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County ZIP codes · Tennessee · FIPS 47163

Sullivan County, TN ZIP Codes

Sullivan County, Tennessee has 15 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 10 residential and 5 for PO boxes or a single organization. 8 of the residential ones lie mainly in Sullivan County and 2 mainly in a neighboring county; 4 cross the county line. Median household income ranges from $49,191 in 37660 (Kingsport) to $84,264 in 37686 (Piney Flats) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Sullivan County?

37617 · Blountville: $65k37618 · Bluff City: $64k37620 · Bristol: $56k37656 · Fall Branch: $64k37660 · Kingsport: $49k37663 · Kingsport: $76k37664 · Kingsport: $64k37665 · Kingsport: $51k37686 · Piney Flats: $84k37694 · Watauga: $81k3762037660376183766437617376863765637663376943766537617 · Blountville: $65k37618 · Bluff City: $64k37620 · Bristol: $56k37656 · Fall Branch: $64k37660 · Kingsport: $49k37663 · Kingsport: $76k37664 · Kingsport: $64k37665 · Kingsport: $51k37686 · Piney Flats: $84k37694 · Watauga: $81k376203766037618376173768637656376633769437617 · Blountville: $65k37618 · Bluff City: $64k37620 · Bristol: $56k37656 · Fall Branch: $64k37660 · Kingsport: $49k37663 · Kingsport: $76k37664 · Kingsport: $64k37665 · Kingsport: $51k37686 · Piney Flats: $84k37694 · Watauga: $81k37620376603761837617376863765637663
The residential ZIP codes of Sullivan 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 $56,128 and $64,764.

They carry 7 postal town names: Kingsport, Bristol, Blountville, Bluff City, Piney Flats, Fall Branch, Watauga.

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

All 10 residential ZIP codes in Sullivan County

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

Residential ZIP codes mainly in Sullivan County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
37660 Kingsport 40,996 624 $49k $199k 91%
37620 Bristol 38,494 300 $56k $189k 100%
37664 Kingsport 28,267 833 $64k $240k 100%
37617 Blountville 14,744 252 $65k $248k 100%
37663 Kingsport 14,230 553 $76k $239k 95%
37618 Bluff City 12,548 181 $64k $189k 100%
37686 Piney Flats 9,495 322 $84k $352k 100%
37665 Kingsport 4,741 1,566 $51k $134k 100%

Partly in Sullivan County

Residential ZIP codes mainly in another county that reach at least 1% into Sullivan County, by their share here
In this county
37694 Watauga 1,729 137 $81k $203k 18%
37656 Fall Branch 3,849 132 $64k $237k 8%

Download the 15 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?

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

Share of each ZIP code's land in Sullivan County and in the neighboring counties
ZIPIn SullivanElsewhere
3766091%Hawkins County 9%
3766395%Washington County 5%
376568%Washington County 63%; Greene County 29%
3769418%Carter County 79%; Washington County 3%

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

PO Box and single-organization ZIP codes

ZIP codes in Sullivan County without a residential area (GeoNames postal codes)
ZIPPostal name
37621Bristol
37625Bristol
37662Kingsport
37669Kingsport
37699Piney Flats

Source: GeoNames postal codes (CC BY 4.0).

Which first three digits do Sullivan 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 Sullivan County starts with 376.

Three-digit prefixes of Sullivan 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 Sullivan County's
PrefixSectional centerHereAll codes
376 Johnson City, TN (SCF 376) 15 42

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