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Where 37640 is
Approximate ZIP boundary (Census ZCTA 2020). ZIP codes are mail routes, not areas, so the shape shown is the Census tabulation area that approximates it.
- 🔢 Type 37640 into a pocket calculator and turn it upside down: OhgLE — not quite a word, sorry.
- ➕ As a number, 37,640 = 2 × 2 × 2 × 5 × 941. Its digits add up to 20, a total 2,586 other ZIP codes share.
- 💾In binary, the way a computer stores it:
1001001100001000 - 🏠 Its numerical neighbours: 37625 (Bristol, TN, 22 mi away) and 37641 (Chuckey, TN, 39 mi away).
- 🔄 Backwards, 37640 becomes 04673 — and that is a real ZIP code: Sargentville, ME, 890 miles away.
- 👥 63 other ZIP codes are made of exactly the same digits (03467, 03746, 04637, 04673, 04736, 04763, …). The farthest-flung twin is 04736 in Caribou, ME, 1,024 miles away.
- 🧭 Farther south than 67% of all ZIP codes, and farther east than 67%.
- 🎯933 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 37640 and you would come out at 36.33°S, 98.03°E — 1,062 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 38m of daylight. Shortest: 9h 41m.
- 📏 At 105.0 square miles of land, 37640 is bigger than 79% of ZIP codes — room for about 80 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 3,851This ZIP3,851 |
|---|---|
| Households | 1,899This ZIP1,899 |
| Housing units | 2,503This ZIP2,503 |
| Median age | 53.4This ZIP53.4Tennessee38.9US 38.9 |
| Median household income | $55,402This ZIP$55,402Tennessee$69,595US $80,734 |
| Median home value | $174,000This ZIP$174,000Tennessee$286,700US $332,700 |
| Median gross rent | $687This ZIP$687Tennessee$1,189US $1,413 |
| Bachelor's degree or higher | 20.9%This ZIP20.9% |
| Mean commute | 34.4 minThis ZIP34.4 min |
| Population density | 36.7 / sq miThis ZIP36.7 / sq mi |
Business and tax activity
| Business establishments | 37This ZIP37 |
|---|---|
| Employees | 130This ZIP130 |
| Annual payroll | $5,461,000This ZIP$5,461,000 |
| Tax returns filed | 1,430This ZIP1,430 |
| Total adjusted gross income | $108,280,000This ZIP$108,280,000 |
Land area
| Land area | 105.00 sq miThis ZIP105.00 sq mi |
|---|---|
| Water area | 7.64 sq miThis ZIP7.64 sq mi |
Counties 37640 spans
A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.
| County | Share of this ZIP |
|---|---|
| Johnson County | 63.5% |
| Carter County | 36.5% |
Other place names in 37640
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 37640
| ZIP | City | Distance |
|---|---|---|
28692 | Vilas, NC | 7.7 mi |
37643 | Elizabethton, TN | 8.8 mi |
28679 | Sugar Grove, NC | 8.8 mi |
28622 | Elk Park, NC | 9.2 mi |
37658 | Hampton, TN | 10.9 mi |
28698 | Zionville, NC | 11.9 mi |
37683 | Mountain City, TN | 12.2 mi |
28604 | Banner Elk, NC | 12.2 mi |
37687 | Roan Mountain, TN | 12.3 mi |
37691 | Trade, TN | 12.5 mi |
Find every ZIP code within 10 miles of 37640 →
Questions about this ZIP code
Where is ZIP code 37640?
37640 is in Butler, Tennessee, in Johnson County. Its published point location is 36.3268, -81.9747.
What county is 37640 in?
37640 spans 2 counties: Johnson County and Carter County. Most of it falls in Johnson County, measured by overlapping land area — the county holding the most land in a ZIP code is not always the one holding the most residents.
What area code is 37640?
Butler uses area code 423, from NANPA's telephone records.
What time zone is 37640 in?
37640 uses America/New_York.
How many people live in 37640?
About 3,851 people live in ZIP code 37640, in 1,899 households, at 36.7 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.
What is the median household income in 37640?
$55,402 a year, against $69,595 across Tennessee.
What ZIP codes are near 37640?
The closest are 28692 (7.7 mi), 37643 (8.8 mi), 28679 (8.8 mi), 28622 (9.2 mi) and 37658 (10.9 mi).
Is 37640 a PO Box ZIP code?
37640 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “37640 ZIP Code — Butler, Tennessee (Johnson County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/37640
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/37640.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.