Police carried out drugs raids at two houses in Bridlington and uncovered 80 wraps of crack cocaine and heroin.
Three people were arrested after the warrants were served on Tuesday morning.
Officers also found two ounces of cocaine and £1,000 in cash at the properties, and they seized mobile phones and drug equipment.
Investigation team leader Ian Dobson said: “This is a great result which is all thanks to the hard work of our officers, and has seen a large amount of drugs been taken off our streets.
“We will continue to work towards tackling the blight of drugs on our communities and the criminality that surrounds them.
“As we all know, drugs wreck families and lives and we are committed to removing them from the places where we live.
“Organised drugs groups like this who prey on vulnerable people and try and establish themselves in towns in our force area need to know that we will seek to find them and bring them to justice.
“We always encourage anyone who may have any information to contact us. Intelligence and information is essential to what we do.”