Eva's deer mouse occurs on Mexico's Baja California Peninsula and Carmen Island. Its coat varies, and the island population is darker.
The coat varies from ocherous buff to russet and brown. The belly is white and the face grayish. The Carmen Island population is darker than the peninsular population.
It occurs in arid tropical scrub and secondary vegetation, and has also been recorded in fields and crops. It is associated with areas containing succulents such as cacti.
An extinction-risk assessment has not been added yet.