West Whittier-Los Nietos, CA has a population of 27,071 and is the 1,597th largest city in the United States. The population density is 10,746 per sq mi which is 4524% higher than the California average and 11761% higher than the national average. The median age in West Whittier-Los Nietos is 36 which is approximately 1% higher than the California average of 36. In West Whittier-Los Nietos, 50% of the population over 15 years of age are married, 35% speak English and 63% speak Spanish. 67% of West Whittier-Los Nietos residents were born in California, 6% were born out of state, 1% were born outside of the United States and 27% were foreign born.