37031 ZIP Code — Castalian Springs, TN

Sumner County, Tennessee

ZIP code 37031 is located in Castalian Springs, Tennessee, within Sumner County. It covers approximately 38.25 square miles and serves a population of 4,089 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 615.

About ZIP code 37031

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 2000s, giving the area an established character. Median home value is $277,200. Owner-occupancy is high at 88%, well above the national average.

Median household income is $80,417. The poverty rate of 7% is below the national average. 35% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 35 minutes is near the national average.

College attainment at 19% is below the national average, consistent with a trades and production-oriented local economy.

Health indicators show elevated rates of smoking (24%) compared to national benchmarks.

Overall, ZIP code 37031 reflects a community defined by a trades-oriented workforce, high homeownership, and a significant Social Security-dependent population.

4,089

population

38.25

sq mi land

Standard

ZIP type

Central (CT)

timezone

37031 ZIP code map

Cities in ZIP code 37031

Below are the cities the US Postal Service accepts for ZIP code 37031. Using any city not on this list may result in mail delivery delays.

City	Status
Castalian Springs	Acceptable
Castalian Springs	Preferred

Nearby ZIP codes

37087 Lebanon (6.6 mi) 37022 Bethpage (8.2 mi) 37074 Hartsville (8.7 mi) 37066 Gallatin (9.4 mi) 37151 Riddleton (13.9 mi) 37186 Westmoreland (14.5 mi) 37057 Dixon Springs (15.1 mi) 37090 Lebanon (17 mi) 37075 Hendersonville (17.3 mi) 37122 Mount Juliet (17.6 mi) 37048 Cottontown (18.2 mi) 37148 Portland (18.3 mi)

Demographics updated 05/2026

Population
Total population	4,089
Population density	107 / sq mi
State FIPS	47
County FIPS	165

Geography
Land area	38.25 sq mi
Water area	1.76 sq mi
Latitude	36.3740
Longitude	-86.2919
Timezone	Central (CT)
Area code	615

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	31.5%	35.2%	45.7%
$50k – $100k	40.1%	34.1%	30.9%
$100k – $200k	24.9%	24.4%	18.3%
Over $200k	3.5%	6.4%	5.1%

Demographics & statistics

4,089

Population

107

People per sq mi

48.0

Median age

$80,417

Median household income

$43,330

Per capita income

$277,200

Median home value

$992

Median monthly rent

88.1%

Home ownership

6.5%

Poverty rate

0.9%

Unemployment

1,619

Housing units

19.1%

Bachelor's or higher

Age distribution

Male Female

Under 5

5–9

10–14

128

15–19

121

20–24

305

25–34

291

256

35–44

243

271

45–54

259

283

55–59

270

195

60–64

186

247

65–74

235

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	558	13.6%
18 and over	3,531	86.4%
65 and over	731	17.9%
Median age	48.0 years

Race & ethnicity

White 88.3%

Black or African American 3.2%

Hispanic or Latino 3.2%

Two or more races 2.6%

Other race 2.3%

Native Hawaiian / Pacific Islander 0.4%

Group	Count	%
White	3,726	88.3%
Black or African American	137	3.2%
Hispanic or Latino	133	3.2%
Two or more races	111	2.6%
Other race	98	2.3%
Native Hawaiian / Pacific Islander	16	0.4%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	31.5%	35.2%	45.7%
$50k – $100k	40.1%	34.1%	30.9%
$100k – $200k	24.9%	24.4%	18.3%
Over $200k	3.5%	6.4%	5.1%

Under $10k 3.4%

$10k–$15k 0.2%

$15k–$25k 5.3%

$25k–$35k 9.7%

$35k–$50k 8.6%

$50k–$75k 19.0%

$75k–$100k 18.4%

$100k–$150k 24.7%

$150k–$200k 5.5%

$200k+ 5.2%

Range	% of households
Under $10k	3.4%
$10k–$15k	0.2%
$15k–$25k	5.3%
$25k–$35k	9.7%
$35k–$50k	8.6%
$50k–$75k	19.0%
$75k–$100k	18.4%
$100k–$150k	24.7%
$150k–$200k	5.5%
$200k+	5.2%
Median income	$80,417

Housing

Home values

Under $50k 2.7%

$50k–$100k 7.2%

$100k–$150k 6.8%

$150k–$200k 10.8%

$200k–$300k 27.5%

$300k–$500k 30.4%

$500k–$1M 13.1%

$1M+ 1.4%

Housing overview

Metric	Value
Median home value	$277,200
Median rent / month	$992
Owner occupied	88.1%
Renter occupied	11.9%
Vacant	7.8%
Single-family detached	86.5%
Large apartment buildings	0.0%
Mobile homes	12.8%
Median rooms	6.3
Avg household size (owned)	2.50

Year built

Era	%
2020 or later	1.2%
2010–2019	18.1%
2000–2009	25.2%
1990–1999	17.2%
1980–1989	8.0%
1970–1979	16.8%
1960–1969	5.7%
1950–1959	0.0%
1940–1949	2.4%
1939 or earlier	5.4%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	1.1%
2 bedrooms	12.9%
3 bedrooms	72.1%
4 bedrooms	12.2%
5+ bedrooms	1.8%

Vehicles per household

Vehicles	% of households
No vehicle	0.6%
1 vehicle	25.5%
2 vehicles	42.7%
3 or more	31.2%

Heating fuel

Fuel type	%
Utility gas	9.4%
Electricity	71.6%
Propane / LP gas	14.7%
No fuel used	4.3%

Households & families

Household type	Count	%
Married-couple family	1,117	66.6%
Cohabiting couple	88	5.2%
Male householder, no spouse	194	11.6%
Female householder, no spouse	278	16.6%
Households with children under 18	379	22.6%
Households with seniors (65+)	496	29.6%
Average household size	2.42

Marital status

Status	Male	Female
Never married	13.0%	18.2%
Married	69.6%	63.9%
Separated	0.6%	0.0%
Widowed	2.2%	6.9%
Divorced	14.7%	11.0%

Education

Less than 9th grade 3.7%

Some HS, no diploma 3.3%

HS graduate 44.6%

Some college, no degree 21.2%

Associate's degree 8.2%

Bachelor's degree 13.1%

Graduate / professional 6.0%

Metric	%
HS diploma or higher	93.0%
Bachelor's or higher	19.1%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	72	12.0%
Kindergarten	17	2.8%
Elementary school	263	43.7%
High school	109	18.1%
College / grad school	141	23.4%

Employment

Industry of employment

Education & healthcare 15.5%

Other services 13.5%

Manufacturing 12.2%

Transportation & utilities 12.2%

Retail trade 10.8%

Arts, food & hospitality 8.8%

Professional & management 6.6%

Construction 5.9%

Finance & real estate 4.7%

Public administration 4.3%

Wholesale trade 3.4%

Agriculture & mining 1.2%

Information 1.0%

Occupation

Category	%
Management, business & arts	37.4%
Service	14.0%
Sales & office	19.7%
Natural resources & construction	10.3%
Production & transportation	18.6%

Employment type

Type	%
Private sector	72.5%
Government	19.6%
Self-employed	8.0%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	73.7%
Carpool	15.5%
Public transit	0.0%
Walk	0.0%
Work from home	10.3%
Other means	0.5%
Avg commute (minutes)	34.8

Poverty

All people 6.5%

Under 18 years 5.0%

18 and over 6.7%

Married-couple families 2.7%

Female-led households 9.1%

Income support

Source	% of households
Social Security	34.8%
Retirement income	19.9%
Supplemental Security	4.8%
Cash public assistance	2.6%
Food stamps / SNAP	2.9%

Health indicators

Condition	%
Obesity	37.3%
High blood pressure	35.2%
High cholesterol	34.5%
Diabetes	10.9%
Heart disease	6.3%
Stroke	2.9%
Asthma	10.2%
Arthritis	27.3%
Kidney disease	2.6%
Pulmonary disease	7.9%
Cancer	6.2%

Behavior / access	%
Smoking	23.6%
Binge drinking	15.7%
No physical activity	24.5%
Less than 7 hrs sleep	33.1%
Depression	26.8%
Fair or poor health	14.7%
Poor mental health	17.0%
Poor physical health	10.9%
No health insurance	15.8%
Visited doctor (checkup)	72.7%
Visited dentist	60.5%
Cholesterol screening	90.2%
Teeth loss	15.3%

Veterans & disability

Veterans	Count	%
Civilian veterans	309	8.8%

Disability	%
Any disability	19.0%
Under 18	3.6%
18–64 years	12.6%
65 and over	54.9%

Health insurance coverage

Type	%
Private insurance	75.0%
Public insurance	28.3%
No insurance	8.5%
Uninsured under 19	15.1%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	3,962	96.9%
Spanish	30	0.8%
Other Indo-European	30	0.8%
Asian & Pacific Islander	0	0.0%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	4,029	98.5%
Born in same state	3,964	96.9%
Born in different state	2,313	56.6%
Foreign born	65	1.6%
Naturalized citizen	60	1.5%
Not a US citizen	45	75.0%

Ancestry

Ancestry	Count	%
Arab	925	22.6%
French	590	14.4%
Italian	366	9%

Ancestry	Count	%
English	116	2.8%
German	16	0.4%
Polish	10	0.2%

Technology access

Metric	% of households
Computer access	41.0%
Internet access	87.3%

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

Frequently asked questions about ZIP code 37031

What city is ZIP code 37031 in?

ZIP code 37031 is primarily assigned to Castalian Springs, Tennessee.

What county is ZIP code 37031 in?

ZIP code 37031 falls within Sumner County, Tennessee.

Is ZIP code 37031 mostly owner-occupied?

88% of occupied units in ZIP code 37031 are owner-occupied, well above the national average.

What is the population of ZIP code 37031?

ZIP code 37031 has an estimated population of 4,089 residents, with a density of 107 people per square mile.

What is the typical home value in ZIP code 37031?

The median home value in ZIP code 37031 is $277,200.

What is the median household income in ZIP code 37031?

The median household income in ZIP code 37031 is $80,417, above the national median of ~$75,000.

What timezone is ZIP code 37031 in?

ZIP code 37031 observes the CST timezone.