ADMINISTAFF ENTERS ST. LOUIS MARKET WITH 21st OFFICE; AGGRESSIVE EXPANSION PROGRAM ON PACE TOWARD 90 OFFICES IN 40 MARKETS

HOUSTON, April 20, 1998 – Administaff, Inc., a leading Professional Employer Organization (PEO), today announced its planned expansion into the St. Louis market, with its 21st sales office scheduled to open there on Monday, June 1, 1998.

The opening of the St. Louis office is a continuation of Administaff's planned national expansion program, which calls for establishing 90 offices in 40 markets. This is the third office opened in 1998 as part of a goal of opening four new offices each year.

St. Louis ranked 2nd in the United States in Entrepreneur magazine's listing of the top places for small business. This new office expands Administaff's presence to 13 markets, including Atlanta, Austin, Charlotte, Chicago, Dallas, Denver, Houston, Los Angeles, Orlando, Phoenix, San Antonio, and Washington, DC. Its St. Louis presence marks Administaff's second Midwestern location, complementing the company's Chicago district office.

``Our entry into the St. Louis market represents an opportunity to provide our comprehensive menu of human resource services to more than 22,000 small- and medium-sized business owners located in the greater metropolitan area,'' said Paul J. Sarvadi, Administaff president and chief executive officer.

``As the 17th largest metropolitan area in the U.S., St. Louis has a booming economy with more than 57,000 new jobs created since 1995. The city's current economic development plan projects 100,000 new jobs by the end of the year 2000,'' Sarvadi said. ``These factors make St. Louis a logical and ideal next move in our expansion program.''

Administaff's new office officially opens June 1, however, the company already serves three clients and 155 worksite employees in the area. The new sales office will be located at 700 Corporate Park Drive, Suite 360 in Clayton, Mo. For more information, call 800-575-2686.

Administaff had 1997 revenues of $1.2 billion. As one of the nation's leading PEOs, the company provides a comprehensive Personnel Management System that encompasses a broad range of services, including benefits and payroll administration, medical and workers' compensation insurance programs, personnel records management, employer liability management, employee recruiting and selection, performance management, and training and development services to small- and medium-sized businesses.

NOTE: The statements contained in this press release which are not historical facts are forward-looking statements that involve a number of risks and uncertainties. Therefore, the actual results of future events described in such forward-looking statements could differ materially from those stated in such forward-looking statements. Among the factors that could cause actual results to differ materially include regulatory and tax developments, competitive activities and increases in direct costs and operating expense, which are described in further detail in the Company's filings with the Securities and Exchange Commission.