HP CC640WN cartridges are used in these printers:
HP DeskJet D-1660, HP DeskJet D-2500, HP DeskJet D-2500 Series, HP DeskJet D-2530, HP DeskJet D-2545, HP DeskJet D-2560, HP DeskJet D-2563, HP DeskJet D-2566, HP DeskJet D-2568, HP DeskJet D-2660, HP DeskJet D-2680, HP DeskJet F-2430, HP DeskJet F-2480, HP DeskJet F-4200, HP DeskJet F-4200 All In One, HP DeskJet F-4200 Series, HP DeskJet F-4210, HP DeskJet F-4213, HP DeskJet F-4230, HP DeskJet F-4235, HP DeskJet F-4240, HP DeskJet F-4250, HP DeskJet F-4272, HP DeskJet F-4273, HP DeskJet F-4274, HP DeskJet F-4275, HP DeskJet F-4280, HP DeskJet F-4283, HP DeskJet F-4288, HP DeskJet F-4292, HP DeskJet F-4293, HP DeskJet F-4400, HP DeskJet F-4400 Series, HP DeskJet F-4435, HP DeskJet F-4440, HP DeskJet F-4480, HP DeskJet F-4580, HP Envy 100 E All In One - D410A, HP Envy 100 E All In One - D410B, HP Envy 110 E All In One - D411A, HP Envy 110 E All In One - D411B, HP Envy 111 E All In One - D411D, HP Envy 114 E All In One - D411C, HP Envy 120 E-All In One, HP Envy 121 E-All In One, HP PhotoSmart C-4600, HP PhotoSmart C-4600 Series, HP PhotoSmart C-4610, HP PhotoSmart C-4635, HP PhotoSmart C-4640, HP PhotoSmart C-4650, HP PhotoSmart C-4670, HP PhotoSmart C-4673, HP PhotoSmart C-4680, HP PhotoSmart C-4683, HP PhotoSmart C-4685, HP PhotoSmart C-4688, HP PhotoSmart C-4700, HP PhotoSmart C-4700 Series, HP PhotoSmart C-4740, HP PhotoSmart C-4750, HP PhotoSmart C-4780, HP PhotoSmart C-4783, HP PhotoSmart C-4785, HP PhotoSmart C-4788, HP PhotoSmart C-4793, HP PhotoSmart C-4795, HP PhotoSmart C-4798, HP PhotoSmart C-4799, HP PhotoSmart e All In One D-110, HP PhotoSmart e-All-In-One, HP PhotoSmart e-All-In-One D110A,