Seven suburban Virginia students are among 1,500 winners of corporate-sponsored, four-year Merit scholarships and 23 students are among 1,800 winners of National Merit $1,000 scholarships.

The 1983 Merit Scholarship competition began 18 months ago when more than a million high school juniors in 18,600 high schools took a qualifying test. About 13,500 finalists competed for 5,300 scholarships.

Winners of college-sponsored, four-year Merit Scholarships are yet to be announced.

Winners of the corporate-sponsored scholarships are Paul A. Ferre of Reston, a student at Southlakes High School; Mary S. Fretts, Arlington, Yorktown High; Michael T. Grant, Fairfax, W.T. Woodson High; Richard M. Gross, Vienna, James Madison High; Emily S. Manning, Alexandria, Fort Hunt High; James S. Mattson, Annandale, Annandale High; and Charles E. Puskar III, Alexandria, T.C. Williams High.

Winners of the $1,000 scholarships are Tamara L. Abell of Centreville, from Chantilly High; Rebecca J. Baer, Reston, Southlakes High; Peter A. Donis, Reston, Southlakes High; Kirsten E. Dwyer, Alexandria, T.C. Williams High; Eric A. Engels, Springfield, West Springfield High; Matthew M.S. Evans, Alexandria, St. Stephen Episcopal School; Peter A. Grendler, Arlington, Washington-Lee High; Anastasia Homatidis, Williamsburg, Yorktown High School in Arlington; Deborah D. Klatt, Alexandria, J.E.B. Stuart High; Moon S. Lee, Alexandria, Hayfield Secondary School; Yoonsun Lee, Vienna, Oakton High; Paul P. Plucinsky, Burke, Bishop Ireton High; Deborah Porterfield, Alexandria, T.C. Williams High; Leslie C. Shannon, Reston, Herndon High; Nathan V. Stuart, Arlington, Northfield Mount Hermon in Northfield, Maine; Phyleen M. Stewart, McLean, National Cathedral School; Therese L. Stowell, McLean, Langley High; Janet M. Swisher, Arlington, Washington-Lee High; Susan E. Swithers, Annandale, Annandale High; Scott J. Swarts, Annandale, Annandale High; Leilani R. Tamura, Springfield, Lake Braddock Secondary School; Karen L. Tanner, Vienna, James Madison High; and Christina T. Uhlrich, Annandale, Annandale High.