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We describe temporal and regional variation in PD supply among Medicare-certified dialysis facilities from 2006 to 2013. The average proportion of facilities supplying PD per hospital referral region increased from 40% (2006) to 43% (2013). PD supply had been highest in hospital referral regions with higher percentage of services in urban areas (p = .004), prevalence of PD use (p less then .0001), percentage of White end-stage renal disease patients (p = .02), and