Yreka, Eureka, CHICO, Petaluma, and Santa Rosa are all cities located in Northern California. Yreka is a small city with a population of about 8, 500 people, located in Siskiyou County. Eureka is the largest coastal city in the region, with a population of over 27, 000 people. CHICO is a city in Butte County with a population of over 90, 000 people. Petaluma is a city in Sonoma County with a population of over 60, 000 people. Santa Rosa is the largest city in Sonoma County, with a population of over 175, 000 people. All of these cities are located in Northern California and offer a variety of activities and attractions for visitors.