Answer
Uruguay is divided into 19 departments. Each has its own intendencia and an executive head, the intendente. Departments are responsible for a range of local procedures and services, so where you live affects not only your address but also vehicle registration, municipal fees, and certain permits.
Montevideo is both the capital of the country and a separate department. Punta del Este is in the department of Maldonado and Colonia del Sacramento is in the department of Colonia. The names of the city and department are easily confused when filling out the form.
Before contacting an institution, check which level of government is responsible for the matter: the national ministry, intendencia, or municipio. This helps you choose the right website, office, and address-verification requirements.