ZIP Code 51234

ZIP code 51234 is classified by USPS as a standard delivery area and covers roughly 129.4 square miles in Boyden, Sioux County, Iowa. The area is home to 1,268 residents, producing a population density of 10 people per square mile, and falls within the Chicago time zone. These USPS and Census boundary values drive every downstream statistic on this page, including the benchmarks that compare 51234 against Iowa and the nation.

On the economic side, the median household income for ZIP 51234 sits at $84,318 (10% above the Iowa average), while per-capita income is $34,801. The poverty rate stands at 9.8% and the unemployment rate at 0.3%. On housing, the median home value is $211,800 (21% above the state average) with median rent at $762 per month, and 90.5% of occupied units are owner-occupied, a direct signal of whether 51234 behaves more like a homeowner neighborhood or a renter-heavy ZIP.

Education and household profile round out the picture: 28.0% of adults hold a bachelor's degree or higher, the median age is 32.3, and the average commute is —. We also surface 4 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing Sioux County, so you can benchmark 51234 against its immediate geography rather than a national average alone. Every figure is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates, HUD Fair Market Rents, and FHFA Home Price Index data, no estimates, no proprietary scoring. Verify with HUD →