The urban structure includes approximately 70,268 residences (2001), even as the typical classic representation of family only includes 51,173 members in the municipality. The "extra" homes are primarily temporary residences, normally for students, migrant workers and professionals working in the city. There is, also, a great number of homes owned by Portuguese residents living overseas (who use the homes periodically while in Portugal) even as constant and development has attracted new growth in the population. Further, the difference in resident to transitory population means that, on average, the population of Braga hovers between 174,000 and 230,000 individuals annually.