Reduce and Cap the Federal Workforce Act of 2010

Reduce and Cap the Federal Workforce Act of 2010 - Requires the head of each executive agency: (1) to determine the number of full-time agency employees on February 16, 2009 (2009 number) and the number of full-time agency employees on the date occurring 90 days after enactment of this Act (current number); (2) if the 2009 number is lower, to ensure that no new employee is appointed until the 2009 number is attained through attrition; and (3) if the current number is lower or once the 2009 number is attained, to maintain that number by offsetting each new appointment by a reduction. Excludes the Department of Defense (DOD), the Department of Homeland Security (DHS), the Executive Office of the President, the Central Intelligence Agency (CIA), the Federal Bureau of Investigation (FBI), and the Secret Service.

Requires the Secretary of Defense and the Secretary of Homeland Security to: (1) determine the current number of full-time employees of DOD and DHS; and (2) maintain that number by offsetting each new appointment by a reduction.

Requires the Director of the Office of Management and Budget (OMB) to: (1) publicly disclose the total number of federal employees, the number of federal employees in each agency, and the annual rate of pay by title of each federal employee at each agency; and (2) update such information at least once a year. Authorizes the Director of National Intelligence to exclude any employee from such information for purposes of national security.