37166 ZIP Code — Smithville, TN

Dekalb County, Tennessee

ZIP code 37166 is located in Smithville, Tennessee, within Dekalb County. It covers approximately 154.59 square miles and serves a population of 14,051 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 615/931.

About ZIP code 37166

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1970s, giving the area an established character. Median home value is $169,900. Owner-occupancy sits near the national average at 65%.

Median household income is $45,677. Poverty affects 19% of residents, above the national average. SNAP benefit usage at 19% of households reflects economic stress in the area. 35% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with manufacturing as the leading industry. The average commute of 27 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 (27%) compared to national benchmarks.

Notable community characteristics include disability rates above the national average at 25%.

Overall, ZIP code 37166 reflects a community defined by a trades-oriented workforce, economic challenges above the national average, a significant Social Security-dependent population, and elevated reliance on food assistance.

14,051

population

154.59

sq mi land

Standard

ZIP type

Central (CT)

timezone

37166 ZIP code map

Cities in ZIP code 37166

Below are the cities the US Postal Service accepts for ZIP code 37166. Using any city not on this list may result in mail delivery delays.

City	Status
Smithville	Preferred

Nearby ZIP codes

37059 Dowelltown (6.9 mi) 37095 Liberty (8.8 mi) 38587 Walling (10.8 mi) 38582 Silver Point (11.1 mi) 38544 Baxter (14.2 mi) 37012 Alexandria (14.6 mi) 38567 Hickman (15.2 mi) 37190 Woodbury (15.8 mi) 38548 Buffalo Valley (16.4 mi) 38559 Doyle (16.8 mi) 37110 Mcminnville (17.5 mi) 38552 Chestnut Mound (18.1 mi)

Demographics updated 05/2026

Population
Total population	14,051
Population density	91 / sq mi
State FIPS	47
County FIPS	041

Geography
Land area	154.59 sq mi
Water area	11.46 sq mi
Latitude	35.9386
Longitude	-85.7874
Timezone	Central (CT)
Area code	615/931

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	54.4%	54.6%	45.7%
$50k – $100k	31.8%	29.3%	30.9%
$100k – $200k	11.0%	13.8%	18.3%
Over $200k	2.9%	2.2%	5.1%

Demographics & statistics

14,051

Population

People per sq mi

43.2

Median age

$45,677

Median household income

$26,799

Per capita income

$169,900

Median home value

$739

Median monthly rent

64.9%

Home ownership

19.2%

Poverty rate

3.7%

Unemployment

4,757

Housing units

18.5%

Bachelor's or higher

Age distribution

Male Female

445

Under 5

445

384

5–9

385

391

10–14

392

376

15–19

376

356

20–24

356

939

25–34

939

885

35–44

886

1,032

45–54

1,034

496

55–59

497

473

60–64

473

714

65–74

714

355

75–84

356

176

85+

176

← Male

Female →

Age summary

Group	Count	%
Under 18	2,986	21.3%
18 and over	11,065	78.7%
65 and over	2,491	17.7%
Median age	43.2 years

Race & ethnicity

White 84.1%

Hispanic or Latino 5.9%

Two or more races 4.3%

Other race 3.4%

Black or African American 1.5%

Asian 0.4%

American Indian / Alaska Native 0.4%

Group	Count	%
White	12,551	84.1%
Hispanic or Latino	876	5.9%
Two or more races	649	4.3%
Other race	511	3.4%
Black or African American	217	1.5%
Asian	62	0.4%
American Indian / Alaska Native	61	0.4%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	54.4%	54.6%	45.7%
$50k – $100k	31.8%	29.3%	30.9%
$100k – $200k	11.0%	13.8%	18.3%
Over $200k	2.9%	2.2%	5.1%

Under $10k 7.0%

$10k–$15k 6.5%

$15k–$25k 13.4%

$25k–$35k 13.5%

$35k–$50k 12.2%

$50k–$75k 18.7%

$75k–$100k 13.3%

$100k–$150k 9.7%

$150k–$200k 3.7%

$200k+ 2.0%

Range	% of households
Under $10k	7.0%
$10k–$15k	6.5%
$15k–$25k	13.4%
$25k–$35k	13.5%
$35k–$50k	12.2%
$50k–$75k	18.7%
$75k–$100k	13.3%
$100k–$150k	9.7%
$150k–$200k	3.7%
$200k+	2.0%
Median income	$45,677

Housing

Home values

Under $50k 5.6%

$50k–$100k 14.8%

$100k–$150k 17.9%

$150k–$200k 23.8%

$200k–$300k 18.7%

$300k–$500k 10.2%

$500k–$1M 7.6%

$1M+ 1.3%

Housing overview

Metric	Value
Median home value	$169,900
Median rent / month	$739
Owner occupied	64.9%
Renter occupied	35.1%
Vacant	14.4%
Single-family detached	71.1%
Large apartment buildings	0.5%
Mobile homes	16.7%
Median rooms	5.4
Avg household size (owned)	2.42

Year built

Era	%
2020 or later	0.5%
2010–2019	9.1%
2000–2009	15.1%
1990–1999	18.2%
1980–1989	8.2%
1970–1979	24.1%
1960–1969	12.7%
1950–1959	7.1%
1940–1949	2.4%
1939 or earlier	2.5%

Bedrooms

Size	% of units
No bedroom (studio)	3.5%
1 bedroom	6.1%
2 bedrooms	24.2%
3 bedrooms	57.1%
4 bedrooms	8.2%
5+ bedrooms	0.9%

Vehicles per household

Vehicles	% of households
No vehicle	9.5%
1 vehicle	25.2%
2 vehicles	37.8%
3 or more	27.5%

Heating fuel

Fuel type	%
Utility gas	36.6%
Electricity	60.9%
Propane / LP gas	1.3%
Wood	1.1%
No fuel used	0.1%

Households & families

Household type	Count	%
Married-couple family	2,870	49.3%
Cohabiting couple	271	4.7%
Male householder, no spouse	960	16.5%
Female householder, no spouse	1,722	29.6%
Households with children under 18	1,895	32.5%
Households with seniors (65+)	1,744	30.0%
Average household size	2.36

Marital status

Status	Male	Female
Never married	23.2%	17.1%
Married	60.8%	50.3%
Separated	2.2%	1.9%
Widowed	2.5%	9.3%
Divorced	11.3%	21.5%

Education

Less than 9th grade 8.6%

Some HS, no diploma 12.0%

HS graduate 41.1%

Some college, no degree 16.8%

Associate's degree 2.9%

Bachelor's degree 12.7%

Graduate / professional 5.8%

Metric	%
HS diploma or higher	79.3%
Bachelor's or higher	18.5%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	134	5.1%
Kindergarten	174	6.6%
Elementary school	1,226	46.8%
High school	572	21.8%
College / grad school	513	19.6%

Employment

Industry of employment

Manufacturing 23.7%

Education & healthcare 21.7%

Retail trade 11.6%

Transportation & utilities 6.8%

Construction 6.2%

Finance & real estate 5.6%

Public administration 5.0%

Professional & management 4.7%

Arts, food & hospitality 4.5%

Agriculture & mining 4.2%

Other services 3.0%

Wholesale trade 1.8%

Information 1.2%

Occupation

Category	%
Management, business & arts	27.7%
Service	15.4%
Sales & office	18.5%
Natural resources & construction	13.1%
Production & transportation	25.4%

Employment type

Type	%
Private sector	77.9%
Government	15.9%
Self-employed	6.0%
Unpaid family workers	0.2%

Commute

Method	%
Drive alone	83.7%
Carpool	11.6%
Public transit	0.0%
Walk	0.4%
Work from home	4.2%
Other means	0.0%
Avg commute (minutes)	27.4

Poverty

All people 19.2%

Under 18 years 27.4%

18 and over 17.1%

Married-couple families 9.3%

Female-led households 31.0%

Income support

Source	% of households
Social Security	34.5%
Retirement income	26.6%
Supplemental Security	13.7%
Cash public assistance	5.8%
Food stamps / SNAP	18.9%

Health indicators

Condition	%
Obesity	40.3%
High blood pressure	41.0%
High cholesterol	37.2%
Diabetes	13.8%
Heart disease	8.4%
Stroke	4.1%
Asthma	11.0%
Arthritis	31.8%
Kidney disease	3.5%
Pulmonary disease	11.3%
Cancer	6.9%

Behavior / access	%
Smoking	26.6%
Binge drinking	13.5%
No physical activity	29.9%
Less than 7 hrs sleep	34.8%
Depression	27.7%
Fair or poor health	21.2%
Poor mental health	18.1%
Poor physical health	14.2%
No health insurance	20.5%
Visited doctor (checkup)	74.5%
Visited dentist	50.4%
Cholesterol screening	88.6%
Teeth loss	22.6%

Veterans & disability

Veterans	Count	%
Civilian veterans	737	6.7%

Disability	%
Any disability	24.5%
Under 18	5.0%
18–64 years	23.6%
65 and over	52.0%

Health insurance coverage

Type	%
Private insurance	59.0%
Public insurance	48.6%
No insurance	10.0%
Uninsured under 19	2.2%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	13,161	93.7%
Spanish	356	2.7%
Other Indo-European	307	2.3%
Asian & Pacific Islander	49	0.4%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	12,968	92.3%
Born in same state	12,908	91.9%
Born in different state	9,104	64.8%
Foreign born	60	0.4%
Naturalized citizen	1,083	7.7%
Not a US citizen	180	16.6%

Ancestry

Ancestry	Count	%
Arab	2,461	17.5%
Italian	1,832	13%
French	1,786	12.7%

Ancestry	Count	%
English	74	0.5%
German	45	0.3%
Polish	17	0.1%

Technology access

Metric	% of households
Computer access	41.4%
Internet access	84.8%

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

Frequently asked questions about ZIP code 37166

What city is ZIP code 37166 in?

ZIP code 37166 is primarily assigned to Smithville, Tennessee.

What county is ZIP code 37166 in?

ZIP code 37166 falls within Dekalb County, Tennessee.

What is the poverty rate in ZIP code 37166?

19% of residents in ZIP code 37166 live below the poverty line, above the national average.

What is the typical home value in ZIP code 37166?

The median home value in ZIP code 37166 is $169,900.

What is the median household income in ZIP code 37166?

The median household income in ZIP code 37166 is $45,677, below the national median of ~$75,000.

What is the population of ZIP code 37166?

ZIP code 37166 has an estimated population of 14,051 residents, with a density of 91 people per square mile.

What timezone is ZIP code 37166 in?

ZIP code 37166 observes the CST timezone.