 The per capita income for the city was $21,938.About 4.2% of families and 5.2% of the population were below the poverty line, including 6.0% of those under age 18 and 8.4% of those age 65 or over.A large number of Schertz's population is connected with the military due to the presence of adjacent Randolph Air Force Base and nearby Fort Sam Houston and Lackland Air Force Base, which can result in some degree of population turnover due to the transient nature of military service.