Why do some cities start with Los?

Los is Spanish and means the. It is used in front of a plural, masculine noun, such as "Los chicos". Las also means the but is used in front of a plural, feminine noun, such as "Las chicas". El and la would be the singular forms of the in Spanish, respectively.

Not all cities are of English origin in English speaking countries or around the world. For example, there are hundreds of cities in the US with Spanish origin names. The largest would be Los Angeles, which truly means the angels in Spanish. Other examples include Las Vegas (the meadows), Los Banos (the bathrooms), Los Gatos (the cats), Los Fresnos (the ash), El Paso (the passage), El Segundo (the second), La Joya (the jewel), and La Puente (the bridge).