The Dalles, OR has a population of 15,276 and is the 2,790th largest city in the United States. The population density is 2,339 per sq mi which is 5806% higher than the Oregon average and 2481% higher than the national average. The median age in The Dalles is 40 which is approximately 3% higher than the Oregon average of 39. In The Dalles, 59% of the population over 15 years of age are married, 85% speak English and 13% speak Spanish. 53% of The Dalles residents were born in Oregon, 38% were born out of state, 2% were born outside of the United States and 7% were foreign born.