County ZIP codes · Montana · FIPS 30041

Hill County, MT ZIP Codes

Hill County, Montana has 9 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 7 of the residential ones lie mainly in Hill County and 2 mainly in a neighboring county; 5 cross the county line. Median household income ranges from $50,288 in 59521 (Box Elder) to $73,906 in 59523 (Chinook) (Census Bureau, ACS 2020-2024).

ACS2020-24
Census2020

Where are the ZIP codes of Hill County?

The residential ZIP codes of Hill 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?

59521 · $50k 59523 · $74k

They carry 9 postal town names.

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

All 9 residential ZIP codes in Hill County

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

Residential ZIP codes mainly in Hill County, largest first; "In this county" is the share of the ZIP's land in the county
						In this county
59501	Havre	12,243	9	$52k	$218k	96%
59521	Box Elder	3,529	12	$50k	$104k	82%
59525	Gildford	473	2	$48k	$94k	100%
59540	Rudyard	430	1	$74k	$131k	96%
59528	Hingham	249	1	$89k	$171k	100%
59530	Inverness	141	1	$62k	$192k	100%
59532	Kremlin	97	0	$58k	–	100%

Partly in Hill County

Residential ZIP codes mainly in another county that reach at least 1% into Hill County, by their share here
						In this county
59531	Joplin	351	1	$68k	$110k	27%
59523	Chinook	2,356	2	$74k	$218k	1%

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

Share of each ZIP code's land in Hill County and in the neighboring counties
ZIP	In Hill	Elsewhere
59501	96%	Blaine County 4%
59521	82%	Chouteau County 18%
59523	1%	Blaine County 99%
59540	96%	Chouteau County 4%
59531	27%	Liberty County 73%

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

Which first three digits do Hill 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 Hill County starts with 595.

Three-digit prefixes of Hill 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 Hill County's
Prefix	Sectional center	Here	All codes
595	Great Falls, MT (SCF 594)	9	23

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