More than half of all city voters oppose secession efforts by the San Fernando Valley and Hollywood, and support even among valley voters may be waning, according to a new poll released Wednesday.

Voters will decide Nov. 5 whether the two regions should break away from the city. The initiatives must win a majority of votes in the proposed new cities and also must be endorsed by a majority of voters citywide to make secession possible.

If the valley secedes, it would become the nation's sixth-largest city with about 1.3 million residents.

The survey, conducted for the Los Angeles Times, found that 56 percent of likely Los Angeles voters oppose valley secession, while 27 percent support it.

In the valley itself, 47 percent say they do not want a city breakup while 42 percent say they do. Eleven percent of valley voters are undecided.

The poll found that Hollywood secession is even less popular, with 60 percent of likely voters citywide opposing independence. Only 21 percent favored Hollywood secession.

The telephone survey reached 1,546 registered voters between Oct. 5 and Monday, and 970 identified themselves as likely to vote. The margin of sampling error for the overall city was plus or minus 2 percentage points; for registered or likely voters, it was 3 percentage points.