[2] Sarpy County is part of the Omaha-Council Bluffs, NE-IA Metropolitan Statistical Area.

Explored in 1805 by the Lewis and Clark expedition following the Louisiana Purchase of 1803 by the United States, this area was settled by European-American fur traders, adventurers, farmers, and finally, entrepreneurs.

All initially depended on the Missouri River as a main transportation corridor and source of water.

The county is named for Peter Sarpy,[4] an early fur trader at Fontenelle's Post in the Bellevue area in the 1840s.

[5] The Omaha people were forced onto a reservation in the 19th century, losing most of their land to the United States who then opened it for settlement by non-Native Americans who were U.S. citizens or immigrants from certain (mostly European) countries.

Fort Crook, the U.S. Army post south of Bellevue, was established in the 1890s and added Offutt Field in the 1920s.

Its Glenn L. Martin Bomber Plant produced over two thousand aircraft during World War II, including the notable B-29's Enola Gay and Bockscar.

Many license plates issued in Sarpy County featured the stacked format of the 59 code.

The county's terrain consists of low rolling hills, cut by several small gullies and drainages that move groundwater to one of these rivers.

By contract, the department is also responsible for enforcing the law within the city limits of Gretna and Springfield.

The Sheriff's Department has secondary responsibility for law enforcement within these three cities, providing essentials such as backup support.

Since 1964, only three Democrats - Barack Obama in 2008, Joe Biden in 2020, and Kamala Harris in 2024 have received at least 40 percent of the county's vote.

[20] Sarpy County is divided into the following divisions, called precincts, except for the City of Bellevue.