Classes resumed this week for students in Calvert County, and the new school year starts Monday in Charles and St. Mary's counties. Even though the pace of enrollment growth has slowed over the past couple of years, many schools remain crowded, and systems in all three counties continue to add buildings and staff members to accommodate the continuing increase in students.

CALVERT COUNTY PUBLIC SCHOOLS

* Schools: 22 total -- 12 elementary, 6 middle and 4 high schools; plus the career and technology center and the special education center.

* Enrollment: 17,056 students during the 2004-05 school year. Project enrollment for this year is 17,341, a 1.7 percent increase.

* Employees: 2,129 full-time, including 1,167 teachers.

CHARLES COUNTY PUBLIC SCHOOLS

* Schools: 32 total -- 19 elementary, 7 middle and 6 high schools.

* Enrollment: 26,026 students during the 2004-05 school year. Projected enrollment for this year is 26,485 students, a 1.1 percent increase. Over the past five years, enrollment has grown 11 percent.

* Employees: 3,096 full-time, including 2,165 teachers.

ST. MARY'S COUNTY PUBLIC SCHOOLS

* Schools: 25 total -- 16 elementary, 4 middle and 3 high schools; plus the Alternative Learning Center and the Dr. James A. Forrest Career and Technology Center.

* Enrollment: 16,408 students during the 2004-05 school year. Projected enrollment for this year 16,750 students, a 2 percent increase.

* Employees: 2,106 full-time, including 1,369 teachers and school administrators.

SOURCES: Central administration officials in each of the three school districts.