Portland is a city in Ionia County of the U.S. state of Michigan. As of the 2000 census, the city population was 3,789. The city is situated in the south central portion of Portland Township, but is administratively autonomous.
According to the United States Census Bureau, the city has a total area of 2.5 square miles (6.5 km²), of which, 2.4 square miles (6.2 km²) of it is land and 0.1 square miles (0.3 km²) of it (4.76%) is water.
As of the census of 2000, there were 3,789 people, 1,507 households, and 1,054 families residing in the city. The population density was 1,577.7 per square mile (609.6/km²). There were 1,574 housing units at an average density of 655.4 per square mile (253.2/km²). The racial makeup of the city was 97.68% White, 0.50% African American, 0.24% Native American, 0.18% Asian, 0.34% from other races, and 1.06% from two or more races. Hispanic or Latino of any race were 1.32% of the population.