ZIP Code 52321 - Onslow Iowa
Overview
ZIP Code 52321 is located in Onslow Iowa. Portions of 52321 are also in Clay Township (Jones County) and Madison Township (Jones County) and Wyoming Township and Scotch Grove Township. 52321 is entirely within Jones County. Regionally, 52321 is located in the Cedar Rapids-Waterloo-Iowa City and Dubuque Area.
ZIP Code 52321 Quick Stats
| ZIP Code Name | Onslow |
| Primary County | Jones County |
| ZIP Code Type | Standard |
| Population (2022) | 458 |
| Area Code(s) | 563 |
| Current Time | CDT |
ZIP Code 52321 Map
52321 Demographics
52321 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 52321 is White. The current unemployment level in 52321 is 3.3%.
| Population | 458 |
| Population Growth Rate | 12.18% |
| Population Density | 15 People per Square Mile |
| Total Households | 220 |
| Median Household Income (2021) | $55,893 |
| Average Adjusted Gross Income (2021) | $155,750 |
| Current Unemployment Rate (May 2026) | 3.3% |
| Sales Tax Rate (2025) | 7% |
| Majority Race/Ethnicity | White - 93.52% |
52321 Race/Ethnicity Breakdown
| Race/Ethnicity | Total | Percentage |
|---|---|---|
| White | 462 | 93.52% |
| Black | 22 | 4.45% |
| Hispanic | 6 | 1.21% |
| Asian | 0 | 0% |
| Native American | 4 | 0.81% |
| Hawaiian/Pac. Islander | 0 | 0% |
52321 Educational Attainment Levels
| Highest Education Level | Total | Percentage |
|---|---|---|
| Less Than 1 Year of College | 57 | 17.48% |
| Bachelor Degree | 58 | 17.79% |
| High School Diploma | 121 | 37.12% |
| No High School Diploma | 0 | 0% |
| GED or Alternate | 8 | 2.45% |
| 1 or More Years of College | 30 | 9.2% |
| Associates Degree | 52 | 15.95% |
| Masters Degree | 0 | 0% |
| Professional Degree | 0 | 0% |
| Doctorate Degree | 0 | 0% |
52321 Geography
| Coordinates | 42.14281464, -90.97335815 |
| Adjacent ZIP Codes | |
| Cities/Towns in 52321 | |
| Region | Cedar Rapids-Waterloo-Iowa City and Dubuque Area |
| Metropolitan/Micropolitan Stat Area | Cedar Rapids, IA |
| Time Zone | Central Daylight Time |
| IANA Timezone | America/Chicago |
| Area | 30 Square Miles |
52321 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 | Dfa - Humid Continental Hot Summers | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Ecoregion | 47f - Rolling Loess Prairies | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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