Runaway Bay, TX has a population of 1,647 and is the 12,153rd largest city in the United States. The population density is 654 per sq mi which is 575% higher than the Texas average and 622% higher than the national average. The median age in Runaway Bay is 48 which is approximately 41% higher than the Texas average of 34. In Runaway Bay, 72% of the population over 15 years of age are married, 90% speak English and 10% speak Spanish. 62% of Runaway Bay residents were born in Texas, 33% were born out of state, 1% were born outside of the United States and 3% were foreign born.