About 51056 - Smithland, Iowa
The ZIP code 51056 of Smithland falls within Iowa, the United States - a sparsely populated area by population. It sits within Woodbury County.
Census data puts the population of this ZIP code at 346 residents. That's below the Iowa average of about 3,313 people per ZIP code.
Population density runs around 4 people per sq. mile, making it a rural area.
Other ZIP code codes in Iowa serve areas such as Ankeny, Cedar Falls, Dubuque.