Plain

County ZIP codes · Montana · FIPS 30083

Richland County, MT ZIP Codes

Richland County, Montana has 9 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 5 of the residential ones lie mainly in Richland County and 4 mainly in a neighboring county; 7 cross the county line. Median household income ranges from $45,379 in 59255 (Poplar) to $72,630 in 59270 (Sidney) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Richland County?

59213 · Brockton: $63k59217 · Crane: $79k59218 · Culbertson: $99k59221 · Fairview: $77k59243 · Lambert: $84k59255 · Poplar: $45k59259 · Richey: $83k59262 · Savage: $76k59270 · Sidney: $73k592705925559259592185921359243592625922159213 · Brockton: $63k59217 · Crane: $79k59218 · Culbertson: $99k59221 · Fairview: $77k59243 · Lambert: $84k59255 · Poplar: $45k59259 · Richey: $83k59262 · Savage: $76k59270 · Sidney: $73k592705925559259592185921359243592625922159213 · Brockton: $63k59217 · Crane: $79k59218 · Culbertson: $99k59221 · Fairview: $77k59243 · Lambert: $84k59255 · Poplar: $45k59259 · Richey: $83k59262 · Savage: $76k59270 · Sidney: $73k5927059255592595921859213592435926259221
The residential ZIP codes of Richland 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?

They carry 9 postal town names.

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

All 9 residential ZIP codes in Richland County

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

Residential ZIP codes mainly in Richland County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
59270 Sidney 8,571 10 $73k $268k 60%
59221 Fairview 1,951 7 $77k $244k 85%
59262 Savage 737 2 $76k $278k 57%
59243 Lambert 446 1 $84k $335k 100%
59217 Crane 171 46 $79k $224k 100%

Partly in Richland County

Residential ZIP codes mainly in another county that reach at least 1% into Richland County, by their share here
In this county
59218 Culbertson 898 2 $99k $248k 50%
59259 Richey 345 1 $83k $130k 46%
59213 Brockton 758 2 $63k $85k 44%
59255 Poplar 3,083 4 $45k $92k 19%

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?

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

Share of each ZIP code's land in Richland County and in the neighboring counties
ZIPIn RichlandElsewhere
5927060%McKenzie County 40%
5925519%Roosevelt County 78%; McCone County 3%
5922185%McKenzie County 15%
5921850%Roosevelt County 50%
5921344%Roosevelt County 56%
5926257%Dawson County 43%
5925946%Dawson County 54%

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

Which first three digits do Richland 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 Richland County starts with 592.

Three-digit prefixes of Richland 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 Richland County's
PrefixSectional centerHereAll codes
592 Billings, MT (SCF 590) 9 41

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