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County ZIP codes · Montana · FIPS 30097

Sweet Grass County, MT ZIP Codes

Sweet Grass County, Montana has 7 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 4 of the residential ones lie mainly in Sweet Grass County and 3 mainly in a neighboring county; 4 cross the county line.

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Sweet Grass County?

59011 · Big Timber: $78k59033 · Greycliff: $72k59052 · McLeod: $61k59055 · Melville: $164k59069 · Reed Point: $73k59078 · Shawmut: $27k59082 · Springdale: –59011590525906959078590555908259011 · Big Timber: $78k59033 · Greycliff: $72k59052 · McLeod: $61k59055 · Melville: $164k59069 · Reed Point: $73k59078 · Shawmut: $27k59082 · Springdale: –590115905259069590785905559011 · Big Timber: $78k59033 · Greycliff: $72k59052 · McLeod: $61k59055 · Melville: $164k59069 · Reed Point: $73k59078 · Shawmut: $27k59082 · Springdale: –5901159052590695907859055
The residential ZIP codes of Sweet Grass 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 7 residential ZIP codes in Sweet Grass County

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

Residential ZIP codes mainly in Sweet Grass County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
59011 Big Timber 3,167 3 $78k $328k 100%
59033 Greycliff 231 7 $72k – 100%
59052 McLeod 186 0 $61k $1.11M 59%
59055 Melville 40 0 $164k – 100%

Partly in Sweet Grass County

Residential ZIP codes mainly in another county that reach at least 1% into Sweet Grass County, by their share here
In this county
59069 Reed Point 458 1 $73k $409k 49%
59082 Springdale 2 0 – – 34%
59078 Shawmut 115 0 $27k $142k 8%

Download the 7 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 Sweet Grass County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Sweet Grass County and in the neighboring counties
ZIPIn Sweet GrassElsewhere
5906949%Stillwater County 51%
5905259%Park County 41%
590788%Wheatland County 69%; Golden Valley County 22%
5908234%Park County 66%

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

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Sweet Grass County starts with 590.

Three-digit prefixes of Sweet Grass 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 Sweet Grass County's
PrefixSectional centerHereAll codes
590 Billings, MT (SCF 590) 7 75

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