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County ZIP codes · Minnesota · FIPS 27075

Lake County, MN ZIP Codes

Lake County, Minnesota has 9 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 8 of the residential ones lie mainly in Lake County and 1 mainly in a neighboring county; 4 cross the county line. Median household income ranges from $62,008 in 55731 (Ely) to $76,127 in 55616 (Two Harbors) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Lake County?

55601 · Beaver Bay: $56k55602 · Brimson: $74k55603 · Finland: $62k55607 · Isabella: $88k55609 · Knife River: $78k55614 · Silver Bay: $73k55616 · Two Harbors: $76k55731 · Ely: $62k55796 · Winton: $52k55731556165561455603556075560255601 · Beaver Bay: $56k55602 · Brimson: $74k55603 · Finland: $62k55607 · Isabella: $88k55609 · Knife River: $78k55614 · Silver Bay: $73k55616 · Two Harbors: $76k55731 · Ely: $62k55796 · Winton: $52k55731556165561455603556075560255601 · Beaver Bay: $56k55602 · Brimson: $74k55603 · Finland: $62k55607 · Isabella: $88k55609 · Knife River: $78k55614 · Silver Bay: $73k55616 · Two Harbors: $76k55731 · Ely: $62k55796 · Winton: $52k557315561655614556035560755602
The residential ZIP codes of Lake 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?

They carry 9 postal town names.

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

All 9 residential ZIP codes in Lake County

8 ZIP codes lie mainly in Lake County; 1 more reaches into it from a neighboring county and follows the first table.

Residential ZIP codes mainly in Lake County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
55616 Two Harbors 7,250 15 $76k $259k 91%
55731 Ely 5,361 3 $62k $206k 50%
55614 Silver Bay 2,485 11 $73k $182k 100%
55603 Finland 490 2 $62k $217k 100%
55607 Isabella 192 1 $88k $213k 100%
55796 Winton 135 616 $52k $96k 56%
55609 Knife River 131 53 $78k – 100%
55601 Beaver Bay 128 8 $56k $242k 100%

Partly in Lake County

Residential ZIP codes mainly in another county that reach at least 1% into Lake County, by their share here
In this county
55602 Brimson 346 1 $74k $248k 8%

Download the 9 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 Lake County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Lake County and in the neighboring counties
ZIPIn LakeElsewhere
5561691%St. Louis County9%
5573150%St. Louis County50%
556028%St. Louis County92%
5579656%St. Louis County44%

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

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Lake County's ZIP codes use 2 prefixes: 556 and 557.

Three-digit prefixes of Lake 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 Lake County's
PrefixSectional centerHereAll codes
556Duluth, MN (SCF 556)713
557Duluth, MN (SCF 556)275

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