Nomination papers  for residents interested in running for office in the annual  town election  are available at the town clerk’s office. There are seven seats on the May 13 ballot; for a complete list of available positions, visit www.town.northborough.ma.us.  The deadline to return nomination papers is March 25.  For more information, call the clerk’s office at 508-393-5001, or e-mail townclerk@town.northborough.ma.us.