An overview of the general cost of living index for Trenton, MO is displayed above for your reference. Residents in Trenton, MO enjoy a cost of living index of 82. This index is 10% lower than the Missouri average, and 18% lower 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 Trenton, MO, the average cost of goods and services is 5% higher than it is in Missouri, and it is 3% higher than the national average.