Grundy County Post Offices

100 Center St
Galt, Missouri 64641

216 E Main St
Laredo, Missouri 64652

303 N 2nd St
Spickard, Missouri 64679

201 W 11th St
Trenton, Missouri 64683

Grundy County

There are 4 US Post Offices in Grundy County serving a total of 10,056 residents equating to 2,514 residents per post office. It's estimated that approximately 16,050 packages are handled across the 4 county post offices annually. Grundy County is a county located in the U.S. state of Missouri. As of the 2010 census, the population was 10,261. Its county seat is Trenton. The county was organized January 2, 1841, from part of Livingston County, Missouri and named after U.S. Attorney General Felix Grundy."