10 most unaffordable US cities: Los Angeles tops list, four in California, per Creditnews Research.

10 most unaffordable US cities: Los Angeles tops list, four in California, per Creditnews Research. Study ranks populous US cities by % of neighborhoods affordable for average married couple. Affordability measured using median income of married households vs typical home value in each neighborhood, with areas deemed unaffordable if monthly mortgage payment is over 25% of couple's income.