In the first census by the Palestinian Central Bureau of Statistics (PCBS) in 1997, Tulkarm had a population of 33,921 and the Tulkarm Refugee Camp had a population of 5,884. Palestinian refugees made up 31.4% of the city's residents and 94% of the camp's inhabitants. The sex ratio for the city was 50.7% male and 49.3% female. Over half (52.2%) of the city's population was under the age of 20, 44.5% were between the ages of 20 and 64 and 4.1% were over the age of 64. In the 2007 PCBS census Tulkarm's population grew to 51,300 while the camp's increased to 10,641. The sex ratio for the city was 50.3% male and 49.7% female.