Hanford is one of approximately 30 cities in the state of California (out of 482) without a district (sales) tax. They all have a 7.25% tax rate.
Here are the others, in alphabetical order. (Source: California Department of Tax and Fee Administration)
Alturas (Modoc County)
Auburn (Placer County)
Biggs (Butte County)
California City (Kern County)
Camarillo (Ventura County)
Colfax (Placer County)
Dorris (Siskiyou County)
Etna (Siskiyou County)
Fillmore (Ventura County)
Fort Jones (Siskiyou County)
Gridley (Butte County)
Lemoore (Kings County)
Lincoln (Placer County)
Live Oak (Sutter County)
Loyalton (Sierra County)
Maricopa (Kern County)
Montague (Siskiyou County)
Moorpark (Ventura County)
Ojai (Ventura County)
Portola (Plumas County)
Redding (Shasta County)
Rocklin (Placer County)
Shafter (Kern County)
Shasta Lake (Shasta County)
Simi Valley (Ventura County)
Tehama (Tehama County)
Thousand Oaks (Ventura County)
Tulelake (Siskiyou County)
Willows (Glenn County)
Winters (Yolo County)
Yuba City (Sutter County)