Hilmar-Irwin is a census-designated place (CDP) in Merced County, California, United States.

According to the United States Census Bureau, the CDP has a total area of 3.9 square miles (10 km2), all of it land.

Hilmar-Irwin has hot, mostly dry summers and cool, wet winters.

The racial makeup of Hilmar-Irwin was 4,475 (86.1%) White, 15 (0.3%) African American, 23 (0.4%) Native American, 87 (1.7%) Asian, 1 (0.0%) Pacific Islander, 439 (8.4%) from other races, and 157 (3.0%) from two or more races.

3,672 people (70.7% of the population) lived in owner-occupied housing units and 1,525 people (29.3%) lived in rental housing units.

There were 1,646 housing units at an average density of 420.1 per square mile (162.2/km2).

The racial makeup of the CDP was 77.93% White, 0.35% Black or African American, 0.33% Native American, 2.39% Asian, 6.59% from other races, and 12.40% from two or more races.

In the state legislature, Hilmar-Irwin is located in the 12th Senate District, represented by Republican Anthony Cannella, and in the 21st Assembly District, represented by Democrat Adam Gray.

[7] 2012 Citizen Redstricting: Hilmar will now belong to CA State Assembly District 21.