california's 1st congressional district is a congressional district in the u.s. state of california. the district is represented by republican doug lamalfa since 2013. before lamalfa has taken office, the district had not had a republican congressman since 1998. the district is made up of the counties: butte county, lassen county, modoc county, plumas county, shasta county, sierra county, siskiyou county, tehama county, most of nevada county, part of glenn county and part of placer county.