ZIP Code 51056 - Smithland Iowa
Overview
ZIP Code 51056 is located in Smithland Iowa. Portions of 51056 are also in Oto and Little Sioux Township (Woodbury County) and Oto Township. 51056 is entirely within Woodbury County. Regionally, 51056 is located in the Sioux City Area.
ZIP Code 51056 Quick Stats
| ZIP Code Name | Smithland |
| Primary County | Woodbury County |
| ZIP Code Type | Standard |
| Population (2022) | 464 |
| Area Code(s) | 712 |
| Current Time | CDT |
ZIP Code 51056 Map
51056 Demographics
51056 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 51056 is White. The current unemployment level in 51056 is 3.3%.
| Population | 464 |
| Population Growth Rate | 8.72% |
| Population Density | 16 People per Square Mile |
| Total Households | 251 |
| Median Household Income (2021) | $63,857 |
| Average Adjusted Gross Income (2021) | $153,550 |
| Current Unemployment Rate (May 2026) | 3.3% |
| Sales Tax Rate (2025) | 7% |
| Majority Race/Ethnicity | White - 75.7% |
51056 Race/Ethnicity Breakdown
| Race/Ethnicity | Total | Percentage |
|---|---|---|
| White | 349 | 75.7% |
| Black | 0 | 0% |
| Hispanic | 112 | 24.3% |
| Asian | 0 | 0% |
| Native American | 0 | 0% |
| Hawaiian/Pac. Islander | 0 | 0% |
51056 Educational Attainment Levels
| Highest Education Level | Total | Percentage |
|---|---|---|
| Less Than 1 Year of College | 40 | 11.56% |
| Bachelor Degree | 32 | 9.25% |
| High School Diploma | 116 | 33.53% |
| No High School Diploma | 11 | 3.18% |
| GED or Alternate | 20 | 5.78% |
| 1 or More Years of College | 74 | 21.39% |
| Associates Degree | 48 | 13.87% |
| Masters Degree | 5 | 1.45% |
| Professional Degree | 0 | 0% |
| Doctorate Degree | 0 | 0% |
51056 Geography
| Coordinates | 42.24628067, -95.9578476 |
| Adjacent ZIP Codes | |
| Cities/Towns in 51056 | |
| Region | Sioux City Area |
| Metropolitan/Micropolitan Stat Area | Sioux City, IA-NE-SD |
| Time Zone | Central Daylight Time |
| IANA Timezone | America/Chicago |
| Area | 29 Square Miles |
51056 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 | 47m - Western Loess Hills | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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