 The district stretches along the eastern edge of the state from the Oregon border to Lake Tahoe, wrapping around the Sacramento Valley along the northern Sierra Nevada.The district is primarily rural and heavily Republican.Butte County – "9.0%"

All of Lassen County

All of Modoc County

All of Nevada County

Placer County – "16.7%"

All of Plumas County

All of Shasta County

All of Sierra County

All of Siskiyou County
Due to redistricting, the 1st district has been moved around different parts of the state.