Zip code 51003: Alton, Iowa

Q: What city is zip code 51003?

51003 is assigned to Alton, Iowa. The city name is the one the Postal Service prefers for mail addressed to this zip code.

Q: What county is 51003 in?

51003 is in Sioux County, Iowa.

Q: What is the population of 51003?

About 1,938 people live in 51003, according to the Census Bureau's American Community Survey.

Q: What is the median household income in 51003?

The median household income in 51003 is $101,250.

Q: What zip codes are near 51003?

The closest zip codes to 51003 are 51041, 51022, 51238, 51036, 51045.

Residential delivery areaSioux CountyCentral Time

Population

1,938

Median household income

$101K

U.S. $81K

Median home value

$233K

U.S. $333K

Median rent

$813/mo

U.S. $1,413

Median age

37.1

U.S. 38.9

Land area

54 sq mi

36 people/sq mi

Boundary is the Census Bureau's ZIP Code Tabulation Area, which closely tracks the postal delivery area.

About 51003

51003 is a rural zip code in Alton, Iowa (Sioux County), covering 54 sq mi of land. About 1,938 people live here, or 36 per square mile. The median resident is 37.1 years old, compared with 38.9 nationally.

The median household earns $101,250 a year, 25% above the national median of $80,734. 2% of residents live below the poverty line (U.S.: 12.5%). A typical home is valued at $232,700, or 2.3 years of median household income (U.S.: 4.1 years), which makes homes relatively affordable for local earners. 87% of occupied homes are lived in by their owners, and renters pay a median of $813 a month.

29% of adults hold a bachelor's degree or higher (U.S.: 36%). Commuters average 21.1 minutes each way, and 5% of workers work from home. The most common jobs among working residents are in management; construction and repair; and healthcare.

How 51003 compares

Sorted from highest to lowest national percentile

Homeownership rate87.1%
92nd
StrengthU.S. 65.2% · IA 71.7%262nd of 909 in IA
Self-employed workers14.7%
89th
U.S. 10% · IA 10.2%394th of 911 in IA
Residents under 1826.2%
82nd
U.S. 22% · IA 22.9%241st of 911 in IA
Median household income$101,250
72nd
U.S. $80,734 · IA $75,05999th of 896 in IA
Healthcare workers10.4%
64th
U.S. 9.7% · IA 9.2%284th of 911 in IA
Government workers15.7%
64th
U.S. 14.5% · IA 14.5%297th of 911 in IA
Median earnings per worker$52,436
62nd
U.S. $49,666 · IA $47,712230th of 910 in IA
Per capita income$44,417
61st
U.S. $44,673 · IA $40,877219th of 911 in IA
Housing vacancy7.4%
56th
U.S. 10.1% · IA 8.5%550th of 909 in IA
Bachelor's degree or higher29.2%
44th
U.S. 35.7% · IA 31.4%186th of 911 in IA
Median age37.1
35th
U.S. 38.9 · IA 38.6737th of 911 in IA
Broadband access90.1%
35th
U.S. 91% · IA 88.9%364th of 909 in IA
Median home value$232,700
29th
U.S. $332,700 · IA $208,000167th of 881 in IA
Residents 65 and older12.6%
21st
U.S. 17.2% · IA 18.1%822nd of 911 in IA
Veterans3.4%
19th
U.S. 6.2% · IA 6.5%826th of 911 in IA
Average commute21.1 min
18th
StrengthU.S. 26.4 min · IA 19.8 min572nd of 902 in IA
Diversity index19.9
12th
U.S. 61.4 · IA 31.4255th of 911 in IA
Foreign-born residents1.8%
11th
U.S. 14.1% · IA 5.9%345th of 911 in IA
Median gross rent$813
8th
U.S. $1,413 · IA $972410th of 771 in IA
Work from home4.9%
7th
U.S. 15.1% · IA 11.3%707th of 911 in IA
Population density36/sq mi
5th
U.S. 95/sq mi · IA 58/sq mi296th of 911 in IA
Unemployment rate2%
5th
StrengthU.S. 5.2% · IA 3.6%491st of 911 in IA
Population1,938
3rd
U.S. 334,922,499 · IA 3,210,507288th of 911 in IA
Income inequality (Gini)0.356
3rd
StrengthU.S. 0.483 · IA 0.444679th of 908 in IA
Poverty rate2%
1st
StrengthU.S. 12.5% · IA 11.1%851st of 909 in IA
Uninsured rate1.1%
1st
StrengthU.S. 8.4% · IA 5%786th of 911 in IA
Rent-burdened renters11.9%
1st
StrengthU.S. 51.1% · IA 43.9%737th of 882 in IA
Tech workers0%
1st
U.S. 3.8% · IA 2.9%865th of 911 in IA

Measure	51003	Sioux	IA	U.S.	National percentile	Rank in IA
Homeownership rateStrength	87.1%	76.1%	71.7%	65.2%	92nd	262nd of 909
Self-employed workers	14.7%	16.6%	10.2%	10%	89th	394th of 911
Residents under 18	26.2%	27.2%	22.9%	22%	82nd	241st of 911
Median household income	$101,250	$86,098	$75,059	$80,734	72nd	99th of 896
Healthcare workers	10.4%	8.1%	9.2%	9.7%	64th	284th of 911
Government workers	15.7%	9.5%	14.5%	14.5%	64th	297th of 911
Median earnings per worker	$52,436	$45,574	$47,712	$49,666	62nd	230th of 910
Per capita income	$44,417	$37,166	$40,877	$44,673	61st	219th of 911
Housing vacancy	7.4%	4.5%	8.5%	10.1%	56th	550th of 909
Bachelor's degree or higher	29.2%	30.6%	31.4%	35.7%	44th	186th of 911
Median age	37.1	33.8	38.6	38.9	35th	737th of 911
Broadband access	90.1%	92.4%	88.9%	91%	35th	364th of 909
Median home value	$232,700	$250,100	$208,000	$332,700	29th	167th of 881
Residents 65 and older	12.6%	16.2%	18.1%	17.2%	21st	822nd of 911
Veterans	3.4%	3.7%	6.5%	6.2%	19th	826th of 911
Average commuteStrength	21.1 min	13.5 min	19.8 min	26.4 min	18th	572nd of 902
Diversity index	19.9	29.4	31.4	61.4	12th	255th of 911
Foreign-born residents	1.8%	8.5%	5.9%	14.1%	11th	345th of 911
Median gross rent	$813	$908	$972	$1,413	8th	410th of 771
Work from home	4.9%	12.8%	11.3%	15.1%	7th	707th of 911
Population density	36/sq mi	47/sq mi	58/sq mi	95/sq mi	5th	296th of 911
Unemployment rateStrength	2%	1.5%	3.6%	5.2%	5th	491st of 911
Population	1,938	36,212	3,210,507	334,922,499	3rd	288th of 911
Income inequality (Gini)Strength	0.356	0.409	0.444	0.483	3rd	679th of 908
Poverty rateStrength	2%	6.7%	11.1%	12.5%	1st	851st of 909
Uninsured rateStrength	1.1%	5.8%	5%	8.4%	1st	786th of 911
Rent-burdened rentersStrength	11.9%	30%	43.9%	51.1%	1st	737th of 882
Tech workers	0%	1.4%	2.9%	3.8%	1st	865th of 911

The percentile is the share of Americans who live in a zip code with a lower value, so the 50th percentile is typical. Rank 1 is the highest value in the state. Both include zip codes with at least 100 residents. Strengths and weaknesses mark measures in the best or worst fifth nationally, where higher or lower is clearly better (income, poverty, education, commute, broadband, insurance and similar). Measures like age or density are left unmarked.

People

Age

Under 5

21%

5–17

13%

18–24

25–34

15%

35–44

10%

45–54

14%

55–64

65–74

75+

Median age

37.1

Under 18

26.2%

65 and over

12.6%

Race and ethnicity

White89%
Black2%
Hispanic5%
Asian0.7%
Native American0%
Pacific Islander0%
Other0%
Multiracial3%

Diversity index

19.9

U.S. 61.4

Foreign-born

1.8%

U.S. 14.1%

Born in state

82.4%

Language spoken at home (households)

English only

93%

Spanish

Other Indo-European

Asian / Pacific

0.8%

Other

Households

Households: 730
Average household size: 2.7
Family households: 74.1%
Married couples: 67.3%
Living alone: 21.8%
Veterans (of adults): 3.4%
Male / female: 51% / 49%

Income and poverty

Household income distribution

<$25k

$25–50k

17%

$50–75k

10%

$75–100k

16%

$100–150k

26%

$150–200k

14%

$200k+

12%

Median household income

51003

$101,250

Sioux Co.

$86,098

Iowa

$75,059

United States

$80,734

Per capita income

$44,417

U.S. $44,673

Poverty rate

U.S. 12.5%

Households earning $150K+

25.8%

U.S. 23%

Income inequality (Gini)

0.356

U.S. 0.483

Housing

Median home value

51003

$232,700

Sioux Co.

$250,100

Iowa

$208,000

United States

$332,700

Median gross rent

51003

$813

Sioux Co.

$908

Iowa

$972

United States

$1,413

Types of housing

Single-family

88%

2–4 units

5–19 units

20+ units

Mobile home

Boat, RV, van

Housing units: 788
Owner-occupied: 87.1%
Vacant: 7.4%
Median year built: 1970
Median rooms: 7.1
Renters paying 30%+ of income: 11.9%
Renters paying 50%+ of income: 6.8%
Home value to income: 2.3× (U.S. 4.1×)

Work and commute

How people get to work

Drove alone

89%

Carpooled

Transit

0.3%

Walked

0.9%

Bicycle

0.2%

Worked from home

Other

0.2%

Commute time (one way)

<10 min

39%

10–19

24%

20–29

27%

30–44

45–59

60+

Average commute

21.1 min

U.S. 26.4 min

Unemployment

U.S. 5.2%

In labor force

79.5%

U.S. 63.5%

Jobs and careers

What employed residents do, wherever they work

Occupations

Management

14%

Construction and repair

13%

Healthcare

10%

Business and finance

Transportation and moving

Education

Legal and social services

Office and admin

Production

Cleaning and personal care

Food service

Farming, fishing and forestry

Sales

Engineering and science

Police and fire

0.6%

Computer and math

Arts, media and sports

Industries

Manufacturing

17%

Health care and social assistance

13%

Education

12%

Retail

Finance, insurance and real estate

Construction

Agriculture and mining

Transportation, warehousing and utilities

Public administration

Other services

Professional and technical services

Wholesale

Information

Restaurants and hotels

Arts and recreation

Admin, support and management

0.5%

Median earnings per worker

$52,436

U.S. $49,666

Self-employed

14.7%

U.S. 10%

Government workers

15.7%

U.S. 14.5%

Nonprofit workers

11%

U.S. 8.8%

Median earnings by type of work

Type of work	51003	U.S.
Management, business, science and arts	$62,262	$74,888
Service	$21,250	$26,804
Sales and office	$39,643	$40,476
Construction and maintenance	$59,223	$49,199
Production and transportation	$51,500	$39,989

Education, internet and health coverage

Highest education (adults 25+)

No diploma

High school

31%

Some college

23%

Associate's

15%

Bachelor's

24%

Graduate

High school graduate or higher: 97.4%
Bachelor's degree or higher: 29.2%
Graduate or professional degree: 5.3%
Households with broadband: 90.1%
Cable, fiber or DSL: 76.4%
No internet access: 6%
Without health insurance: 1.1%
Limited-English households: 1%

Geography

City (USPS): Alton
State: Iowa
County: Sioux County
Center point: 42.9896° N, 95.9860° W
Land area: 54 sq mi
Water area: under 0.1 sq mi
Time zone: Central Time (UTC-6, UTC-5 in summer)
Zip type: Residential delivery area

Cities and towns within this zip

Alton4% of zip

Census places overlapping the zip's area. Mail may use a different city name than the municipality.

Zip codes near 51003

Search by radius

Zip	City	Distance	Population	IncomeMedian income	Home value
51041	Orange City, IA	5.2 mi	7,324	$83,643	$277,000
51022	Granville, IA	7.1 mi	960	$96,505	$174,800
51238	Hospers, IA	7.5 mi	1,502	$74,000	$182,500
51036	Maurice, IA	10 mi	445	$122,841	$248,600
51045	Oyens, IA	12 mi	66	$113,750	$170,000
51250	Sioux Center, IA	13 mi	9,970	$94,119	$294,000
51050	Remsen, IA	13 mi	2,962	$92,500	$219,700
51234	Boyden, IA	14 mi	1,172	$84,318	$211,800
51201	Sheldon, IA	15 mi	6,430	$68,799	$197,800
51231	Archer, IA	15 mi	562	$108,058	$189,500
51046	Paullina, IA	16 mi	1,326	$84,125	$160,300
51031	Le Mars, IA	16 mi	12,808	$76,525	$222,800

Zip codes like 51003 elsewhere

Matched on income, home values, age, density, education, housing and commuting

Questions about 51003

What city is zip code 51003?

51003 is assigned to Alton, Iowa. The city name is the one the Postal Service prefers for mail addressed to this zip code.

What county is 51003 in?

51003 is in Sioux County, Iowa.

What is the population of 51003?

About 1,938 people live in 51003, according to the Census Bureau's American Community Survey.

What time zone is 51003 in?

51003 is in Central Time.

What is the median household income in 51003?

The median household income in 51003 is $101,250.

What zip codes are near 51003?

The closest zip codes to 51003 are 51041, 51022, 51238, 51036, 51045.

Demographic figures are 2020–2024 American Community Survey 5-year estimates for ZIP Code Tabulation Area 51003, from the U.S. Census Bureau. Small areas have wide margins of error. How we build these numbers.