Seabrook cost of living score 120.8 More expensive 20.8% higher than the US average 8.1% higher than the Maryland average Seabrook (zip 20706), Maryland gets a BestPlaces Cost of Living score of 120.8, which means the total cost of housing, food, childcare, transportation, healthcare, taxes, and other necessities is 20.8% higher than the U.S. average and 8.1% lower than the average for Maryland.