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County ZIP codes · Montana · FIPS 30027

Fergus County, MT ZIP Codes

Fergus County, Montana has 11 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 9 of the residential ones lie mainly in Fergus County and 2 mainly in a neighboring county; 6 cross the county line.

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Fergus County?

59032 · Grass Range: $42k59418 · Buffalo: –59424 · Coffee Creek: $79k59430 · Denton: $77k59441 · Forest Grove: $62k59451 · Hilger: $86k59453 · Judith Gap: $59k59457 · Lewistown: $65k59464 · Moore: $57k59471 · Roy: $65k59489 · Winifred: $65k594575947159032594305948959453594645945159441594185942459032 · Grass Range: $42k59418 · Buffalo: –59424 · Coffee Creek: $79k59430 · Denton: $77k59441 · Forest Grove: $62k59451 · Hilger: $86k59453 · Judith Gap: $59k59457 · Lewistown: $65k59464 · Moore: $57k59471 · Roy: $65k59489 · Winifred: $65k594575947159032594305948959453594645945159441594185942459032 · Grass Range: $42k59418 · Buffalo: –59424 · Coffee Creek: $79k59430 · Denton: $77k59441 · Forest Grove: $62k59451 · Hilger: $86k59453 · Judith Gap: $59k59457 · Lewistown: $65k59464 · Moore: $57k59471 · Roy: $65k59489 · Winifred: $65k5945759471590325943059489594535946459451594415941859424
The residential ZIP codes of Fergus 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).

All 11 residential ZIP codes in Fergus County

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

Residential ZIP codes mainly in Fergus County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
59457 Lewistown 9,135 9 $65k $242k 100%
59464 Moore 597 2 $57k $264k 95%
59430 Denton 448 1 $77k $211k 95%
59489 Winifred 424 1 $65k $188k 100%
59032 Grass Range 409 1 $42k $150k 77%
59471 Roy 318 0 $65k $178k 100%
59441 Forest Grove 126 1 $62k – 100%
59451 Hilger 123 1 $86k $214k 100%
59424 Coffee Creek 103 1 $79k $294k 67%

Partly in Fergus County

Residential ZIP codes mainly in another county that reach at least 1% into Fergus County, by their share here
In this county
59418 Buffalo 142 1 – – 23%
59453 Judith Gap 331 1 $59k $170k 19%

Download the 11 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 Fergus County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Fergus County and in the neighboring counties
ZIPIn FergusElsewhere
5946495%Judith Basin County 5%
5943095%Judith Basin County 5%
5903277%Petroleum County 23%
5945319%Wheatland County 77%; Judith Basin County 5%
5941823%Judith Basin County 77%
5942467%Judith Basin County 33%

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

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Fergus County's ZIP codes use 2 prefixes: 590 and 594.

Three-digit prefixes of Fergus 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 Fergus County's
PrefixSectional centerHereAll codes
590 Billings, MT (SCF 590) 1 75
594 Great Falls, MT (SCF 594) 10 64

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