Green Castle ZIP Code List — Sullivan County, MO

There is one unique ZIP code in Green Castle, Missouri and it is 63544. Area code: 660.

ZIP codes

138.88

sq mi land

0.20

sq mi water

660

area code

Green Castle, MO ZIP code map

About Green Castle, MO

Green Castle, Missouri, is a quaint city located in Sullivan County. Known for its rural charm, Green Castle provides a peaceful environment for its residents. The city is accessible and serves as a lovely spot for those looking to experience the simplicity of life in small-town America.

Location & geography

Geographically, Green Castle spans a land area of 138.88 square miles and has a small water area of 0.20 square miles. It is situated within the central part of Missouri, with neighboring cities like Unionville, which is approximately 18 miles to the northeast, and Milan, located about 20 miles to the west. The surrounding terrain predominantly consists of rolling hills and agricultural land, contributing to its picturesque landscape.

Community & economy

The community in Green Castle has a tight-knit, friendly character, making it an inviting place for families and individuals alike. Agriculture plays a significant role in the local economy, with many residents engaged in farming and related industries. Daily life here reflects a slower pace, with a focus on community events, local gatherings, and outdoor activities.

Transportation

Transportation options in and around Green Castle are primarily via local roads and highways, with Highway 136 being a key thoroughfare. The nearest major airport is Kirksville Regional Airport, located about 35 miles to the southeast, providing essential connectivity to larger urban areas.

History

Green Castle was founded in the early 19th century, primarily as a farming community that supported nearby agricultural needs. Over the years, key industries have included agriculture and small businesses that reflect the community's values and lifestyle. While there may not be many notable events that have transpired, the city's foundation has always been centered around its agricultural roots.

Did you know?

One surprising fact about Green Castle is that it is home to a mix of agricultural and residential areas that reflect its rural lifestyle while maintaining community spirit. Another interesting point is the city's unique ZIP code, 63544, which is shared by only one other community in the area.

ZIP codes for Green Castle, MO (1)

ZIP code	City	County	Map
63544	Green Castle	Sullivan	View map

Demographics & statistics

1,071

Population

55.0

Median age

$42,768

Median household income

$21,816

Per capita income

$114,600

Median home value

$438

Median monthly rent

86.3%

Home ownership

7.6%

Poverty rate

0.5%

Unemployment

442

Housing units

15.0%

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

116

60–64

65–74

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	156	14.6%
18 and over	915	85.4%
65 and over	257	24.0%
Median age	55.0 years

Race & ethnicity

White 94.9%

Two or more races 3%

American Indian / Alaska Native 1%

Asian 0.7%

Black or African American 0.5%

Group	Count	%
White	1,016	94.9%
Two or more races	32	3%
American Indian / Alaska Native	11	1%
Asian	7	0.7%
Black or African American	5	0.5%

Household income

Under $10k 3.2%

$10k–$15k 8.7%

$15k–$25k 14.7%

$25k–$35k 12.7%

$35k–$50k 16.0%

$50k–$75k 21.7%

$75k–$100k 11.2%

$100k–$150k 10.2%

$150k–$200k 1.0%

$200k+ 0.5%

Range	% of households
Under $10k	3.2%
$10k–$15k	8.7%
$15k–$25k	14.7%
$25k–$35k	12.7%
$35k–$50k	16.0%
$50k–$75k	21.7%
$75k–$100k	11.2%
$100k–$150k	10.2%
$150k–$200k	1.0%
$200k+	0.5%
Median income	$42,768

Housing

Home values

Under $50k 28.3%

$50k–$100k 17.6%

$100k–$150k 12.7%

$150k–$200k 16.8%

$200k–$300k 15.9%

$300k–$500k 3.8%

$500k–$1M 4.0%

$1M+ 0.9%

Housing overview

Metric	Value
Median home value	$114,600
Median rent / month	$438
Owner occupied	86.3%
Renter occupied	13.7%
Vacant	19.3%
Single-family detached	72.4%
Large apartment buildings	1.4%
Mobile homes	23.1%
Median rooms	5.9
Avg household size (owned)	2.78

Year built

Era	%
2020 or later	1.8%
2010–2019	6.4%
2000–2009	11.1%
1990–1999	15.1%
1980–1989	5.0%
1970–1979	21.5%
1960–1969	8.7%
1950–1959	5.4%
1940–1949	6.0%
1939 or earlier	18.9%

Bedrooms

Size	% of units
No bedroom (studio)	4.2%
1 bedroom	7.2%
2 bedrooms	34.0%
3 bedrooms	43.5%
4 bedrooms	10.5%
5+ bedrooms	0.6%

Vehicles per household

Vehicles	% of households
No vehicle	9.5%
1 vehicle	24.4%
2 vehicles	36.7%
3 or more	29.4%

Heating fuel

Fuel type	%
Utility gas	1.7%
Electricity	35.9%
Propane / LP gas	47.4%
Fuel oil	1.2%
Wood	12.5%
No fuel used	1.2%

Households & families

Household type	Count	%
Married-couple family	192	47.9%
Cohabiting couple	21	5.2%
Male householder, no spouse	78	19.5%
Female householder, no spouse	110	27.4%
Households with children under 18	59	14.7%
Households with seniors (65+)	169	42.1%
Average household size	2.67

Marital status

Status	Male	Female
Never married	23.6%	25.5%
Married	42.8%	43.2%
Separated	0.0%	5.3%
Widowed	17.6%	14.1%
Divorced	16.0%	12.0%

Education

Less than 9th grade 3.9%

Some HS, no diploma 5.9%

HS graduate 58.4%

Some college, no degree 11.2%

Associate's degree 5.6%

Bachelor's degree 9.7%

Graduate / professional 5.2%

Metric	%
HS diploma or higher	90.1%
Bachelor's or higher	15.0%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	8	4.6%
Kindergarten	9	5.2%
Elementary school	83	47.7%
High school	30	17.2%
College / grad school	44	25.3%

Employment

Industry of employment

Agriculture & mining 26.7%

Education & healthcare 21.6%

Retail trade 13.8%

Manufacturing 10.1%

Professional & management 6.0%

Other services 5.5%

Construction 4.8%

Public administration 2.8%

Transportation & utilities 2.5%

Information 2.5%

Arts, food & hospitality 1.8%

Wholesale trade 1.6%

Finance & real estate 0.2%

Occupation

Category	%
Management, business & arts	44.1%
Service	13.3%
Sales & office	13.3%
Natural resources & construction	15.2%
Production & transportation	14.0%

Employment type

Type	%
Private sector	61.8%
Government	7.1%
Self-employed	31.0%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	75.1%
Carpool	13.6%
Public transit	0.0%
Walk	2.5%
Other means	0.9%
Avg commute (minutes)	30.2

Poverty

All people 7.6%

Under 18 years 7.1%

18 and over 7.7%

Married-couple families 3.6%

Female-led households 4.4%

Income support

Source	% of households
Social Security	51.6%
Retirement income	25.2%
Supplemental Security	11.7%
Cash public assistance	0.5%
Food stamps / SNAP	5.0%

Health indicators

Condition	%
High blood pressure	36.8%
High cholesterol	38.4%
Heart disease	9.1%
Stroke	4.1%
Asthma	9.5%
Arthritis	32.5%
Kidney disease	3.6%
Pulmonary disease	10.4%
Cancer	8.3%

Behavior / access	%
Binge drinking	15.2%
No physical activity	29.4%
Less than 7 hrs sleep	31.8%
Fair or poor health	18.8%
Poor mental health	15.0%
Poor physical health	13.4%
No health insurance	15.9%
Visited doctor (checkup)	76.0%
Visited dentist	56.5%
Cholesterol screening	89.9%
Teeth loss	19.9%

Veterans & disability

Veterans	Count	%
Civilian veterans	74	8.1%

Disability	%
Any disability	24.0%
Under 18	2.6%
18–64 years	14.6%
65 and over	61.1%

Health insurance coverage

Type	%
Private insurance	69.0%
Public insurance	41.4%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	1,027	95.9%
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)	1,057	98.7%
Born in same state	1,032	96.4%
Born in different state	636	59.4%
Foreign born	25	2.3%
Naturalized citizen	14	1.3%
Not a US citizen	0	0.0%

Ancestry

Ancestry	Count	%
French	238	22.2%
Arab	131	12.2%
Italian	69	6.4%

Ancestry	Count	%
English	17	1.6%
Dutch	10	0.9%

Technology access

Metric	% of households
Computer access	37.4%
Internet access	67.1%

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

Frequently asked questions

What is the ZIP code for Green Castle, MO?

Green Castle, MO has one ZIP code: 63544.

What is the main ZIP code for Green Castle, MO?

The primary ZIP code for Green Castle, MO is 63544. The city uses area code 660 for phone service.

What county is Green Castle, MO in?

Green Castle is located in Sullivan County, Missouri.

How many ZIP codes are in Green Castle, MO?

Green Castle, MO has 1 ZIP code.

What is the ZIP code for downtown Green Castle, Missouri?

Downtown Green Castle, Missouri is located in ZIP code 63544, which serves as the primary postal code for this Sullivan County community.

If I'm mailing something to a business in Green Castle, MO, what ZIP code should I use?

All mail addressed to Green Castle, Missouri should use ZIP code 63544, as it is the sole ZIP code designated for this city.