The major streets are the following: Prospero Bovino, Avenida Patria.
In term of town halls you can find 1 location in the region (like "Municipalidad de Colonia Ayuí"). In term of police stations you can find 1 places (like "Comisaría Colonia Ayuí").
Are you looking for an apartment for sale/rent? Or interested by a house? You can check that on Zonaprop.
Closest cities