Authorities say at least 176 people have now died in flooding that began in August and has continued across the country.
Observers say some of the lists have the same name twice, while some retain “ghost” names of inexistent people.
The teachers, from 18 provinces, gathered at Freedom Park in the capital, the only sanctioned space for such demonstrations.
Oxfam America said in a statement that government and relief agency responses are under way, but more assistance is necessary.
Since 2007, the program has placed 227 people in 14 provinces around Cambodia.
Sophiline Cheam Shapiro says show is about the abuse of power and is a mythic representation of some of Cambodia’s modern woe.
Officials are still gauging the damage to infrastructure and rice fields, in the worst flooding since 2000.
The National Elections Committee says it has registered an estimated 460,000 out of more than 470,000 expected new voters.
The flooding has affected 90,000 families across 14 provinces, killing at least 34 children and destroying some 200 homes.
“Cambodia’s Hidden Scars” delves into the trauma caused to the Cambodian population by the Khmer Rouge, even today.
Hepatitis C is one of three forms of the disease.
The center began 15 years ago, as a way to help treat Cambodians who could not afford expensive care or medicine.
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