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County ZIP codes · Montana · FIPS 30043

Jefferson County, MT ZIP Codes

Jefferson 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 Jefferson County and 3 mainly in a neighboring county; 5 cross the county line. Median household income ranges from $60,437 in 59701 (Butte) to $129,891 in 59634 (Clancy) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Jefferson County?

59631 · Basin: –59632 · Boulder: $69k59634 · Clancy: $130k59635 · East Helena: $84k59638 · Jefferson City: $127k59701 · Butte: $60k59721 · Cardwell: $94k59752 · Three Forks: $87k59759 · Whitehall: $61k59752597015975959632597215963459631596355963859631 · Basin: –59632 · Boulder: $69k59634 · Clancy: $130k59635 · East Helena: $84k59638 · Jefferson City: $127k59701 · Butte: $60k59721 · Cardwell: $94k59752 · Three Forks: $87k59759 · Whitehall: $61k59752597015975959632597215963459631596355963859631 · Basin: –59632 · Boulder: $69k59634 · Clancy: $130k59635 · East Helena: $84k59638 · Jefferson City: $127k59701 · Butte: $60k59721 · Cardwell: $94k59752 · Three Forks: $87k59759 · Whitehall: $61k597525970159759596325972159634596315963559638
The residential ZIP codes of Jefferson 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 $60,571 and $83,740.

They carry 9 postal town names.

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

All 9 residential ZIP codes in Jefferson County

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

Residential ZIP codes mainly in Jefferson County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
59634 Clancy 5,521 22 $130k $554k 100%
59759 Whitehall 3,631 8 $61k $354k 61%
59632 Boulder 2,557 6 $69k $279k 100%
59638 Jefferson City 769 13 $127k – 100%
59721 Cardwell 423 2 $94k $790k 62%
59631 Basin 375 2 – $236k 100%

Partly in Jefferson County

Residential ZIP codes mainly in another county that reach at least 1% into Jefferson County, by their share here
In this county
59701 Butte 34,232 67 $60k $248k 47%
59635 East Helena 8,292 104 $84k $396k 36%
59752 Three Forks 5,404 13 $87k $461k 20%

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?

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

Share of each ZIP code's land in Jefferson County and in the neighboring counties
ZIPIn JeffersonElsewhere
5970147%Silver Bow County49%; Deer Lodge County5%
5963536%Lewis and Clark County38%; Broadwater County26%
5975220%Gallatin County62%; Broadwater County18%
5975961%Madison County32%; Silver Bow County7%
5972162%Madison County38%

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

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Jefferson County's ZIP codes use 2 prefixes: 596 and 597.

Three-digit prefixes of Jefferson 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 Jefferson County's
PrefixSectional centerHereAll codes
596Great Falls, MT (SCF 594)524
597Billings, MT (SCF 590)449

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