The olive sparrow is found primarily in Mexico and Central America. The northern portion of their range does stretch into southern Texas which is the only place in the United States where they can regularly be found.
They are a somewhat secretive bird which are usually found in dense under growth. Their preferred habitat consists of chaparral and thornscrub thickets.They eat a combination of seeds, insects and larvae, which it gleans from the undergrowth and ground.
Olive sparrows do not typically migrate. Their nesting season is from march to September. They build their nest low to the ground in a shrub or cactus. The nest is usually dome shaped and made from sticks, bark, grass and leaves. They usually lay from 2 to 5 eggs per year.