The main post office in Lamar was placed on the National Register of Historic Places on January 22, 1986.

Prowers Country Welfare Housing is a complex of five buildings constructed by the Works Progress Administration in 1938–41. It was listed on the National Register of Historic Places in 2009.

The Prowers County Building, at 301 S. Main St. in Lamar, Colorado, was built in 1928. It was a work of Robert K. Fuller and of A.E.Danielson & Sons in Classical Revival style.

Paulsen Farm was added to the National Register of Historic Places on December 9, 1999.

The Holly SS Ranch Barn, at 407 West Vinson in Holly, Colorado, was built in 1879. It was listed on the National Register of Historic Places in 2004.

The Granada Bridge, on U.S. Route 385 (US 385) at milepost 97.32 in or near Granada, Colorado. It was listed on the National Register of Historic Places in 2002.

The Granada Bridge, on U.S. Route 385 (US 385) at milepost 97.32 in or near Granada, Colorado. It was listed on the National Register of Historic Places in 2002.

The Davies Hotel, at 122 N. Main in Lamar, Colorado, was built in 1902. It was listed on the National Register of Historic Places in 1978. 

The Lamar station is a train station in Lamar, Colorado served by Amtrak. It is served by Amtrak's Southwest Chief line.