what county is constantia, ny in
Current Temperature Â° Population NR. Constantia is located in Oswego County, NY. The population is , making Constantia the 8th largest city in Oswego County. There are 1 public schools in Constantia with an average Homefacts rating of B. The total crime rate for Constantia is very low, and there are 5 registered sex offenders residing in the city.