The city has a population of 609 for the year 2000 census. The 1990 census reported a population of 634. The median age of Clarissa residents is 52.4 years old.

The average household size is 2.04 and the average family size is 2.77.

Clarissa reported 36 vacant housing units.

For more information on the census report you can check their website at:
http://www.census.gov.