An overview of the general cost of living index for Duvall, WA is displayed above for your reference. Residents in Duvall, WA enjoy a cost of living index of 138. This index is 23% higher than the Washington average, and 38% higher than the national average. The following categories are used when determining the cost of living index for any given city: health care (5%), transportation (9%), utilities (10%), groceries (13%), housing (30%), and goods/services (33%). Clearly, housing and goods/services make up the majority of the formula for calculating the cost of living index. Because of this, the general cost of living for any given area can be estimated by looking at the cost of everyday goods in that area. For those living in Duvall, WA, the average cost of goods and services is 10% higher than it is in Washington, and it is 14% higher than the national average.