According to the United States Census Bureau, the city has a total area of 4.8 square miles (12 km2), all land.

Ecologically, Trumann is located within the St. Francis Lowlands ecoregion within the larger Mississippi Alluvial Plain.

The St. Francis Lowlands are a flat region with fertile soil mostly covered with row crop agriculture today, though also containing sand blows and sunken lands remaining from the 1811–12 New Madrid earthquakes.

[3] The St. Francis Sunken Lands Wildlife Management Area, which preserves some of the bottomland hardwood forest typical of this ecoregion prior to development for row agriculture lies east of Trumann along the St. Francis River.

As of the 2020 United States census, there were 7,399 people, 2,782 households, and 1,952 families residing in the city.

[7] On June 5, 2014, a derecho passed the through the town, causing extensive damage to trees and power lines.

The agriculture and service industries make up a large share of employment in Trumann.

[10] In 2005, the Parker Hannifin Company closed their facility which served automotive industry after more 20 years working in this City.

The production lines and processes were relocated to other Parker Hannifin site located in Apodaca Nuevo León Mexico.