Four Northern Virginia students excelled in this year's Talent Search conducted by The Johns Hopkins University. The search encourages seventh-graders who have scored in the top 3 percent on national ability tests to take the Scholastic Aptitude Test before the age of 13: Andrew Boyko of Hayfield Secondary School in Alexandria, whose mathematics score was Virginia's highest, and whose verbal score matching the state high earned by Rebecca Boggs of Arlington, who attends the National Cathedral School for Girls; Emily Kelly of H-B Woodlawn Secondary Program in Arlington, who placed second in the verbal portion, and Michael Puri of Longfellow Intermediate School in Falls Church, who placed second in mathematics.

Boyko earned top honors in the National Talent Search for his combined score on the math and verbal portions of the test.

This year 26,000 seventh-graders in 20 states took the SAT and 40 percent scored as well as or better than the average college-bound high school senior on at least one part of the test. Truman Award Candidate

Christine M. Murto of Annandale has been selected the Northern Virginia Community College representative in the competition for the 1986 Harry S Truman Scholarship. Murto's academic performance, commitment to government service and an essay on the Gramm-Rudman-Hollings Act contributed to her selection.

The Truman Foundation awards a scholarship to one student from each state who is a junior in college or beginning the junior year, and is pursuing a degree leading to a career in government or public service. Each college may submit two candidates who have at least a B average and are in the top 25 percent of the class. NOVA Honors Counselors

Northern Virginia Community College's Annandale Campus presented merit awards to counselors Joyce Hopson-King of Springfield and Debra Jacobs of Fairfax for their work in developing the 1985 High School Counselors Conference to display the academic opportunities NOVA offers.

Others receiving a merit award were: Pat Anderson of Fairfax for managing the student activities office during a vacancy in the coordinator's position; Mary Ann Lizondo of Annandale for her work in improving the campus bookstore operation; and Virginia Ward of Falls Church for her service in many leadership roles on the campus.

Merit awards are presented each year to individuals nominated by faculty, staff or students and selected by a committee. Retirees Elect Official

Henry Harper of Arlington was elected 2nd vice president of the National Association of Retired Federal Employees (NARFE) at its conference in Portsmouth, Va. Harper is a member of Arlington Chapter 7 of NARFE.