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County ZIP codes · Minnesota · FIPS 27071

Koochiching County, MN ZIP Codes

Koochiching County, Minnesota has 15 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 14 residential and 1 for PO boxes or a single organization. 11 of the residential ones lie mainly in Koochiching County and 3 mainly in a neighboring county; 7 cross the county line. Median household income ranges from $64,736 in 56649 (International Falls) to $87,750 in 56623 (Baudette) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Koochiching County?

55771 · Orr: $68k55772 · Nett Lake: –56623 · Baudette: $88k56627 · Big Falls: $37k56629 · Birchdale: $91k56639 · Effie: $31k56649 · International Falls: $65k56653 · Littlefork: $75k56654 · Loman: $51k56658 · Margie: –56660 · Mizpah: $65k56661 · Northome: $66k56668 · Ranier: $116k56669 · Kabetogama: $65k557715662756623566535666156649566295666956639566545666055771 · Orr: $68k55772 · Nett Lake: –56623 · Baudette: $88k56627 · Big Falls: $37k56629 · Birchdale: $91k56639 · Effie: $31k56649 · International Falls: $65k56653 · Littlefork: $75k56654 · Loman: $51k56658 · Margie: –56660 · Mizpah: $65k56661 · Northome: $66k56668 · Ranier: $116k56669 · Kabetogama: $65k557715662756623566535666156649566295666956639566545666055771 · Orr: $68k55772 · Nett Lake: –56623 · Baudette: $88k56627 · Big Falls: $37k56629 · Birchdale: $91k56639 · Effie: $31k56649 · International Falls: $65k56653 · Littlefork: $75k56654 · Loman: $51k56658 · Margie: –56660 · Mizpah: $65k56661 · Northome: $66k56668 · Ranier: $116k56669 · Kabetogama: $65k55771566275662356653566615664956629566695663956660
The residential ZIP codes of Koochiching 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 $64,736 and $74,583.

They carry 14 postal town names.

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

All 14 residential ZIP codes in Koochiching County

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

Residential ZIP codes mainly in Koochiching County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
56649 International Falls 8,825 31 $65k $154k 62%
56653 Littlefork 1,239 3 $75k $169k 100%
56661 Northome 895 2 $66k $194k 51%
56669 Kabetogama 264 1 $65k $272k 92%
56629 Birchdale 224 1 $91k $212k 100%
56668 Ranier 217 1,069 $116k $184k 100%
56660 Mizpah 193 1 $65k $152k 100%
56627 Big Falls 192 0 $37k $69k 100%
56654 Loman 109 1 $51k $254k 100%
55772 Nett Lake 77 374 – $157k 93%
56658 Margie no residents 0 – – 100%

Partly in Koochiching County

Residential ZIP codes mainly in another county that reach at least 1% into Koochiching County, by their share here
In this county
56639 Effie 359 1 $31k $220k 48%
55771 Orr 1,484 1 $68k $169k 28%
56623 Baudette 2,733 6 $88k $233k 17%

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?

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

Share of each ZIP code's land in Koochiching County and in the neighboring counties
ZIPIn KoochichingElsewhere
5664962%St. Louis County38%
5662317%Lake of the Woods County83%
5577128%St. Louis County72%
5666151%Itasca County43%; Beltrami County7%
5663948%Itasca County52%
5666992%St. Louis County8%
5577293%St. Louis County7%

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

PO Box and single-organization ZIP codes

ZIP codes in Koochiching County without a residential area (GeoNames postal codes)
ZIPPostal name
56679South International Falls

Source: GeoNames postal codes (CC BY 4.0).

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Koochiching County's ZIP codes use 2 prefixes: 557 and 566.

Three-digit prefixes of Koochiching 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 Koochiching County's
PrefixSectional centerHereAll codes
557Duluth, MN (SCF 556)275
566St Paul, MN (SCF 550)1353

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