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County ZIP codes · Maine · FIPS 23013

Knox County, ME ZIP Codes

Knox County, Maine has 20 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 19 residential and 1 for PO boxes or a single organization. Median household income ranges from $56,435 in 04861 (Thomaston) to $87,325 in 04854 (Owls Head) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Knox County?

04547 · Friendship: $76k04563 · Cushing: $84k04574 · Washington: $60k04645 · Isle Au Haut: $50k04841 · Rockland: $57k04843 · Camden: $82k04847 · Hope: $87k04851 · Matinicus: $65k04853 · North Haven: $88k04854 · Owls Head: $87k04855 · Port Clyde: $250k+04856 · Rockport: $87k04858 · South Thomaston: $87k04859 · Spruce Head: $75k04860 · Tenants Harbor: $87k04861 · Thomaston: $56k04862 · Union: $74k04863 · Vinalhaven: $73k04864 · Warren: $75k048620486004854048640484304547045740456304863048560484704645048530484104858048610485904547 · Friendship: $76k04563 · Cushing: $84k04574 · Washington: $60k04645 · Isle Au Haut: $50k04841 · Rockland: $57k04843 · Camden: $82k04847 · Hope: $87k04851 · Matinicus: $65k04853 · North Haven: $88k04854 · Owls Head: $87k04855 · Port Clyde: $250k+04856 · Rockport: $87k04858 · South Thomaston: $87k04859 · Spruce Head: $75k04860 · Tenants Harbor: $87k04861 · Thomaston: $56k04862 · Union: $74k04863 · Vinalhaven: $73k04864 · Warren: $75k048620486004854048640484304547045740456304863048560484704645048530484104858048610485904547 · Friendship: $76k04563 · Cushing: $84k04574 · Washington: $60k04645 · Isle Au Haut: $50k04841 · Rockland: $57k04843 · Camden: $82k04847 · Hope: $87k04851 · Matinicus: $65k04853 · North Haven: $88k04854 · Owls Head: $87k04855 · Port Clyde: $250k+04856 · Rockport: $87k04858 · South Thomaston: $87k04859 · Spruce Head: $75k04860 · Tenants Harbor: $87k04861 · Thomaston: $56k04862 · Union: $74k04863 · Vinalhaven: $73k04864 · Warren: $75k04862048600485404864048430456304863048560464504853
The residential ZIP codes of Knox 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 $72,963 and $86,833.

They carry 19 postal town names.

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

All 19 residential ZIP codes in Knox County

Residential ZIP codes mainly in Knox County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
04841 Rockland 7,035 548 $57k $246k 100%
04843 Camden 5,242 284 $82k $521k 100%
04864 Warren 4,932 106 $75k $233k 100%
04862 Union 4,023 62 $74k $252k 100%
04856 Rockport 3,675 170 $87k $469k 100%
04861 Thomaston 2,769 253 $56k $272k 100%
04847 Hope 1,748 80 $87k $373k 100%
04574 Washington 1,624 43 $60k $195k 100%
04860 Tenants Harbor 1,543 79 $87k $271k 100%
04854 Owls Head 1,482 140 $87k $413k 100%
04563 Cushing 1,460 76 $84k $410k 100%
04858 South Thomaston 1,378 121 $87k $341k 100%
04863 Vinalhaven 1,216 52 $73k $428k 100%
04547 Friendship 1,213 86 $76k $275k 100%
04859 Spruce Head 753 170 $75k – 100%
04853 North Haven 480 42 $88k $440k 100%
04855 Port Clyde 313 268 $250k+ $358k 100%
04645 Isle Au Haut 69 6 $50k $594k 100%
04851 Matinicus 48 25 $65k $350k 100%

Download the 20 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).

PO Box and single-organization ZIP codes

ZIP codes in Knox County without a residential area (GeoNames postal codes)
ZIPPostal name
04865West Rockport

Source: GeoNames postal codes (CC BY 4.0).

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Knox County's ZIP codes use 3 prefixes: 045, 046 and 048.

Three-digit prefixes of Knox 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 Knox County's
PrefixSectional centerHereAll codes
045 Southern, ME (SCF 040) 3 31
046 Eastern, ME (SCF 044) 1 63
048 Southern, ME (SCF 040) 16 20

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