Gretna. <1> City (2020 pop. 17,515), seat of Jefferson parish, SE La., on the Mississippi River. A suburb of New Orleans, it produces marble, granite, chemicals, and food products. Founded in the early 19th cent. as Mechanicsham, Gretna merged with McDonoghville in 1913. <2> City (2020 pop. 5,083), Sarby co., SE Nebr.; inc. 1889. The town was established when the Burlington railroad opened a station there, supplanting the bypassed Forest City as the center for commerce in the area. Eugne T. Mahoney State Park and the Ak-Sar-Ben Aquarium are located nearby.

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