k–$75k | 21.7% |
| $75k–$100k | 18.4% |
| $100k–$150k | 17.3% |
| $150k–$200k | 7.0% |
| $200k+ | 7.8% |
| Median income | $75,540 |
Housing
Home values
Under $50k
7.0%
$50k–$100k
7.0%
$100k–$150k
16.5%
$150k–$200k
24.3%
$200k–$300k
20.9%
$300k–$500k
21.1%
$500k–$1M
3.1%
Housing overview
| Metric | Value |
|---|---|
| Median home value | $190,300 |
| Median rent / month | $835 |
| Owner occupied | 69.5% |
| Renter occupied | 30.5% |
| Vacant | 5.2% |
| Single-family detached | 67.9% |
| Large apartment buildings | 3.1% |
| Mobile homes | 6.5% |
| Median rooms | 6.0 |
| Avg household size (owned) | 2.70 |
Year built
| Era | % |
|---|---|
| 2020 or later | 0.5% |
| 2010–2019 | 7.2% |
| 2000–2009 | 8.1% |
| 1990–1999 | 12.7% |
| 1980–1989 | 7.3% |
| 1970–1979 | 19.0% |
| 1960–1969 | 9.5% |
| 1950–1959 | 8.2% |
| 1940–1949 | 3.1% |
| 1939 or earlier | 24.2% |
Bedrooms
| Size | % of units |
|---|---|
| No bedroom (studio) | 1.3% |
| 1 bedroom | 6.4% |
| 2 bedrooms | 30.9% |
| 3 bedrooms | 32.1% |
| 4 bedrooms | 21.0% |
| 5+ bedrooms | 8.3% |
Vehicles per household
| Vehicles | % of households |
|---|---|
| No vehicle | 5.0% |
| 1 vehicle | 29.4% |
| 2 vehicles | 40.8% |
| 3 or more | 24.9% |
Heating fuel
| Fuel type | % |
|---|---|
| Utility gas | 55.0% |
| Electricity | 33.3% |
| Propane / LP gas | 9.9% |
| Fuel oil | 0.8% |
| Solar | 0.1% |
| No fuel used | 0.2% |
Households & families
| Household type | Count | % |
|---|---|---|
| Married-couple family | 2,871 | 56.0% |
| Cohabiting couple | 186 | 3.6% |
| Male householder, no spouse | 928 | 18.1% |
| Female householder, no spouse | 1,143 | 22.3% |
| Households with children under 18 | 1,691 | 33.0% |
| Households with seniors (65+) | 1,636 | 31.9% |
| Average household size | 2.42 | |
Marital status
| Status | Male | Female |
|---|---|---|
| Never married | 30.1% | 19.6% |
| Married | 59.9% | 60.0% |
| Separated | 0.8% | 1.0% |
| Widowed | 3.0% | 10.8% |
| Divorced | 6.3% | 8.6% |
Education
Less than 9th grade
3.2%
Some HS, no diploma
1.9%
HS graduate
35.1%
Some college, no degree
19.5%
Associate's degree
14.5%
Bachelor's degree
18.7%
Graduate / professional
7.0%
| Metric | % |
|---|---|
| HS diploma or higher | 94.9% |
| Bachelor's or higher | 25.8% |
School enrollment (ages 3–17)
| Type | Count | % |
|---|---|---|
| Nursery / preschool | 352 | 11.4% |
| Kindergarten | 361 | 11.6% |
| Elementary school | 1,170 | 37.8% |
| High school | 798 | 25.8% |
| College / grad school | 418 | 13.5% |
Employment
Industry of employment
Manufacturing
24.1%
Education & healthcare
19.3%
Retail trade
8.7%
Transportation & utilities
8.5%
Agriculture & mining
6.8%
Professional & management
5.5%
Finance & real estate
5.2%
Other services
5.2%
Construction
4.5%
Arts, food & hospitality
4.2%
Public administration
3.6%
Wholesale trade
2.5%
Information
1.8%
Occupation
| Category | % |
|---|---|
| Management, business & arts | 33.1% |
| Service | 14.6% |
| Sales & office | 18.2% |
| Natural resources & construction | 12.4% |
| Production & transportation | 21.7% |
Employment type
| Type | % |
|---|---|
| Private sector | 83.2% |
| Government | 11.5% |
| Self-employed | 5.3% |
| Unpaid family workers | 0.0% |
Commute
| Method | % |
|---|---|
| Drive alone | 80.0% |
| Carpool | 9.7% |
| Public transit | 0.0% |
| Walk | 3.7% |
| Work from home | 5.7% |
| Other means | 0.9% |
| Avg commute (minutes) | 16.5 |
Poverty
All people
6.3%
Under 18 years
6.0%
18 and over
6.4%
Married-couple families
2.3%
Female-led households
13.3%
Income support
| Source | % of households |
|---|---|
| Social Security | 34.1% |
| Retirement income | 19.6% |
| Supplemental Security | 4.0% |
| Cash public assistance | 2.2% |
| Food stamps / SNAP | 6.0% |
Health indicators
| Condition | % |
|---|---|
| Obesity | 33.4% |
| High blood pressure | 32.9% |
| High cholesterol | 32.1% |
| Diabetes | 9.3% |
| Heart disease | 6.4% |
| Stroke | 2.9% |
| Asthma | 9.2% |
| Arthritis | 23.3% |
| Kidney disease | 2.8% |
| Pulmonary disease | 6.4% |
| Cancer | 7.2% |
| Behavior / access | % |
|---|---|
| Smoking | 16.6% |
| Binge drinking | 20.9% |
| No physical activity | 23.2% |
| Less than 7 hrs sleep | 28.0% |
| Depression | 17.1% |
| Fair or poor health | 12.1% |
| Poor mental health | 12.9% |
| Poor physical health | 9.2% |
| No health insurance | 9.3% |
| Visited doctor (checkup) | 74.8% |
| Visited dentist | 69.6% |
| Cholesterol screening | 88.6% |
| Teeth loss | 12.0% |
Veterans & disability
| Veterans | Count | % |
|---|---|---|
| Civilian veterans | 724 | 7.7% |
| Disability | % |
|---|---|
| Any disability | 13.4% |
| Under 18 | 1.5% |
| 18–64 years | 10.9% |
| 65 and over | 40.2% |
Health insurance coverage
| Type | % |
|---|---|
| Private insurance | 78.6% |
| Public insurance | 29.7% |
| No insurance | 6.1% |
| Uninsured under 19 | 6.1% |
Language & origin
Language spoken at home (age 5+)
| Language | Count | % |
|---|---|---|
| English only | 11,830 | 93.9% |
| Spanish | 697 | 5.9% |
| Other Indo-European | 519 | 4.4% |
| Asian & Pacific Islander | 16 | 0.1% |
| Other languages | 42 | 0.4% |
Place of birth & citizenship
| Origin | Count | % |
|---|---|---|
| Native born (US) | 11,796 | 93.7% |
| Born in same state | 11,629 | 92.3% |
| Born in different state | 9,117 | 72.4% |
| Foreign born | 167 | 1.3% |
| Naturalized citizen | 799 | 6.3% |
| Not a US citizen | 256 | 32.0% |
Ancestry
| Ancestry | Count | % |
|---|---|---|
| Italian | 1,495 | 11.9% |
| English | 948 | 7.5% |
| French | 617 | 4.9% |
| Ancestry | Count | % |
|---|---|---|
| Arab | 460 | 3.7% |
| Polish | 403 | 3.2% |
| Dutch | 80 | 0.6% |
Technology access
| Metric | % of households |
|---|---|
| Computer access | 40.7% |
| Internet access | 92.7% |
Source: U.S. Census Bureau, American Community Survey 2025 estimates.
Frequently asked questions about ZIP code 51031
What city is ZIP code 51031 in?
ZIP code 51031 is primarily assigned to Le Mars, Iowa.
What county is ZIP code 51031 in?
ZIP code 51031 falls within Plymouth County, Iowa.
What is the typical home value in ZIP code 51031?
The median home value in ZIP code 51031 is $190,300.
What is the population of ZIP code 51031?
ZIP code 51031 has an estimated population of 12,595 residents, with a density of 54 people per square mile.
What is the median household income in ZIP code 51031?
The median household income in ZIP code 51031 is $75,540, above the national median of ~$75,000.
What timezone is ZIP code 51031 in?
ZIP code 51031 observes the CST timezone.