Spizella pusilla, commonly known as the Field Sparrow, is native to North America. Its geographical distribution primarily includes the eastern and central parts of the United States, extending into parts of southern Canada. There are some populations that reside in the Midwest and Northeast regions year-round, while others migrate to the southeastern United States during the winter months.

The Field Sparrow typically inhabits open and semi-open areas with sparse vegetation, such as grasslands, shrublands, and early successional fields. They are often found in overgrown pastures, forest edges, and areas with scattered bushes and trees. These areas provide adequate cover and foraging opportunities.

As granivores, Field Sparrows predominantly feed on seeds, which constitute a large part of their diet throughout the year. Insects and other invertebrates are also consumed, particularly during the breeding season when protein demand is higher. Their foraging behavior plays a role in seed dispersal and pest control, contributing to the ecological balance of their habitat.