Residential delivery area · Iowa
ZIP Code 51056: Smithland, IA
ZIP code 51056 uses the postal name Smithland, Iowa and lies mostly in Woodbury County (85% of its land) with the rest in Monona County (Census 2020 ZIP-county file). About 350 people live there (Census Bureau, ACS 2020-2024). Median household income is $103,313 (Census Bureau, ACS 2020-2024). By Census place, 1% of its land lies in Smithland; 99% is outside any Census place.
- ACS2020-24
- Census2020
- ZBP2023
- IRS2022
- Town
- Smithland · its only residential ZIP
- County
- Woodbury County (85%); Monona County (15%)
- Census places
- Smithland
- Metro area
- Sioux City, IA-NE-SD
- House district
- IA-4 119th Congress
- State
- Iowa
- Time zone
- Central
- Land area
- 33.6 sq mi · 10 people per sq mi
Where is ZIP code 51056?
51056 centers on 42.241°, -95.956° and covers 33.6 square miles of land plus 0.1 of water. It borders 5 ZIP codes: 51051, 51044, 51026, 51010, 51034.
The map draws ZIP code areas only. For the streets inside 51056, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 51056 compare with the rest of Woodbury County?
| Measure | 51056 | In Woodbury County | In IA |
|---|---|---|---|
| People (ACS 2020-2024) | 346 | 23rd of 26 | 771st of 970 |
| Median household income | $103k | not ranked | not ranked |
| Median home value | $157k | not ranked | not ranked |
51056's income and home value are not ranked: it has fewer than 1,000 residents (346). Rankings use ZIP codes of 1,000 or more people living in households, with margins at most 25% of the figure.
It is denser than 17% of U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 51056?
The 2020 Census counted 404 people in 51056; the ACS, which samples households over 2020-2024, estimates 346. Between the 2010 and 2020 censuses its population fell 15.5% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 346±105 (90% margin)
- 2020 Census count
- 404−15.5% since 2010 (478)
- Households
- 173
- Median age
- 54.7
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 51056?
Of the 346 people the ACS estimates in 51056, 11.3% are under 18 and 31.2% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (89.3%).
- Under 1811.3%
- 18 to 6457.5%
- 65 and older31.2%
- White, not Hispanic89.3%
- Other or two or more6.6%
- Hispanic or Latino3.2%
- Asian, not Hispanic0.9%
- Black, not Hispanic0.0%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 51056 earn?
Median household income is $103,313 (ACS 2020-2024). It rose from $65,951 in 2015-2019 (in 2024 dollars), a change larger than the surveys' margins of error.
- Median household income
- $103,313±$25,137
- Income per person
- $49,630
- Below the poverty line
- 12.4%
- Unemployed (of the labor force)
- 0.9%
- Adults 25+ with a bachelor's degree
- 22.2%
- Adjusted gross income per tax return, 2022
- $73,615200 returns; wages 60% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 51056?
- Median home value (owners' estimate)
- $157,400
- Median gross rent
- $658
- Homes owned by their occupants
- 92.5%
- Housing units
- 190
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001).
What businesses are in 51056?
8 business establishments had a location in this ZIP code in 2023, 2 more than in 2018; the most are in retail trade (ZIP Code Business Patterns).
- Retail trade3
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 51056?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 51051 | Rodney | 39 | $52k | 2.5 mi |
| 51044 | Oto | 165 | $90k | 4.9 mi |
| 51026 | Hornick | 910 | $81k | 5.8 mi |
| 51010 | Castana | 425 | $89k | 10.0 mi |
| 51034 | Mapleton | 1,674 | $66k | 10.1 mi |
| 51015 | Climbing Hill | 45 | $88k | 9.3 mi (near) |
| 51004 | Anthon | 858 | $44k | 9.8 mi (near) |
| 51019 | Danbury | 448 | $75k | 12.3 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.