- Waldon (Population: 5,133)
- Walnut (Population: 30,004)
- Walnut Creek (Population: 64,296)
- Walnut Park (Population: 16,180)
- Wasco (Population: 21,263)
- Waterford (Population: 6,924)
- Watsonville (Population: 44,265)
- Weaverville (Population: 3,554)
- Weed (Population: 2,978)
- Weedpatch (Population: 2,726)
- Weldon (Population: 2,387)
- West Athens (Population: 9,101)
- West Bishop (Population: 2,807)
- West Carson (Population: 21,138)
- West Compton (Population: 5,435)
- West Covina (Population: 105,080)
- West Hollywood (Population: 35,716)
- West Menlo Park (Population: 3,629)
- West Modesto (Population: 6,096)
- West Puente Valley (Population: 22,589)
- West Sacramento (Population: 31,615)
- West Whittier-Los Nietos (Population: 25,129)
- Westhaven-Moonstone (Population: 1,044)
- Westlake Village (Population: 8,368)
- Westminster (Population: 88,207)
- Westmont (Population: 31,623)
- Westmorland (Population: 2,131)
- Westwood (Population: 1,998)
- Wheatland (Population: 2,275)
- Whittier (Population: 83,680)
- Wildomar (Population: 14,064)
- Williams (Population: 3,670)
- Willits (Population: 5,073)
- Willow Creek (Population: 1,743)
- Willowbrook (Population: 34,138)
- Willows (Population: 6,220)
- Wilton (Population: 4,551)
- Winchester (Population: 2,155)
- Windsor (Population: 22,744)
- Winter Gardens (Population: 19,771)
- Winters (Population: 6,125)
- Winton (Population: 8,832)
- Wofford Heights (Population: 2,276)
- Woodacre (Population: 1,393)
- Woodcrest (Population: 8,342)
- Woodlake (Population: 6,651)
- Woodland (Population: 49,151)
- Woodside (Population: 5,352)
- Woodville (Population: 1,678)
- Wrightwood (Population: 3,837)
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