According to conventional wisdom, it’s cheap to live out in the hinterlands, where property taxes are low and you can get more house for your money.
But with gasoline prices zooming towards $4 a gallon, the amount of money that Americans are spending on their cars is beginning to rival the amount of money they spend on their homes. Indeed, rising transportation costs have been a big contributing factor to households’ falling behind on their subprime mortgage payments.
A new tool from the Brookings Institution and Chicago’s Center for Neighborhood Technology maps out which neighborhoods are most affordable when transportation costs are taken into consideration (transportation costs were calculated from a combination of census data variables and geographic variables). These maps only cover major metropolitan areas, but luckily, they included little Portland, Maine as well (CNT also wrote the recent economic impacts report for the Downeaster, which may be why they included Portland in this study).
First, here’s a map of the greater Portland region. Based on the median household income of $44,707, the tan areas are places where housing costs take up less than 30% of the median household’s expenses - the conventional definition of affordability. The blue areas are neighborhoods where housing costs more than 30% of the median household’s income.

This map generally adheres to what most Mainers would expect - housing is expensive in the tony waterfront suburbs of Cape Elizabeth, Falmouth, and North Yarmouth, and also in the Lakes region. But housing is cheap in the inland suburbs of Buxton, Standish, and Gray.
Now here’s the same map with average transportation costs, based on census data, added in. Now the tan areas are places where housing PLUS transportation costs add up to less than 45% of the median household income. Blue areas are neighborhoods where housing and transportation costs add up to OVER 45% of household income.

In this view, most of the greater Portland area is unaffordable. The close-in neighborhoods in and surrounding the Portland peninsula are affordable, as well as the neighborhoods near downtown Westbrook, Old Orchard Beach, and downtown Freeport. Probably not coincidentally, fingers of affordability extend away from downtown Portland into North Deering, the Mall area, and Westbrook along the city’s bus lines.
These maps are interactive on the CNT website - you can dig deeper into the Portland region’s data by following this link. Clicking the “advanced” link in the upper-left corner of the mapping site will allow users to view more in-depth data on the census statistics behind the affordability calculations, including information on employment density, housing rents, and vehicle miles travelled per household.