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city, Sonoma county, western California, U.S. It lies at the head of navigation on the Petaluma River, 39 miles (63 km) north of San Francisco. The area was once part of Rancho Petaluma, granted to Mexican General Mariano Guadalupe Vallejo in 1834. Founded in 1852, the city (like the rancho) derived its name from the Miwok Indian words pe'ta: "flat" and lu'ma: "back." Following the California Gold Rush (1849), the city became an important source of food for the cities of San Francisco and Oakland. The poultry and egg industry, dairying, and winemaking are foremost commercial activities, supplemented by light manufactures (notably processing machinery and fishing tackle), high-technology and telecommunications firms, and tourism. Local attractions include Garden Valley Ranch, which features several thousand rose bushes, and the Petaluma Wildlife and Natural Science Museum. The Petaluma Adobe State Historic Park (c. 1836), which contains Vallejo's restored home, is nearby. Inc. town, 1858; city, 1884. Pop. (1990) 43,184; (2000) 54,548.