Gretna is a city in Sarpy County, Nebraska, United States.

[7] Advent of the village of Gretna on this new laid rail line was the cue for the exit of the nearby trading post of Forest City, which had existed since 1856.

In its day, Forest City, located 2.5 miles southwest of where Gretna now stands, was a flourishing and busy place, but it was doomed by the railroad which passed it by.

The only markers that exist today to show the site of old Forest City is the cemetery (Holy Sepulchre) which is located a little to the east of what was the center of activity in the settlement and the 1886 homestead originally owned by the Schnack Family and located on Schnack Acres at 234th St. Names that were prominent in the beginnings of Forest City were the families of Adolph Schnack, William Langdon, John Thomas and John Conner.

The name suggests Scotland's Gretna Green,[8] the ancestral county of some of the earliest settlers.

There were 2,103 housing units at an average density of 307.5 per square mile (118.7/km2).

31.5% of households consisted of individuals and 15.8% had someone living alone who was 65 years of age or older.

24.5% of all households were made up of individuals, and 10.1% had someone living alone who was 65 years of age or older.

23.5% of all households were made up of individuals, and 10.0% had someone living alone who was 65 years of age or older.

Gretna Public Schools has passed several bond issues to build new facilities.

[6] The city's education system dates back to 1898 with the construction of the first school building.

The Gretna Public Schools District was majorly consolidated in 1958 when it reached its present size of 70 square miles.