ZIP Code 51331 - Arnolds Park Iowa
Overview
ZIP Code 51331 is located in Arnolds Park Iowa. Portions of 51331 are also in West Okoboji and Center Grove Township and Lakeville Township. 51331 is entirely within Dickinson County. Regionally, 51331 is located in the Sioux City Area.
ZIP Code 51331 Quick Stats
| ZIP Code Name | Arnolds Park |
| Primary County | Dickinson County |
| ZIP Code Type | Standard |
| Population (2022) | 1,017 |
| Area Code(s) | 712 |
| Current Time | CDT |
ZIP Code 51331 Map
51331 Demographics
51331 can be classified socioeconomically as Lower Middle Class class compared to other ZIP Codes in Iowa based on Median Household Income and Average Adjusted Gross Income. The majority race/ethnicity residing in 51331 is White. The current unemployment level in 51331 is 3.3%.
| Population | 1,017 |
| Population Growth Rate | -8.17% |
| Population Density | 347 People per Square Mile |
| Total Households | 567 |
| Percentage High Income Households | 3.7% |
| Median Household Income (2021) | $71,250 |
| Average Adjusted Gross Income (2021) | $545,440 |
| Current Unemployment Rate (May 2026) | 3.3% |
| Sales Tax Rate (2025) | 7% |
| Majority Race/Ethnicity | White - 97.92% |
51331 Race/Ethnicity Breakdown
| Race/Ethnicity | Total | Percentage |
|---|---|---|
| White | 988 | 97.92% |
| Black | 0 | 0% |
| Hispanic | 15 | 1.49% |
| Asian | 6 | 0.59% |
| Native American | 0 | 0% |
| Hawaiian/Pac. Islander | 0 | 0% |
51331 Educational Attainment Levels
| Highest Education Level | Total | Percentage |
|---|---|---|
| Less Than 1 Year of College | 64 | 7.69% |
| Bachelor Degree | 149 | 17.91% |
| High School Diploma | 272 | 32.69% |
| No High School Diploma | 9 | 1.08% |
| GED or Alternate | 17 | 2.04% |
| 1 or More Years of College | 143 | 17.19% |
| Associates Degree | 77 | 9.25% |
| Masters Degree | 75 | 9.01% |
| Professional Degree | 19 | 2.28% |
| Doctorate Degree | 7 | 0.84% |
51331 Geography
| Coordinates | 43.36211014, -95.12905121 |
| Adjacent ZIP Codes | |
| Cities/Towns in 51331 | |
| Region | Sioux City Area |
| Metropolitan/Micropolitan Stat Area | Spirit Lake, IA |
| Time Zone | Central Daylight Time |
| IANA Timezone | America/Chicago |
| Area | 3 Square Miles |
51331 Weather and Climate Data
| Plant Hardiness Zone | Zone 5a: -20F to -15F | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Average First Frost Date | October 1 - 10 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Average Last Frost Date | May 1 - 10 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Koppen-Geiger Climate Zone | Dfb - Humid Continental Mild Summer, Wet All Year | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Ecoregion | 47b - Des Moines Lobe | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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