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County ZIP codes · Tennessee · FIPS 47171

Unicoi County, TN ZIP Codes

Unicoi County, Tennessee has 5 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 3 of the residential ones lie mainly in Unicoi County and 2 mainly in a neighboring county; 3 cross the county line. Median household income ranges from $50,654 in 37650 (Erwin) to $73,108 in 37657 (Flag Pond) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Unicoi County?

37601 · Johnson City: $51k37643 · Elizabethton: $52k37650 · Erwin: $51k37657 · Flag Pond: $73k37692 · Unicoi: $54k376433765037601376923765737601 · Johnson City: $51k37643 · Elizabethton: $52k37650 · Erwin: $51k37657 · Flag Pond: $73k37692 · Unicoi: $54k376433765037601376923765737601 · Johnson City: $51k37643 · Elizabethton: $52k37650 · Erwin: $51k37657 · Flag Pond: $73k37692 · Unicoi: $54k3764337650376013769237657
The residential ZIP codes of Unicoi County (whole outlines, including the parts in neighboring counties), shaded by median household income in national fifths (ACS 2020-2024). <$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are its ZIP codes?

The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $50,686 and $53,531.

They carry 5 postal town names: Johnson City, Elizabethton, Erwin, Unicoi, Flag Pond.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).

All 5 residential ZIP codes in Unicoi County

3 ZIP codes lie mainly in Unicoi County; 2 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Unicoi County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
37650 Erwin 12,774 132 $51k $168k 96%
37692 Unicoi 4,766 90 $54k $233k 100%
37657 Flag Pond 1,060 29 $73k $191k 100%

Partly in Unicoi County

Residential ZIP codes mainly in another county that reach at least 1% into Unicoi County, by their share here
In this county
37601 Johnson City 38,008 796 $51k $216k 3%
37643 Elizabethton 34,120 260 $52k $167k 1%

Download the 5 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).

Which ZIP codes cross the county line?

3 ZIP codes of Unicoi County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Unicoi County and in the neighboring counties
ZIPIn UnicoiElsewhere
376013%Washington County 53%; Carter County 45%
376431%Carter County 99%
3765096%Washington County 4%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).

Which first three digits do Unicoi County's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Unicoi County starts with 376.

Three-digit prefixes of Unicoi County's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Unicoi County's
PrefixSectional centerHereAll codes
376 Johnson City, TN (SCF 376) 5 42

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.