[4] The city was originally called Carpenter's Store; the town site was platted and present name adopted when the railroad was extended to that point.

[4] A post office called Carpenters Store was established in 1858, and the name was changed to Trimble in 1899.

Smithville Lake on the Little Platte River lies one mile to the east.

[6] According to the United States Census Bureau, the city has a total area of 0.50 square miles (1.29 km2), all land.

28.6% of all households were made up of individuals, and 6.7% had someone living alone who was 65 years of age or older.

The racial makeup of the city was 97.56% White, 0.44% African American, 0.89% Asian, and 1.11% from two or more races.

34.6% of all households were made up of individuals, and 18.1% had someone living alone who was 65 years of age or older.