Office of Financial Management
Link to OFM website survey.

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April 1 official population estimates

RCW 43.62.030 states that the Office of Financial Management (OFM) shall annually determine the April 1 populations of all cities and towns of the state.  OFM population estimates for cities and towns are used in state program administration and in the allocation of selected state revenues (RCW 43.62.020).  Population estimates for counties are used to allocate revenues as specified in RCW 36.13.100
and RCW 43.62.030.

April 1, 2017 press release and data products

April 1, 2016