57433 ZIP Code — Columbia, SD

Brown County, South Dakota

ZIP code 57433 is located in Columbia, South Dakota, within Brown County. It covers approximately 121.37 square miles and serves a population of 355 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 605.

About ZIP code 57433

The housing stock consists of predominantly single-family detached homes. Most homes were built in the pre-1940, giving the area an established character. Median home value is $153,000. Owner-occupancy is high at 94%, well above the national average.

Median household income is $74,167. 43% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with agriculture and mining as the leading industry. The average commute of 19 minutes is near the national average.

Educational attainment is near the national average, with 21% of residents holding a bachelor's degree or higher.

Overall, ZIP code 57433 reflects a community defined by high homeownership and a significant Social Security-dependent population.

355

population

121.37

sq mi land

Standard

ZIP type

Central (CT)

timezone

57433 ZIP code map

Cities in ZIP code 57433

Below are the cities the US Postal Service accepts for ZIP code 57433. Using any city not on this list may result in mail delivery delays.

City	Status
Columbia	Acceptable
Columbia	Preferred

Nearby ZIP codes

57427 Bath (10.1 mi) 57432 Claremont (13.7 mi) 57445 Groton (13.9 mi) 57401 Aberdeen (16 mi) 57441 Frederick (16.1 mi) 57446 Hecla (16.7 mi) 57481 Westport (17.3 mi)

Demographics updated 05/2026

Population
Total population	355
Population density	3 / sq mi
State FIPS	46
County FIPS	013

Geography
Land area	121.37 sq mi
Water area	4.08 sq mi
Latitude	45.6324
Longitude	-98.2951
Timezone	Central (CT)
Area code	605

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	28.6%	39.9%	41.7%
$50k – $100k	39.7%	34.8%	33.8%
$100k – $200k	30.7%	20.4%	20.1%
Over $200k	1.0%	4.9%	4.4%

Demographics & statistics

355

Population

People per sq mi

46.9

Median age

$74,167

Median household income

$44,072

Per capita income

$153,000

Median home value

$1,021

Median monthly rent

93.6%

Home ownership

0.6%

Poverty rate

0.0%

Unemployment

161

Housing units

21.0%

Bachelor's or higher

Age distribution

Male Female

Under 5

5–9

10–14

15–19

20–24

25–34

35–44

45–54

55–59

60–64

65–74

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	78	22.0%
18 and over	277	78.0%
65 and over	123	34.6%
Median age	46.9 years

Race & ethnicity

White 99.7%

American Indian / Alaska Native 0.3%

Group	Count	%
White	354	99.7%
American Indian / Alaska Native	1	0.3%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	28.6%	39.9%	41.7%
$50k – $100k	39.7%	34.8%	33.8%
$100k – $200k	30.7%	20.4%	20.1%
Over $200k	1.0%	4.9%	4.4%

$10k–$15k 1.2%

$15k–$25k 2.3%

$25k–$35k 9.3%

$35k–$50k 7.0%

$50k–$75k 32.6%

$75k–$100k 24.4%

$100k–$150k 4.1%

$150k–$200k 15.1%

$200k+ 4.1%

Range	% of households
$10k–$15k	1.2%
$15k–$25k	2.3%
$25k–$35k	9.3%
$35k–$50k	7.0%
$50k–$75k	32.6%
$75k–$100k	24.4%
$100k–$150k	4.1%
$150k–$200k	15.1%
$200k+	4.1%
Median income	$74,167

Housing

Home values

Under $50k 29.2%

$50k–$100k 9.3%

$100k–$150k 9.3%

$150k–$200k 21.7%

$200k–$300k 25.5%

$300k–$500k 0.6%

$500k–$1M 1.2%

$1M+ 3.1%

Housing overview

Metric	Value
Median home value	$153,000
Median rent / month	$1,021
Owner occupied	93.6%
Renter occupied	6.4%
Vacant	0.0%
Single-family detached	77.3%
Large apartment buildings	0.0%
Mobile homes	18.6%
Median rooms	6.0
Avg household size (owned)	2.01

Year built

Era	%
2020 or later	0.0%
2010–2019	3.5%
2000–2009	21.5%
1990–1999	11.6%
1980–1989	2.3%
1970–1979	16.3%
1960–1969	0.6%
1950–1959	0.6%
1940–1949	15.7%
1939 or earlier	27.9%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	4.1%
2 bedrooms	8.7%
3 bedrooms	41.3%
4 bedrooms	19.2%
5+ bedrooms	26.7%

Vehicles per household

Vehicles	% of households
No vehicle	0.0%
1 vehicle	19.8%
2 vehicles	54.1%
3 or more	26.2%

Heating fuel

Fuel type	%
Utility gas	1.2%
Electricity	38.4%
Propane / LP gas	58.1%
Fuel oil	1.2%

Households & families

Household type	Count	%
Married-couple family	79	45.9%
Cohabiting couple	6	3.5%
Male householder, no spouse	52	30.2%
Female householder, no spouse	35	20.3%
Households with children under 18	37	21.5%
Households with seniors (65+)	68	39.5%
Average household size	2.06

Marital status

Status	Male	Female
Never married	41.9%	14.3%
Married	50.0%	60.3%
Separated	5.0%	0.0%
Widowed	0.6%	6.3%
Divorced	2.5%	19.0%

Education

Less than 9th grade 6.5%

Some HS, no diploma 2.3%

HS graduate 38.5%

Some college, no degree 21.8%

Associate's degree 9.9%

Bachelor's degree 16.4%

Graduate / professional 4.6%

Metric	%
HS diploma or higher	91.2%
Bachelor's or higher	21.0%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	0	0.0%
Kindergarten	2	2.9%
Elementary school	50	73.5%
High school	16	23.5%
College / grad school	0	0.0%

Employment

Industry of employment

Agriculture & mining 29.9%

Other services 18.3%

Education & healthcare 15.7%

Arts, food & hospitality 8.6%

Construction 8.1%

Professional & management 7.6%

Transportation & utilities 4.1%

Manufacturing 2.5%

Finance & real estate 2.5%

Wholesale trade 1.5%

Public administration 1.0%

Occupation

Category	%
Management, business & arts	38.1%
Service	22.3%
Sales & office	3.6%
Natural resources & construction	27.9%
Production & transportation	8.1%

Employment type

Type	%
Private sector	60.4%
Government	7.1%
Self-employed	32.5%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	66.5%
Carpool	1.0%
Public transit	0.0%
Walk	21.3%
Work from home	11.2%
Other means	0.0%
Avg commute (minutes)	18.8

Poverty

All people 0.6%

Under 18 years 0.0%

18 and over 0.7%

Married-couple families 0.0%

Female-led households 0.0%

Income support

Source	% of households
Social Security	43.0%
Retirement income	29.1%
Supplemental Security	1.7%
Cash public assistance	2.9%
Food stamps / SNAP	9.3%

Health indicators

Condition	%
Obesity	32.9%
High blood pressure	36.1%
High cholesterol	35.8%
Diabetes	10.2%
Heart disease	7.4%
Stroke	3.1%
Asthma	7.8%
Arthritis	27.7%
Kidney disease	3.0%
Pulmonary disease	5.9%
Cancer	8.2%

Behavior / access	%
Smoking	16.9%
Binge drinking	18.9%
No physical activity	23.0%
Less than 7 hrs sleep	28.4%
Depression	14.9%
Fair or poor health	10.7%
Poor mental health	9.4%
Poor physical health	8.6%
No health insurance	10.7%
Visited doctor (checkup)	76.6%
Visited dentist	70.3%
Cholesterol screening	91.2%
Teeth loss	11.8%

Veterans & disability

Veterans	Count	%
Civilian veterans	28	10.1%

Disability	%
Any disability	6.8%
Under 18	3.8%
18–64 years	1.3%
65 and over	15.4%

Health insurance coverage

Type	%
Private insurance	84.5%
Public insurance	42.8%
No insurance	4.5%
Uninsured under 19	5.9%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	338	95.2%
Spanish	0	0.0%
Other Indo-European	0	0.0%
Asian & Pacific Islander	0	0.0%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	355	100.0%
Born in same state	355	100.0%
Born in different state	272	76.6%
Foreign born	0	0.0%
Naturalized citizen	0	0.0%
Not a US citizen	0	0.0%

Ancestry

Ancestry	Count	%
Polish	77	21.7%
French	37	10.4%
Italian	19	5.4%

Ancestry	Count	%
Dutch	10	2.8%
English	5	1.4%
Irish	3	0.8%

Technology access

Metric	% of households
Computer access	48.5%
Internet access	91.9%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions about ZIP code 57433

What city is ZIP code 57433 in?

ZIP code 57433 is primarily assigned to Columbia, South Dakota.

What county is ZIP code 57433 in?

ZIP code 57433 falls within Brown County, South Dakota.

Does ZIP code 57433 have an older population?

35% of residents in ZIP code 57433 are 65 or older, above the national average of ~17%.

Is ZIP code 57433 mostly owner-occupied?

94% of occupied units in ZIP code 57433 are owner-occupied, well above the national average.

Does ZIP code 57433 have a large retiree population?

43% of households in ZIP code 57433 receive Social Security income, suggesting a significant retiree or disability population.

What is the typical home value in ZIP code 57433?

The median home value in ZIP code 57433 is $153,000.

What timezone is ZIP code 57433 in?

ZIP code 57433 observes the CST timezone.