An overview of the general cost of living index for Portland, CT is displayed above for your reference. Residents in Portland, CT enjoy a cost of living index of 121. This index is 5% lower than the Connecticut average, and 21% 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 Portland, CT, the average cost of goods and services is 1% lower than it is in Connecticut, and it is 20% higher than the national average.