Harold N. Crowder, a Los Angeles Judicial District court commissioner, has been appointed a municipal judge by Gov. George Deukmejian. Crowder, 59, of La Canada, replaces Judge Nancy Brown, who was elevated to the Los Angeles County Superior Court. Crowder has been a court commissioner since 1974. He was previously in private practice and served as a police officer and later as a detective for the Los Angeles Police Department. Municipal Court judges are paid $66,449 annually.