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County ZIP codes · North Dakota · FIPS 38105

Williams County, ND ZIP Codes

Williams County, North Dakota has 12 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 10 residential and 2 for PO boxes or a single organization. 9 of the residential ones lie mainly in Williams County and 1 mainly in a neighboring county; 6 cross the county line.

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Williams County?

58755 · McGregor: $139k58795 · Wildrose: $117k58801 · Williston: $85k58830 · Alamo: $54k58843 · Epping: $119k58845 · Grenora: $92k58849 · Ray: $82k58852 · Tioga: $81k58853 · Trenton: $108k58856 · Zahl: $105k5880158849588435885258830588455885658795587555885358755 · McGregor: $139k58795 · Wildrose: $117k58801 · Williston: $85k58830 · Alamo: $54k58843 · Epping: $119k58845 · Grenora: $92k58849 · Ray: $82k58852 · Tioga: $81k58853 · Trenton: $108k58856 · Zahl: $105k5880158849588435885258830588455885658795587555885358755 · McGregor: $139k58795 · Wildrose: $117k58801 · Williston: $85k58830 · Alamo: $54k58843 · Epping: $119k58845 · Grenora: $92k58849 · Ray: $82k58852 · Tioga: $81k58853 · Trenton: $108k58856 · Zahl: $105k5880158849588435883058845588565879558755
The residential ZIP codes of Williams 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 10 residential ZIP codes in Williams County

9 ZIP codes lie mainly in Williams County; 1 more reaches into it from a neighboring county and follows the first table.

Residential ZIP codes mainly in Williams County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
58801 Williston 34,277 48 $85k $298k 100%
58852 Tioga 2,087 7 $81k $209k 79%
58849 Ray 1,101 4 $82k $270k 100%
58843 Epping 676 3 $119k $363k 100%
58845 Grenora 584 2 $92k – 51%
58853 Trenton 354 24 $108k $311k 100%
58856 Zahl 211 1 $105k – 66%
58755 McGregor 133 1 $139k $96k 44%
58830 Alamo 66 0 $54k $163k 60%

Partly in Williams County

Residential ZIP codes mainly in another county that reach at least 1% into Williams County, by their share here
In this county
58795 Wildrose 414 2 $117k $149k 46%

Download the 12 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?

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

Share of each ZIP code's land in Williams County and in the neighboring counties
ZIPIn WilliamsElsewhere
5885279%Mountrail County 21%
5884551%Divide County 49%
5879546%Divide County 54%
5885666%Divide County 34%
5875544%Divide County 43%; Burke County 13%
5883060%Divide County 40%

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

PO Box and single-organization ZIP codes

ZIP codes in Williams County without a residential area (GeoNames postal codes)
ZIPPostal name
58802Williston
58803Williston

Source: GeoNames postal codes (CC BY 4.0).

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Williams County's ZIP codes use 2 prefixes: 587 and 588.

Three-digit prefixes of Williams 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 Williams County's
PrefixSectional centerHereAll codes
587 Bismarck, ND (SCF 585) 2 64
588 Bismarck, ND (SCF 585) 10 17

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