:there is another town of waterloo in grant county.  waterloo is a town in jefferson county in the u.s. state of wisconsin. the population was 909 at the 2010 census. the city of waterloo is located within the town. the unincorporated community of portland is also located partially in the town. ==geography== according to the united states census bureau, the town has a total area of 32.3&nbsp;square miles (83.7&nbsp;kmÂ²), all land. ==demographics== as of the census of 2000, there were 832 people, 299 households, and 238 families residing in the
Towns_in_Jefferson_County,_Wisconsin Towns_in_Wisconsin