Orinda, CA is seeing rapid growth and Orinda, CA's' housing market remains optimal with an average home price that is -100% below the 2023 national average. Orinda, CA is part of Contra Costa county and taxes are an important factor to consider when purchasing a home whether through rent to own or a traditional purchase. The average tax rate as of 2023 for county Contra Costa is 0.71% which is below the national average, which is 0.99%.