Some 85% of schools which took part in the survey in the Big Schools Birdwatch saw blackbirds, with an average of five birds seen per school, slightly down on 2013 figures.
Starlings held onto the number two spot, but carrion crows moved up two places from fifth to third. Carrion crows were spotted at more than half of all schools.
More than 70,000 pupils and teachers counted birds for one hour of one day between January 20 and February 14. Their sightings contribute to the results of RSPB's annual Big Garden Birdwatch, which will be revealed on March 27.