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County ZIP codes · Montana · FIPS 30033

Garfield County, MT ZIP Codes

Garfield County, Montana has 9 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 6 of the residential ones lie mainly in Garfield County and 3 mainly in a neighboring county; 4 cross the county line.

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Garfield County?

59058 · Mosby: –59077 · Sand Springs: –59214 · Brockway: –59223 · Fort Peck: –59301 · Miles City: $71k59312 · Angela: $83k59318 · Brusett: $59k59322 · Cohagen: $51k59337 · Jordan: $75k59301593375905859077592145932259318592235931259058 · Mosby: –59077 · Sand Springs: –59214 · Brockway: –59223 · Fort Peck: –59301 · Miles City: $71k59312 · Angela: $83k59318 · Brusett: $59k59322 · Cohagen: $51k59337 · Jordan: $75k59301593375905859077592145932259318592235931259058 · Mosby: –59077 · Sand Springs: –59214 · Brockway: –59223 · Fort Peck: –59301 · Miles City: $71k59312 · Angela: $83k59318 · Brusett: $59k59322 · Cohagen: $51k59337 · Jordan: $75k5930159337590585907759214593225931859223
The residential ZIP codes of Garfield 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 9 residential ZIP codes in Garfield County

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

Residential ZIP codes mainly in Garfield County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
59337 Jordan 653 0 $75k $158k 100%
59318 Brusett 148 0 $59k $208k 100%
59322 Cohagen 132 0 $51k $167k 100%
59077 Sand Springs 71 0 – $261k 100%
59058 Mosby 54 0 – $250k 74%
59312 Angela 29 0 $83k – 100%

Partly in Garfield County

Residential ZIP codes mainly in another county that reach at least 1% into Garfield County, by their share here
In this county
59223 Fort Peck 19 0 – $446k 8%
59214 Brockway 46 0 – $300k 5%
59301 Miles City 11,643 4 $71k $218k 5%

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 Garfield County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Garfield County and in the neighboring counties
ZIPIn GarfieldElsewhere
593015%Custer County81%; Rosebud County10%; Powder River County2%; Prairie County1%
5905874%Petroleum County26%
592145%McCone County84%; Prairie County11%
592238%McCone County91%

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

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Garfield County's ZIP codes use 3 prefixes: 590, 592 and 593.

Three-digit prefixes of Garfield 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 Garfield County's
PrefixSectional centerHereAll codes
590Billings, MT (SCF 590)275
592Billings, MT (SCF 590)241
593Billings, MT (SCF 590)531

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