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County ZIP codes · Montana · FIPS 30007

Broadwater County, MT ZIP Codes

Broadwater County, Montana has 7 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 6 residential and 1 for PO boxes or a single organization. 3 of the residential ones lie mainly in Broadwater County and 3 mainly in a neighboring county; 3 cross the county line. Median household income ranges from $68,811 in 59644 (Townsend) to $86,767 in 59752 (Three Forks) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Broadwater County?

59635 · East Helena: $84k59643 · Toston: $50k59644 · Townsend: $69k59645 · White Sulphur Springs: $77k59647 · Winston: –59752 · Three Forks: $87k59645596445975259643596475963559635 · East Helena: $84k59643 · Toston: $50k59644 · Townsend: $69k59645 · White Sulphur Springs: $77k59647 · Winston: –59752 · Three Forks: $87k59645596445975259643596475963559635 · East Helena: $84k59643 · Toston: $50k59644 · Townsend: $69k59645 · White Sulphur Springs: $77k59647 · Winston: –59752 · Three Forks: $87k5964559644597525964359635
The residential ZIP codes of Broadwater 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 $68,811 and $83,740.

They carry 6 postal town names: East Helena, Three Forks, Townsend, White Sulphur Springs, Toston, Winston.

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

All 6 residential ZIP codes in Broadwater County

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

Residential ZIP codes mainly in Broadwater County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
59644 Townsend 4,187 6 $69k $362k 100%
59643 Toston 867 3 $50k $355k 100%
59647 Winston 358 4 – $337k 100%

Partly in Broadwater County

Residential ZIP codes mainly in another county that reach at least 1% into Broadwater County, by their share here
In this county
59635 East Helena 8,292 104 $84k $396k 26%
59752 Three Forks 5,404 13 $87k $461k 18%
59645 White Sulphur Springs 1,611 1 $77k $288k 1%

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?

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

Share of each ZIP code's land in Broadwater County and in the neighboring counties
ZIPIn BroadwaterElsewhere
5963526%Lewis and Clark County 38%; Jefferson County 36%
5975218%Gallatin County 62%; Jefferson County 20%
596451%Meagher County 99%

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

PO Box and single-organization ZIP codes

ZIP codes in Broadwater County without a residential area (GeoNames postal codes)
ZIPPostal name
59641Radersburg

Source: GeoNames postal codes (CC BY 4.0).

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

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

Three-digit prefixes of Broadwater 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 Broadwater County's
PrefixSectional centerHereAll codes
596 Great Falls, MT (SCF 594) 6 24
597 Billings, MT (SCF 590) 1 49

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