Garrison, TX has a population of 987 and is the 15,254th largest city in the United States. The population density is 841 per sq mi which is 767% higher than the Texas average and 828% higher than the national average. The median age in Garrison is 38 which is approximately 11% higher than the Texas average of 34. In Garrison, 63% of the population over 15 years of age are married, 87% speak English and 10% speak Spanish. 86% of Garrison residents were born in Texas, 9% were born out of state, 0% were born outside of the United States and 5% were foreign born.