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County ZIP codes · Tennessee · FIPS 47057

Grainger County, TN ZIP Codes

Grainger County, Tennessee has 8 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 6 of the residential ones lie mainly in Grainger County and 2 mainly in a neighboring county; 6 cross the county line. Median household income ranges from $42,152 in 37708 (Bean Station) to $75,799 in 37709 (Blaine) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Grainger County?

37708 · Bean Station: $42k37709 · Blaine: $76k37806 · Mascot: $60k37811 · Mooresburg: $52k37848 · Powder Springs: –37861 · Rutledge: $52k37881 · Thorn Hill: $37k37888 · Washburn: $46k378813786137888378113770837709378063784837708 · Bean Station: $42k37709 · Blaine: $76k37806 · Mascot: $60k37811 · Mooresburg: $52k37848 · Powder Springs: –37861 · Rutledge: $52k37881 · Thorn Hill: $37k37888 · Washburn: $46k378813786137888378113770837709378063784837708 · Bean Station: $42k37709 · Blaine: $76k37806 · Mascot: $60k37811 · Mooresburg: $52k37848 · Powder Springs: –37861 · Rutledge: $52k37881 · Thorn Hill: $37k37888 · Washburn: $46k37881378613788837811377083770937806
The residential ZIP codes of Grainger 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 $42,152 and $52,265.

They carry 8 postal town names: Rutledge, Bean Station, Blaine, Mooresburg, Mascot, Washburn, Thorn Hill, Powder Springs.

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

All 8 residential ZIP codes in Grainger County

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

Residential ZIP codes mainly in Grainger County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
37861 Rutledge 8,608 87 $52k $214k 100%
37708 Bean Station 6,512 158 $42k $169k 100%
37709 Blaine 4,177 101 $76k $275k 99%
37888 Washburn 3,432 62 $46k $137k 91%
37881 Thorn Hill 1,677 23 $37k $112k 56%
37848 Powder Springs 145 18 – $168k 75%

Partly in Grainger County

Residential ZIP codes mainly in another county that reach at least 1% into Grainger County, by their share here
In this county
37806 Mascot 3,674 202 $60k $221k 11%
37811 Mooresburg 3,931 102 $52k $163k 2%

Download the 8 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?

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

Share of each ZIP code's land in Grainger County and in the neighboring counties
ZIPIn GraingerElsewhere
3770999%Knox County 1%
378112%Hawkins County 98%
3780611%Knox County 89%
3788891%Union County 9%
3788156%Hancock County 36%; Hawkins County 7%
3784875%Union County 25%

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

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Grainger County's ZIP codes use 2 prefixes: 377 and 378.

Three-digit prefixes of Grainger 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 Grainger County's
PrefixSectional centerHereAll codes
377 Knoxville, TN (SCF 377) 2 53
378 Knoxville, TN (SCF 377) 6 67

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