Water Valley, KY has a population of 253 and is the 23,358th largest city in the United States. The population density is 474 per sq mi which is 337% higher than the Kentucky average and 423% higher than the national average. The median age in Water Valley is 49 which is approximately 27% higher than the Kentucky average of 39. In Water Valley, 61% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 53% of Water Valley residents were born in Kentucky, 45% were born out of state, 1% were born outside of the United States and 0% were foreign born.