Comparison to Surrounding Areas
The median household income ($58,036) for 58631 is less than the median household income for 58638 ($63,854), 58563 ($78,214), 58580 ($110,347), 58520 ($96,188), 58523 ($81,806), 58562 ($62,955), Morton County ($79,382), and Mercer County ($80,946). But it's more than 58533 ($36,125), 58646 ($56,667), Grant County ($57,875), and Glen Ullin city ($50,357).
| 58631 | $58,036 |
| Glen Ullin city | $50,357 |
| Grant County | $57,875 |
| Mercer County | $80,946 |
| Morton County | $79,382 |
Get Median Household Income for all Zip Codes in North Dakota.
The average household income ($81,594) for 58631 is less than the average household income for 58646 ($88,408), 58563 ($95,073), 58580 ($119,684), 58638 ($84,487), 58520 ($103,344), 58523 ($90,186), Mercer County ($96,779), Morton County ($109,606), and Grant County ($83,261). But it's more than 58533 ($69,215), 58562 ($73,184), and Glen Ullin city ($68,810).
| 58631 | $81,594 |
| Glen Ullin city | $68,810 |
| Grant County | $83,261 |
| Mercer County | $96,779 |
| Morton County | $109,606 |
Get Average Household Income for all Zip Codes in North Dakota.
The per-capita income for 58631 is $39,920. The per capita income ($39,920) for 58631 is less than the per capita income for 58580 ($52,330), 58646 ($44,441), Mercer County ($41,590), and Morton County ($46,235). But it's more than 58638 ($34,048), 58562 ($30,917), 58563 ($38,299), 58520 ($33,595), 58523 ($37,636), 58533 ($35,269), Grant County ($38,687), and Glen Ullin city ($35,457).
| 58631 | $39,920 |
| Glen Ullin city | $35,457 |
| Grant County | $38,687 |
| Mercer County | $41,590 |
| Morton County | $46,235 |
Get Per-Capita Income for all Zip Codes in North Dakota.
4.5% of households make over $200,000 a year. The percent high income households (4.5%) for 58631 is less than the percent high income households for 58646 (7.9%), 58533 (6.2%), 58563 (9.1%), 58580 (6.3%), 58520 (8.6%), 58523 (5.1%), Mercer County (6.8%), Morton County (7.8%), and Grant County (7.6%). But it's more than 58562 (2.9%) and Glen Ullin city (2.0%). And it's the same as 58638 (4.5%).
| 58631 | 4.5% |
| Glen Ullin city | 2.0% |
| Grant County | 7.6% |
| Mercer County | 6.8% |
| Morton County | 7.8% |
Get High Income Households for all Zip Codes in North Dakota.
| under 25 years | 25 to 44 years | 45 to 64 years | 65 years and over | |
|---|---|---|---|---|
| 58631 | $-1 | $94,531 | $78,000 | $32,313 |
| Glen Ullin city | $-1 | $88,750 | $85,208 | $31,958 |
| Grant County | $-1 | $65,750 | $78,462 | $37,625 |
| Mercer County | $-1 | $95,721 | $111,094 | $58,676 |
| Morton County | $28,476 | $100,234 | $94,183 | $55,529 |
Get Median Household Income by Age of Householder for all Zip Codes in North Dakota.
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All income statistics above are the most current, comparable income statistics available from the US Census Bureau and are from the American Community Survey 2024 5-year estimates. You can find this information and other demographics for 58631 on the US Census Bureau’s website. These values are in 2024 inflation-adjusted dollars and were downloaded on 29 January 2026.
Margins of error for the income data are:
| Median Household Income | Average Household Income | Per Capita Income | High Income Households | Median Household Income by Age of Householder | ||||
|---|---|---|---|---|---|---|---|---|
| under 25 | 25 to 44 | 45 to 64 | 65+ | |||||
| 58631 | +/-$14,037 | +/-$11,971 | +/-$5,369 | +/-2.7% | +/-$-1 | +/-$24,462 | +/-$25,471 | +/-$20,756 |
| Glen Ullin city | +/-$13,746 | +/-$11,105 | +/-$4,879 | +/-2.1% | +/-$-1 | +/-$26,064 | +/-$29,995 | +/-$11,717 |
| Grant County | +/-$12,632 | +/-$8,670 | +/-$3,592 | +/-2.1% | +/-$-1 | +/-$24,165 | +/-$10,900 | +/-$9,761 |
| Mercer County | +/-$6,419 | +/-$6,617 | +/-$2,468 | +/-2.1% | +/-$-1 | +/-$16,382 | +/-$13,522 | +/-$11,093 |
| Morton County | +/-$6,495 | +/-$12,264 | +/-$5,193 | +/-1.7% | +/-$18,455 | +/-$7,067 | +/-$9,336 | +/-$4,732 |