Iron Horse is a census-designated place (CDP) in Plumas County, California, United States.

[3] According to the United States Census Bureau, the CDP has a total area of 7.7 square miles (20 km2), all of it land.

The racial makeup of Iron Horse was 276 (92.9%) White, 0 (0.0%) African American, 0 (0.0%) Native American, 1 (0.3%) Asian, 0 (0.0%) Pacific Islander, 12 (4.0%) from other races, and 8 (2.7%) from two or more races.

242 people (81.5% of the population) lived in owner-occupied housing units and 55 people (18.5%) lived in rental housing units.

There were 148 housing units at an average density of 16.1 per square mile (6.2/km2).

[6] Of the 122 households 33.6% had children under the age of 18 living with them, 69.7% were married couples living together, 7.4% had a female householder with no husband present, and 21.3% were non-families.

In the state legislature, Iron Horse is in the 1st Senate District, represented by Republican Megan Dahle,[7] and the 1st Assembly District, represented by Republican Heather Hadwick.

[8] Federally, Iron Horse is in California's 1st congressional district, represented by Republican Doug LaMalfa.