In 1905 Aiken was renamed Melville when Millard County began plans to set up irrigation and a dam.

[4] People purchased land for 50 cents an acre as long as they agreed to develop a 40-acre lot.

[5][6] During World War II, after the attack on Pearl Harbor, tens of thousands of Japanese-Americans were gathered up and placed in 10 incarceration camps to protect military installations from espionage.

One of these camps, then called Central Utah Relocation Center, was located near Delta and filled with former residents of the San Francisco Bay Area.

[7] The Topaz Museum, located in Delta, works to preserve important sites at the relocation center and to provide information on the history of the camps.

[9] John Williams Gunnison was leading a federal surveying team near the Sevier Lake.

[citation needed] Materion's, formerly Brush Wellman, beryllium refining plant is located north of Delta in Millard County.

The plant is a mill and finishing facility for beryllium, a high-strength, lightweight metal alloy used in military, aerospace, and medical industries.

The ore for the plant is trucked from Materion's mine, located in the Topaz-Spor Mountains, 50 miles west, in Juab County.

Due to the dry climate in the Delta region, farmers can control the moisture content of the hay when it is baled.

Delta is home to the Lon and Mary Watson Cosmic Ray Center, the main staging area for the Telescope Array Project experiment.

Trilobite fossils are relatively common in the region west of Delta (part of the House Range's Wheeler Shale).

DSES was originally built in 1982 to accommodate the growth in population due to the construction of the Intermountain Power Plant.

Delta Early Childhood Center was created using two-thirds of the South Elementary building to accommodate preschool and kindergarten students in West Millard County.

DMS has a staff of 21 teachers, nine instructional assistants, and eleven additional support personnel.

[16] According to the 2013-2014 DHS report card Delta had 549 students enrolled from the grades 9th-12th and an 87% graduation rate.

The Snow Goose Festival occurs every winter as the geese migrating through Delta stop at Gunnison Bend Reservoir.

Each July 4, the Hinckley Lions Club sponsors a demolition derby at the Millard County Fairgrounds.