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County ZIP codes · North Dakota · FIPS 38031

Foster County, ND ZIP Codes

Foster County, North Dakota has 8 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 3 of the residential ones lie mainly in Foster County and 5 mainly in a neighboring county; 7 cross the county line. Median household income ranges from $51,042 in 58356 (New Rockford) to $89,097 in 58421 (Carrington) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Foster County?

58356 · New Rockford: $51k58421 · Carrington: $89k58426 · Courtenay: $91k58443 · Glenfield: $74k58445 · Grace City: $72k58455 · Kensal: $77k58464 · McHenry: $56k58484 · Sutton: $171k584215835658464584555842658443584455848458356 · New Rockford: $51k58421 · Carrington: $89k58426 · Courtenay: $91k58443 · Glenfield: $74k58445 · Grace City: $72k58455 · Kensal: $77k58464 · McHenry: $56k58484 · Sutton: $171k584215835658464584555842658443584455848458356 · New Rockford: $51k58421 · Carrington: $89k58426 · Courtenay: $91k58443 · Glenfield: $74k58445 · Grace City: $72k58455 · Kensal: $77k58464 · McHenry: $56k58484 · Sutton: $171k5842158356584645845558426584435844558484
The residential ZIP codes of Foster 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 8 postal town names: Carrington, New Rockford, Kensal, McHenry, Courtenay, Glenfield, Grace City, Sutton.

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

All 8 residential ZIP codes in Foster County

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

Residential ZIP codes mainly in Foster County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
58421 Carrington 2,969 7 $89k $171k 83%
58443 Glenfield 152 1 $74k $121k 100%
58445 Grace City 145 2 $72k $109k 65%

Partly in Foster County

Residential ZIP codes mainly in another county that reach at least 1% into Foster County, by their share here
In this county
58455 Kensal 336 2 $77k $159k 41%
58464 McHenry 270 2 $56k $111k 36%
58484 Sutton 93 2 $171k $129k 27%
58356 New Rockford 1,627 6 $51k $124k 6%
58426 Courtenay 170 1 $91k – 4%

Download the 8 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 Foster County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Foster County and in the neighboring counties
ZIPIn FosterElsewhere
5842183%Stutsman County 8%; Wells County 6%; Eddy County 3%
583566%Eddy County 81%; Wells County 13%
5845541%Stutsman County 59%
5846436%Eddy County 55%; Griggs County 10%
584264%Stutsman County 96%
5844565%Eddy County 35%
5848427%Griggs County 73%

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

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Foster County's ZIP codes use 2 prefixes: 583 and 584.

Three-digit prefixes of Foster 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 Foster County's
PrefixSectional centerHereAll codes
583 Grand Forks, ND (SCF 582) 1 50
584 Fargo, ND (SCF 580) 7 62

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