In an attempt to estimate the size of the New York City methamphetamine using population, we have developed a net- work-based variant of standard capture-recapture methods that is capable of estimating the total size of a hidden, networked population from a network sample of current users, even while maintaining respondent anonymity. The proposed method re- quires sampling from each respondent’s network connections, and matching these connections against both the other respon- dents in the sample and the list of their respective contacts. Such methods are not particularly complex,