ZIP codes

ZIP codes in Cass County, North Dakota

Cass County has 30 ZIP codes. 18 lie entirely inside it and 12 are shared with neighboring counties, so part of their land and their people are elsewhere. About 193,644 people live in the parts inside it (ACS 2020–2024).

By the All Map Tools Team

ZIP codes: 30; With 1% or more of their land inside
Entirely inside: 18; 99% or more of their land
Shared with other counties: 12; Most with Barnes County (5)
Most populated ZIP: 58104; 49,168 people · Fargo
Least populated ZIP: 58002; 17 people
Largest ZIP by land: 58064; 176 sq mi · Page

Map of the ZIP codes in Cass County

Entirely in the county (99% or more of its land)
Shared, mostly in this county
Shared, mostly in other counties
Neighboring counties

Open in the interactive tool

Each area is a ZIP code with its number where it fits. Hover over one to see its name.

All ZIP codes in Cass County

30 ZIP codes in Cass County, ND, by number
ZIP code	Main city	Population	Land in the county	Residents in the county
58002	—	17	100%	17
58004	Amenia	241	100%	241
58005	Argusville	898	100%	898
58006	Arthur	573	100%	573
58007	Ayr	81	100%	81
58011	Buffalo	449	100%	449
58012	Casselton	3,049	100%	3,049
58021	Horace	584	100%	584
58027	Enderlin	1,530	41%	≈ 606
58029	Erie	88	100%	88
58031	Alice	301	54%	≈ 176
58035	Galesburg	212	34%	≈ 104
58036	Gardner	360	100%	360
58038	Grandin	179	40%	≈ 103
58042	Harwood	1,344	100%	1,344
58046	Hope	645	1.7%	≈ 14
58047	Horace	5,636	97%	≈ 5,627
58048	Hunter	505	76%	≈ 438
58051	Kindred	1,980	59%	≈ 1,496
58052	Leonard	529	56%	≈ 337
58059	Mapleton	1,670	100%	1,670
58064	Page	332	74%	≈ 258
58068	Sheldon	134	1.8%	≈ 1
58071	Tower City	486	56%	≈ 294
58078	West Fargo	40,631	100%	40,631
58079	Wheatland	504	100%	504
58102	Fargo	32,912	100%	32,912
58103	Fargo	48,796	100%	48,796
58104	Fargo	49,168	100%	49,168
58105	Fargo	2,825	100%	2,825

ZIP codes shared with other counties

These 12 ZIP codes have part of their land in another county. The first figure is the share of their land in Cass County; then, where the rest lies.

58027 (Enderlin): 41% here; 45% in Ransom County and 14% in Barnes County.
58031 (Alice): 54% here; 46% in Barnes County.
58035 (Galesburg): 34% here; 42% in Traill County and 24% in Steele County.
58038 (Grandin): 40% here; 60% in Traill County.
58046 (Hope): 1.7% here; 85% in Steele County and 13% in Barnes County.
58047 (Horace): 97% here; 2.6% in Richland County.
58048 (Hunter): 76% here; 24% in Traill County.
58051 (Kindred): 59% here; 41% in Richland County.
58052 (Leonard): 56% here; 33% in Richland County and 11% in Ransom County.
58064 (Page): 74% here; 24% in Barnes County and 1.7% in Steele County.
58068 (Sheldon): 1.8% here; 98% in Ransom County.
58071 (Tower City): 56% here; 44% in Barnes County.

Cities and prefixes

By main city (the city, town or CDP each ZIP shares the most land with), the ones with the most are Fargo (4), Horace (2), Alice (1), Amenia (1), Argusville (1), and Arthur (1); 25 places in all.

They start with 2 different three-digit prefixes, one per USPS sorting center: 580 and 581.

Neighboring counties

Each one with its ZIP codes. Those without a page of their own open in the tool.

Tools for this county

ZIP codes by county or city The same ZIP codes on an interactive map, with the list as CSV or to copy County map with cities Its cities, towns and CDPs with their population ZIP codes in a radius The ZIP codes within 10 miles of its center, or any distance you like

Sources

U.S. Census Bureau, 2020 ZCTA to County, ZCTA to Place and ZCTA to Census Tract Relationship Files (and the 2022 County Subdivision to ZCTA file for Connecticut). Public domain.
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, table B01003 (population of each ZIP code, census tract and Connecticut town). Public domain.
U.S. Census Bureau, Vintage 2025 Population Estimates (county population) and 2025 Gazetteer Files (land area and interior point of each ZIP code). Public domain.
U.S. Census Bureau, Cartographic Boundary Files: ZCTAs 2020 and counties 2025, 1:500,000; county adjacency file 2025. Public domain.

How we count. ZIP codes here are the Census Bureau’s ZIP Code Tabulation Areas (ZCTAs), the areas it draws to match USPS ZIP codes; ZIPs with no area of their own (PO boxes, single buildings) aren’t included. A ZIP can cross county lines: “Land in the county” is the exact share of its land inside, from the Census relationship files. “Residents in the county” is the whole ZIP for those entirely inside; for shared ones it’s an estimate, spreading the people of each census tract over the land it shares with the ZIP. Population: ACS 2020–2024. Methodology.

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