ZIP Code Tabulation Area · North Dakota

ZIP Code 58631: Morton County, ND

ZIP Code 58631 (Morton County, North Dakota) has an estimated 953 residents in 447 households. The median household income is $58,036, the median home value is $133,100 and the median gross rent is $775/mo. Figures are U.S. Census Bureau American Community Survey 2020–2024 5-year estimates for the matching ZIP Code Tabulation Area.

American Community Survey 2020–2024 5-year estimates · Updated Oct 26, 2026

Some estimates have a large margin of error. 2 figures for this ZIP (bachelor's or higher, work from home) are marked with *. ACS figures come from a sample, and small areas have fewer responses, so treat these numbers as rough ranges.

Total population

953

Margin of error ±202

Median household income

$58,036

Margin of error ±$14,037

Median home value

$133,100

Margin of error ±$45,156

Median gross rent

$775/mo

Margin of error ±$143

Median age

52.8 yrs

Margin of error ±7.2 yrs

Mean travel time to work

30.7 min

Margin of error ±10.7 min

How ZIP 58631 compares with North Dakota and the U.S.

State and national figures are the Census Bureau's own estimates for those areas from the same ACS release, not averages of ZIP codes.

Median age

ZIP 5863152.8 yrsNorth Dakota35.9 yrsUnited States38.9 yrs

Median household income

ZIP 58631$58,036North Dakota$76,657United States$80,734

Per capita income

ZIP 58631$39,920North Dakota$43,389United States$44,673

Poverty rate

ZIP 586316.5%North Dakota10.8%United States12.5%

Unemployment rate

ZIP 586313.1%North Dakota2.8%United States5.2%

Bachelor's degree or higher

ZIP 5863120.5%*North Dakota32.7%United States35.7%

Median home value

ZIP 58631$133,100North Dakota$249,900United States$332,700

Median gross rent

ZIP 58631$775/moNorth Dakota$954/moUnited States$1,413/mo

Owner-occupied homes

ZIP 5863184.3%North Dakota62.9%United States65.2%

Mean travel time to work

ZIP 5863130.7 minNorth Dakota17.9 minUnited States26.4 min

Worked from home

ZIP 5863118.6%*North Dakota8.1%United States15.1%

All figures for ZIP 58631

Each estimate has a 90% margin of error: the true value is likely within that range. * marks estimates with a large margin of error (a coefficient of variation above 30%, or ±10 percentage points or more for rates).

ZIP 58631 — ACS 2020–2024 5-year estimates
Measure	ZIP 58631	Margin of error	North Dakota	United States
Total population	953	±202	784,841	334,922,499
Median age	52.8 yrs	±7.2 yrs	35.9 yrs	38.9 yrs
Households	447	±99	331,063	129,227,496
Median household income	$58,036	±$14,037	$76,657	$80,734
Per capita income	$39,920	±$5,369	$43,389	$44,673
Poverty rate	6.5%	±4.2 pts	10.8%	12.5%
Unemployment rate	3.1%	±5.0 pts	2.8%	5.2%
Bachelor's degree or higher	20.5%*	±10.9 pts	32.7%	35.7%
Median home value	$133,100	±$45,156	$249,900	$332,700
Median gross rent	$775/mo	±$143	$954/mo	$1,413/mo
Owner-occupied homes	84.3%	±6.2 pts	62.9%	65.2%
Mean travel time to work	30.7 min	±10.7 min	17.9 min	26.4 min
Worked from home	18.6%*	±16.5 pts	8.1%	15.1%

Race and Hispanic or Latino origin

Shares of the total population by the Census Bureau's race and Hispanic or Latino origin categories (table B03002), listed in the Census Bureau's order. People self-identify on the survey.

Population by race and Hispanic or Latino origin, ZIP 58631
Group	ZIP 58631	North Dakota	United States
White alone, not Hispanic or Latino	91.5%	81.7%	57.4%
Black or African American alone, not Hispanic or Latino	0.0%	3.3%	11.9%
American Indian and Alaska Native alone, not Hispanic or Latino	0.3%	4.2%	0.5%
Asian alone, not Hispanic or Latino	0.4%	1.6%	5.9%
Native Hawaiian and Other Pacific Islander alone, not Hispanic or Latino	1.9%	0.1%	0.2%
Some other race alone, not Hispanic or Latino	0.0%	0.3%	0.6%
Two or more races, not Hispanic or Latino	3.7%	4.0%	4.3%
Hispanic or Latino (of any race)	2.2%	4.7%	19.3%

Where ZIP 58631 is

State: North Dakota
Main county: Morton County— also overlaps Grant County, Mercer County
Largest overlapping place: Glen Ullin (less than 1% of the ZIP's land area)
Land area: 370.33 sq mi· about 3 people per sq mi

County and place names come from the Census Bureau's 2020 ZCTA relationship files. A ZIP code's mailing city, set by the U.S. Postal Service, can differ from these names.

Other ZIP codes in Morton County

58520 Morton County, ND 58535 Morton County, ND 58554 Morton County, ND 58563 Morton County, ND 58566 Morton County, ND 58570 Morton County, ND 58638 Morton County, ND

See every ZIP code in North Dakota, or compare ZIP 58631 with another ZIP code.

Census figures describe residents as a group and cannot tell you about any one home or street. For a specific address, check local government and housing records.

About ZIP codes and ZCTAs: the Census Bureau publishes statistics for ZIP Code Tabulation Areas, which approximate USPS ZIP code delivery areas. Learn how they differ.

Sources

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, detailed tables B01003, B01002, B11001, B19013, B19301, B17001, B23025, B15003, B25077, B25064, B25003, B08013, B08303, B08301, B03002 — snapshot Oct 26, 2026.
U.S. Census Bureau, 2020 ZCTA5 relationship files (county and place).
Data: U.S. Census Bureau, American Community Survey 5-year estimates (detailed tables) and 2020 Census ZCTA relationship files. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau. These agencies do not endorse OpenZIP.