Residential delivery area · Tennessee
ZIP Code 37166: Smithville, TN
ZIP code 37166 uses the postal name Smithville, Tennessee and lies mostly in DeKalb County (91% of its land), reaching into Warren County and Cannon County (Census 2020 ZIP-county file). About 16,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $52,797 (Census Bureau, ACS 2020-2024). By Census place, 4% of its land lies in Smithville; 96% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Smithville · its only residential ZIP
- County
- DeKalb County (91%); Warren County (7%); Cannon County (2%)
- Census places
- Smithville
- House districts
- TN-6 (93%), TN-4 (7%) 119th Congress, by share of land
- State
- Tennessee
- Time zone
- Central
- Land area
- 154.6 sq mi · 102 people per sq mi
Where is ZIP code 37166?
37166 centers on 35.918°, -85.787° and covers 154.6 square miles of land plus 11.5 of water. It borders 9 ZIP codes: 37059, 37095, 38587, 38582, 38544, 38581, 37190, 37110, 38583.
The map draws ZIP code areas only. For the streets inside 37166, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 37166 compare with the rest of DeKalb County?
| Measure | 37166 | In DeKalb County | In TN |
|---|---|---|---|
| People (ACS 2020-2024) | 15,731 | 2nd of 11 | 158th of 636 |
| Median household income | $53k | 4th of 5 | 323rd of 425 |
| Median home value | $224k | 4th of 6 | 229th of 436 |
Its median household income is higher than in 18% of U.S. residential ZIP codes, and it is denser than 54% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 37166?
The 2020 Census counted 14,379 people in 37166; the ACS, which samples households over 2020-2024, estimates 15,731. Between the 2010 and 2020 censuses its population grew 6.9% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 15,731
- 2020 Census count
- 14,379+6.9% since 2010 (13,446)
- Households
- 6,300
- Median age
- 41.2
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 37166?
Of the 15,731 people the ACS estimates in 37166, 23.9% are under 18 and 16.4% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (84.7%), then Hispanic or Latino (10.1%).
- Under 1823.9%
- 18 to 6459.6%
- 65 and older16.4%
- White, not Hispanic84.7%
- Hispanic or Latino10.1%
- Other or two or more2.4%
- Asian, not Hispanic1.4%
- Black, not Hispanic1.4%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 37166 earn?
Median household income is $52,797 (ACS 2020-2024), the 4th highest of the 5 ranked ZIP codes in DeKalb County. It is not measurably different from 2015-2019 ($54,164 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $52,797±$8,826
- Income per person
- $26,766
- Below the poverty line
- 18.7%
- Unemployed (of the labor force)
- 4.6%
- Adults 25+ with a bachelor's degree
- 20.1%
- Adjusted gross income per tax return, 2022
- $60,4146,300 returns; wages 69% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 37166?
FHFA's house price index for 37166, built from repeat sales and appraisals of the same homes, rose 142% from 2015 to 2025 and rose 70% from 2020 to 2025, and moved +2.1% in 2025.
- Median home value (owners' estimate)
- $224,300
- Median gross rent
- $813
- Homes owned by their occupants
- 71.8%
- Housing units
- 7,205
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 37166?
260 business establishments had a location in this ZIP code in 2023, 25 more than in 2018; the most are in retail trade (ZIP Code Business Patterns).
- Retail trade53
- Health care and social assistance36
- Accommodation and food services27
- Other services (except public administration)26
- Construction23
- Professional, scientific, and technical services18
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 37166?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 37059 | Dowelltown | 1,590 | $50k | 8.0 mi |
| 37095 | Liberty | 1,697 | $65k | 10.3 mi |
| 38587 | Walling | 1,446 | $52k | 10.4 mi |
| 38582 | Silver Point | 1,729 | $93k | 12.6 mi |
| 38544 | Baxter | 8,175 | $70k | 15.2 mi |
| 38581 | Rock Island | 4,079 | $56k | 15.4 mi |
| 37190 | Woodbury | 9,525 | $65k | 15.7 mi |
| 37110 | McMinnville | 34,296 | $53k | 19.0 mi |
| 38583 | Sparta | 25,584 | $55k | 20.1 mi |
| 38550 | Campaign | 17 | – | 13.4 mi (near) |
| 38569 | Lancaster | 390 | – | 14.4 mi (near) |
| 38579 | Quebeck | 1,475 | $52k | 14.5 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.