All federal, state, county and city offices and most banks will be closed Monday for the Martin Luther King Jr. Day holiday. Post offices will be closed and there will be no delivery of regular mail. Amador County Schools are closed for the day. Most retail and service businesses stay open for the holiday. The holiday has affected some scheduled meetings: The Board of Supervisors and Sutter Creek City Council meetings are cancelled this week, and the Jackson Planning Commission meeting has been moved to Tuesday night.