Title: Kuantim mi tu (‘Count me too’): using multiple methods to estimate the number of female sex workers, men who have sex with men and transgender women in Papua New Guinea in 2016 and 2017. Authors: Damian Weikum, MPH 1 , Angela Kelly-Hanku, PhD, 2,3 , Parker Hou 3 , Martha Kupul, BS 3 , Angelyne Amos- Kuma, MIPH 3 , Steven G Badman, MPH JP PhD (Candidate) 2 , Nick Dala MBBS MMed 4 , Kelsey C. Coy, MPH 1 , John M Kaldor, MPH 2 , Andrew J Vallely MBBS MRCP DTMH MSc DLSHTM PhD 2 , and Avi J Hakim, MA MPH 1 on behalf of the Kauntim mi tu Study Team Affiliations: 1 US Centers for Disease Control and Prevention 2 Kirby Institute, UNSW Sydney 3 Papua New Guinea Institute of Medical Research 4 Papua New Guinea National Department of Health Address correspondence to: Damian Weikum 1600 Clifton Rd, NE Mail Stop E-30 Atlanta, GA 30329 404.718.5688 ndi9@cdc.gov Disclaimer: The findings and conclusions in this report are those of the authors and do not necessarily represent the official position of the funding agencies. Funding: This project has been supported by the Government of Australia, the Global Fund to Fight AIDS, TB and Malaria, and in part by the President’s Emergency Plan for AIDS Relief (PEPFAR) through the Centers for Disease Control and Prevention (CDC) (Cooperative Agreement No.: U2GGH001531 (award no. – 01531GH15)) to Cardno. This publication was also supported by CDC Cooperative Agreement No.: NU2GGH002093-01-00 to the Public Health Institute. Key words: Papua New Guinea, population size estimation, female sex workers, men who have sex with men, transgender women, key populations, respondent-driven sampling, unique object multiplier, service multiplier, successive sampling (10 OUT OF 10 ALLOWED) Study design: This survey employed respondent-driven sampling, unique object multiplier, service multiplier, and successive sampling methodologies. Word count: Abstract: 380 OUT OF 450 ALLOWED Main text: 2925 OUT OF 3000 ALLOWED Number of tables: 3 Number of figures: 0 1