Castlewood ZIP Codes — Hamlin County, SD

There is one unique ZIP code in Castlewood, South Dakota and it is 57223. Area code: 605.

ZIP codes

124.64

sq mi land

3.18

sq mi water

605

area code

Castlewood, SD ZIP code map

About Castlewood, SD

Castlewood is a charming city located in Hamlin County, South Dakota. With its small-town atmosphere and close-knit community, it offers a unique blend of rural charm and local hospitality. Residents enjoy the scenic beauty and tranquility that this area provides.

Location & geography

Castlewood is situated in the northeastern part of South Dakota, conveniently located near several key cities. The city lies approximately 10 miles southwest of Watertown, 30 miles west of Brookings, 35 miles northwest of Sioux Falls, and 25 miles northeast of Brookings. Covering a total land area of 124.64 square miles, Castlewood also includes 3.18 square miles of water, contributing to its picturesque landscape.

Community & economy

The character of Castlewood is defined by its friendly residents and active community involvement, making it a great place to live and raise a family. Local industries primarily include agriculture and small businesses, which are vital to the town's economy. Daily life in Castlewood centers around community events, local schools, and recreational activities that foster a sense of belonging among its residents.

Transportation

Castlewood is accessible via South Dakota Highway 25, which runs through the city, providing convenient connections to nearby towns. The nearest major airport is Watertown Regional Airport, located about 12 miles to the north. Public transportation options are limited, but the community's small size makes travel straightforward for residents.

History

Castlewood was founded in the late 19th century and has a rich history rooted in agriculture and local commerce. The town played a significant role as a service hub for surrounding rural areas and developed a strong sense of community over the years. Noteworthy events include the annual fairs that celebrate local culture and heritage, drawing visitors and residents alike.

Did you know?

One surprising fact about Castlewood is its commitment to preserving the charm of small-town America amidst modern developments. Additionally, the city boasts a community center that hosts various events throughout the year, enhancing the social fabric of the town.

ZIP codes for Castlewood, SD (1)

ZIP code	City	County	Map
57223	Castlewood	Hamlin	View map

Demographics & statistics

1,317

Population

36.1

Median age

$83,295

Median household income

$34,798

Per capita income

$205,600

Median home value

$885

Median monthly rent

86.2%

Home ownership

3.2%

Poverty rate

0.9%

Unemployment

469

Housing units

23.0%

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	410	31.1%
18 and over	907	68.9%
65 and over	190	14.4%
Median age	36.1 years

Race & ethnicity

White 95.4%

Two or more races 2.6%

Hispanic or Latino 1%

Other race 0.6%

Asian 0.3%

Black or African American 0.2%

Group	Count	%
White	1,269	95.4%
Two or more races	34	2.6%
Hispanic or Latino	13	1%
Other race	8	0.6%
Asian	4	0.3%
Black or African American	2	0.2%

Household income

Under $10k 1.0%

$10k–$15k 3.0%

$15k–$25k 7.1%

$25k–$35k 6.1%

$35k–$50k 10.3%

$50k–$75k 15.2%

$75k–$100k 22.7%

$100k–$150k 22.9%

$150k–$200k 6.1%

$200k+ 5.7%

Range	% of households
Under $10k	1.0%
$10k–$15k	3.0%
$15k–$25k	7.1%
$25k–$35k	6.1%
$35k–$50k	10.3%
$50k–$75k	15.2%
$75k–$100k	22.7%
$100k–$150k	22.9%
$150k–$200k	6.1%
$200k+	5.7%
Median income	$83,295

Housing

Home values

Under $50k 3.8%

$50k–$100k 9.4%

$100k–$150k 11.3%

$150k–$200k 23.9%

$200k–$300k 28.2%

$300k–$500k 20.4%

$500k–$1M 3.1%

Housing overview

Metric	Value
Median home value	$205,600
Median rent / month	$885
Owner occupied	86.2%
Renter occupied	13.8%
Vacant	8.0%
Single-family detached	89.6%
Large apartment buildings	0.6%
Mobile homes	3.5%
Median rooms	6.9
Avg household size (owned)	2.78

Year built

Era	%
2020 or later	0.0%
2010–2019	11.0%
2000–2009	11.5%
1990–1999	8.9%
1980–1989	7.1%
1970–1979	19.0%
1960–1969	4.3%
1950–1959	6.7%
1940–1949	2.6%
1939 or earlier	28.9%

Bedrooms

Size	% of units
No bedroom (studio)	2.0%
1 bedroom	2.8%
2 bedrooms	20.5%
3 bedrooms	35.0%
4 bedrooms	28.3%
5+ bedrooms	11.4%

Vehicles per household

Vehicles	% of households
No vehicle	1.0%
1 vehicle	14.6%
2 vehicles	37.4%
3 or more	47.0%

Heating fuel

Fuel type	%
Utility gas	41.7%
Electricity	34.6%
Propane / LP gas	20.2%
Fuel oil	1.6%
Wood	0.6%
No fuel used	0.6%

Households & families

Household type	Count	%
Married-couple family	312	63.2%
Cohabiting couple	11	2.2%
Male householder, no spouse	87	17.6%
Female householder, no spouse	84	17.0%
Households with children under 18	172	34.8%
Households with seniors (65+)	126	25.5%
Average household size	2.67

Marital status

Status	Male	Female
Never married	27.1%	15.1%
Married	63.4%	66.3%
Separated	1.5%	0.0%
Widowed	0.0%	4.7%
Divorced	7.9%	14.0%

Education

Less than 9th grade 1.0%

Some HS, no diploma 1.1%

HS graduate 38.0%

Some college, no degree 21.0%

Associate's degree 16.0%

Bachelor's degree 18.6%

Graduate / professional 4.4%

Metric	%
HS diploma or higher	98.0%
Bachelor's or higher	23.0%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	29	8.7%
Kindergarten	26	7.8%
Elementary school	168	50.5%
High school	72	21.6%
College / grad school	38	11.4%

Employment

Industry of employment

Education & healthcare 21.6%

Manufacturing 16.1%

Agriculture & mining 11.1%

Other services 9.6%

Retail trade 7.5%

Professional & management 7.4%

Transportation & utilities 6.6%

Wholesale trade 5.9%

Construction 5.2%

Finance & real estate 3.3%

Public administration 2.6%

Arts, food & hospitality 2.3%

Information 1.0%

Occupation

Category	%
Management, business & arts	38.7%
Service	11.2%
Sales & office	18.9%
Natural resources & construction	12.6%
Production & transportation	18.7%

Employment type

Type	%
Private sector	70.5%
Government	14.2%
Self-employed	15.3%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	77.1%
Carpool	12.4%
Public transit	0.0%
Walk	2.5%
Other means	0.0%
Avg commute (minutes)	19.8

Poverty

All people 3.2%

Under 18 years 2.2%

18 and over 3.6%

Married-couple families 0.6%

Female-led households 3.7%

Income support

Source	% of households
Social Security	23.5%
Retirement income	15.4%
Supplemental Security	2.6%
Cash public assistance	0.4%
Food stamps / SNAP	1.4%

Health indicators

Condition	%
High blood pressure	28.8%
High cholesterol	30.8%
Heart disease	6.1%
Stroke	2.8%
Asthma	8.5%
Arthritis	22.4%
Kidney disease	2.6%
Pulmonary disease	5.5%
Cancer	7.0%

Behavior / access	%
Binge drinking	20.2%
No physical activity	21.1%
Less than 7 hrs sleep	27.3%
Fair or poor health	10.3%
Poor mental health	10.5%
Poor physical health	8.2%
No health insurance	11.8%
Visited doctor (checkup)	71.9%
Visited dentist	68.6%
Cholesterol screening	89.1%
Teeth loss	12.4%

Veterans & disability

Veterans	Count	%
Civilian veterans	70	7.7%

Disability	%
Any disability	9.1%
Under 18	3.2%
18–64 years	4.5%
65 and over	38.9%

Health insurance coverage

Type	%
Private insurance	78.3%
Public insurance	21.3%
Uninsured under 19	14.8%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	1,215	92.3%
Spanish	5	0.4%
Other Indo-European	5	0.4%
Asian & Pacific Islander	0	0.0%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	1,308	99.3%
Born in same state	1,300	98.7%
Born in different state	982	74.6%
Foreign born	8	0.6%
Naturalized citizen	9	0.7%
Not a US citizen	1	11.1%

Ancestry

Ancestry	Count	%
English	153	11.6%
Polish	146	11.1%
Arab	81	6.2%
Italian	71	5.4%

Ancestry	Count	%
French	48	3.6%
Dutch	27	2.1%
German	3	0.2%

Technology access

Metric	% of households
Computer access	37.5%
Internet access	92.7%

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

Frequently asked questions

What ZIP codes does Castlewood, SD have?

Castlewood, SD has one ZIP code: 57223. Each ZIP code serves a distinct delivery area within the city and surrounding region.