The rotation of all 26 seats is determined by the amount of money candidates paid during the election campaign in 2008.
The residents of the neighborhood, known as Dey Krahorm, called for Prime Minister Hun Sen to step down from power.
They are charged with atrocity crimes, including genocide, with a trial expected later this year.
Hun Sen was referring to the ongoing social upheaval in the North African country that toppled a longtime authoritarian president.
Arbitration Council President Kong Phallack said the lower number was due to the closure of factories in the wake of the 2008 crisis.
Tribunal spokesman Lars Olsen said the Trial Chamber will consider the request as planning for the trial moves ahead.
The four police officials were arrested for corruption in connection with drug trafficking.
Hun Sen was responding to concerns raised by the US lawmakers as the refugee center nears its closing date, Feb. 15.
The rangers work for the Ministry of Environment, supported by Fauna and Flora International.
Yoeung Baloung, a former police chief of Ratanakkiri province, was supposed to be in jail on charges related to illegal logging.
Officials would like to see 87 million visitors traveling across Southeast Asia by 2015.
The decision overruled a ruling by the Phnom Penh Municipal Court last week to hold five of seven Thais arrested in December.